Technical Abbreviations

Look through 1745 acronyms and abbreviations related to Technical:

2.5G	Enhanced second generation cellular
2G	Second generation cellular
3G	Third Generation mobile phone network
3GPP IMS	Third Generation Partnership Project Internet Multimedia System
3PCC	Third Party Call Control
4G	4th Generation Mobile network
4rd	IPv4 Residual Deployment
6CO	6LoWPAN Context Option
6LBR	6LoWPAN Border Router
6LN	6LoWPAN Node
6LoWPANs	IPv6 over Low-Power Wireless Personal Area Networks
6LR	6LoWPAN Router
6LSA	IPv6 Label Switching Architecture
6PE	IPv6 Provider Edge
6rd	IPv6 Rapid Deployment on IPv4 Infrastructures
6to4-PMT	6to4 Provider Managed Tunnel
A P	Address plus Port
AAA	authentication, authorization, and accounting
AAC	Advanced Audio Coding
AAD	Additional Authenticated Data
AAH	Abandoning All Hope
AAK	Authenticated Anticipatory Keying
AAL5	ATM Adaptation Layer 5
ABI	Application Binary Interface
ABNF	Augmented Backus-Naur Form
ABR	Area Border Router
ABRO	Authoritative Border Router Option
AC	Attachment Circuit
AC	Access Control
ACAP	Application Configuration Access Protocol
ACARS	Aircraft Communications Addressing and Reporting System
ACCAS	Altocumulus Castellanus
ACE	Access Control Entry
ACH	Associated Channel Header
ACK	No Expansion
ACL	Access Control List
ad	Authentic Data
ADISC	Address Discovery Extended Link Service
ADM	Add-Drop Multiplexer
ADS	Astrophysics Data System
ADSL	Asymmetric Digital Subscriber Line
ADSP	Author Domain Signing Practices
ADU	Application Data Unit
AEAD	Authenticated Encryption with Associated Data
AES	Advanced Encryption Standard
AF	Assured Forwarding
afbr	Address Family Border Routers
AFI	Address Family Identifier
AfriNIC	African Network Information Center
AFS	Authentication File System

AFTR	Address Family Transition Router
AH	Authentication Header
AHS	Additional Header Segment
AHS	Adaptive HTTP Streaming
AIA	Authority Information Access
AIMD	Additive Increase, Multiplicative Decrease
AIS	Alarm Indication Signal
AKA	Authentication and Key Agreement
AKM	Authentication and Key Management
ALC	Asynchronous Layered Coding
ALG	Application Layer Gateway
ALOC	Area Locator
ALT	Alternative Logical Topology
ALTO	Application-Layer Traffic Optimization
AMDAR	Aircraft Meteorological Data Relay
AMEI	Association of Musical Electronics Industry
AMI	Advanced Metering Infrastructure
AMID	Additive Increase Multiplicative Decrease
AMR	An Adaptive Multi Rate
AMR-NB	Adaptive Multi Rate - NarrowBand
AMR-WB	Adaptive Multi-Rate Wideband
AMS	authoritative mapping server
AMSS	Advanced Mobile Station Software
ANAT	Alternative Network Address Types
ANDSF	Access Network Discovery and Selection Function
ang	Access Network Gateway
ANSI	American National Standards Institute, Inc.
AOA	At or Above
AOB	At or Below
AOR	Address of Record
AP	access point
API	Application Programming Interface
APM	Application Performance Measurement
APN	An Access Point Name
APNIC	Asia Pacific Network Information Centre
APP	Application-specific functions
AQM	Active Queue Management
AR	Access Router
AR	Address Resolution
ARF	Abuse Reporting Format
ARIN	American Registry for Internet Numbers
ARKLAMISS	ARKansas / LouisianA /MISSissippi region
ARKLATEX	ARKansas / LouisianA / TEXas region
ARMv4	Advanced RISC Machine version 4
ARO	Address Registration Option
ARO	Access Router Option
ARP	Address Resolution Protocol (ATM)
ARQ	Automatic Repeat-reQuest
AS	Authentication Service
as	Application Specification

AS	Applicability Statement
AS	Autonomous System
ASBR	Autonomous System Border Router
ASCII	American National Standard Code for Information Interchange
ASE	Autonomous System External
ASE	amplifier spontaneous emission
ASIC	Application Specific Integrated Circuit
ASM	Any-Source Multicast
ASM	address-sharing mechanism
ASN	Autonomous System Number
ASN	Access Service Network
ASN.1	Abstract Syntax Notation One
ASNGW	Access Service Network Gateway
ASON	Automatically Switched Optical Network
ASOS	Automated Surface Observing System
ASP	Application Service Provider
ASR	Automatic Speech Recognition
ATA	Analog Telephone Adaptor
ATD	Activation Time Delay
ATM	Automatic Teller Machine
ATM	Asynchronous Transfer Mode
ATTM	At This Time
ATU	ADSL Transceiver Unit
AU	Audio Unit
AUID	Agent or User Identifier
AVA	Attribute Value Assertion
AVP	Attribute-Value Pair
avp	Audio-visual Profile
avpf	Audio-Visual Profile with Feedback
AVT	Audio/Video Transport
AWIPS	Advanced weather Interactive Processing System (NOAA)
AWOS	Automated Weather Observation System
AXFR	Asynchronous Full Transfer
B-ISDN	Broadband Integrated Services Digital Network
B2BUA	Back-To-Back User Agent
B4	Basic Bridging BroadBand
BAB	Bundle Authentication Block
BACP	Bonding Aggregation Control Protocol
BACP	Bandwidth Allocation Control Protocol
BB	Bottleneck Bandwidth
BCC	Bonding Communication Channel
bce	Bonding Channel Entity
BCH	Bose, Ray-Chaudhuri, Hocquenghem
BCP	Bridging Control Protocol
BCP	Best Current Practice
BDP	Bandwidth-Delay Product
BECN	Backward Explicit Congestion Notification
BEEP	Blocks Extensible Exchange Protocol
BEK	bundle encryption key
BER	Bit-Error Rate

BER	Basic Encoding Rules (ASN.1)
BFCP	Binary Floor Control Protocol
BFD	Bidirectional Forwarding Detection
BGP	Border Gateway Protocol (routing protocol)
BIA	Bump-in-the-API
bih	Bump-in-the-Host
BIS	Bump-in-the-Stack
BN	Bundle Node
BNF	Backus-Naur Form (computing)
BNG	Broadband Network Gateway
BOF	Birds of a Feather
BPDU	Bridge PDU
BR	Border Router
BRAS	Broadband Remote Access Server
BRDP	Border Router Discovery Protocol
BRI	Basic Rate Interface
BRN	Bulk Richardson Number
BRPC	Backward Recursive PCE-Based Computation
BS	Base Station
BSC	Base Station Controller
BSM	Bootstrap Message
BSO	Basic Security Option
BSP	Bundle Security Protocol
BSR	Bootstrap Router
BSSID	Basic Service Set Identifier
btmm	Back to My Mac
BTS	Base Tranceiver Station
BTU	Bonding Transmission Unit
BW	Bandwidth
BWER	Bounded Weak-Echo Region
CA	Certificate Authority
CA	cryptographic authentication
CAA	Cold Air Advection
caa	Certification Authority Authorization
cab	Converged Address Book
CAC	Connection Admission Control (Asynchronous Transfer Mode)
CAdES	CMS Advanced Electronic Signatures
CalDAV	Calendaring Extensions to WebDAV
CALS	Computer-Aided Acquisition and Life-Cycle Support
CAM	Content Addressable Memory
CAP	Candidate Access Point
CAPE	Convective Available Potential Energy
CAPTCHA	Completely Automated Public Turing test to tell Computers and Humans Apart
CAPWAP	Control and Provisioning of Wireless Access Points
CAR	committed access rate
CARD	Candidate Access Router Discovery
CATNIP	Common Architecture for Next Generation Internet Protocol
CAVE	Cellular Authentication and Voice Encryption Algorithm
CB	Cumulonimbus
CBC	cipher block chaining

CBC-MAC	Cipher Block Chaining Message Authentication Code
CBID	Crypto-Based Identifier
CBR	Constant Bitrate
cc	Call Completion
CC-V	Continuity Check and Connectivity Verification
CCE	Call-Completion Entity
CCID	Congestion Control Identifier
CCID	Content Collection IDentifier
CCM	Codec Control Messages
CCMP	Counter Mode with CBC-MAC Protocol
CCNL	Call Completion on Not Logged-in
CCNR	Call Completion on No Reply
ccTLD	country code Top Level Domain
CCXML	Call Control XML
CDF	Cumulative Distribution Function
CDF	Comma-Delimited Format or
CDMA	Code Division Multiple Access (voice/data transmission)
CDMI	Cloud Data Management Interface
CDN	Content Delivery Network
CDN	Call-Disconnect-Notify
CDN	Content Distribution Network
CDNI	Content Distribution Network Interconnection
CDP	Content Delivery Protocol
CDR	Call Data Record
CE	Control Element
CE	Congestion Experienced
CE	Customer Edge (IETF RFC 2547)
CEID	Control Element ID
CEK	content-encryption key
CELP	code-excited linear prediction
CEMA	Connection Establishment for Media Anchoring
CEP	Circuit Emulation over Packet
CERT	Computer Emergency Response Team
ces	Core-Edge Separation
CES	Circuit Emulation Service
CESoPSN	Circuit Emulation Service over Packet Switched Network
CFB	Cipher Feedback
CFWS	comments and folding white space
CGA	Cryptographically Generated Addresses
CGI	Common Gateway Interface
CGN	Carrier-Grade NAT
CHAP	Challenge Handshake Authentication Protocol (ATM)
CHbH	Critical Hop-by-Hop
CIA	Confidentiality, Integrity and Availability
CID	Carousel Instance Descriptor
CID	Content Identifier
CID	Context Identifier
CID	Connection Identifier
CIDR	Classless Inter-Domain Routing (ATM)
CIID	Carousel Instance IDentifier

CIN	Convective Inhibition
CIPID	Contact Information in PIDF
CIPSO	Common Internet Protocol Security Option
CIS	Cryptographic Interoperability Strategy (US NSA)
CISC	Complex Instruction Set Computer
CIST	Common and Internal Spanning Tree
CItE	Critical Ingress-to-Egress
CLDR	Common Locale Data Repository
CLDR	Connectionless Data Response
CLEI	Common Language Equipment Identifier
CLI	Calling Line Identification
CLI	Command line Interface (Cabletron)
CLNS	Connectionless Network Service
CLP	Cell Loss Priority (ATM)
cmac	Cipher-based Message Authentication Code
CMC	Certificate Management over CMS
CMCC	Conference and Media Control Client
CMS	Cryptographic Message Syntax
CMTS	Cable Modem Termination System
CN	Correspondent Node
CN	Common Name
CN	Client Node
CNF	Cache-and-Forward
CNG	comfort noise generation
CO	Central Office
COA	Care-Of Address
CoA	Change-of-Authorization
COM	Component Object Module
COMEDIA	Connection-Oriented Media
CONS	Content distribution Overlay Network Service
CONUS	Continental United States (48 Contiguous States and DC)
COPS	Common Open Policy Service
CORBA	Common Object Request Broker Architecture
CORS	Cross-Origin Resource Sharing
COS	Class Of Service
cot	Care-of Test
CoTI	Care-of Test Init
CP	Certificate Policy
CPA	Certification Path Advertisement
CPE	Customer Premises Equipment
CPIM	Common Presence and Instant Messaging
CPL	Call Processing Language
CPP	Common Profile for Presence
CPS	Certification Practices Statement
CPS	Certification Path Solicitation
CPU	Central Processing Unit
cr	Correspondent Router
CR	Carriage Return
CR-LDP	Constraint-based Routed Label Distribution Protocol
CRC	Contrôle de Redondance Cyclique (French: Cyclic Redundancy Check)

CRIO	Core Router-Integrated Overlay
CRISP	Cross Registry Internet Service Protocol
CRL	Certificate Revocation List
CRLF	Carriage-Return Line-Feed
CRMF	Certificate Request Message Format
CRS	Coordinate Reference Systems
cRTP	compressed RTP
CSAIL	Computer Science & Artificial Intelligence Laboratory
CSI	Conditional Symmetric Instability
CSIRT	Computer Security Incident Response Team
CSMA/CD	Carrier Sense Multiple Access with Collision Detection
CSNP	Complete Sequence Number PDU
CSP	Content Service Provider
CSPF	Constrained Shortest Path First
CSRC	Contributing Source
CSRF	Cross-Site Request Forgery
CTM	Cellular Text Telephone Modem
CTO	Congestion Timeout
CTR	Counter Mode
CTS	Clear To Send
CT_IU	Common Transport Information Unit
CU	CUmulus cloud
CUG	Closed User Group
CW	Control Word
DA	Datamover Architecture
DA	Destination Address
DAC	Duplicate Address Confirmation
DAC	Dynamic Authorization Client
DAD	Duplicate Address Detection
DAG	directed acyclic graph
DANE	DNS-Based Authentication of Named Entities
DAO	Destination Advertisement Object
DAR	Dynamic Alternate Routing
DAR	Duplicate Address Request
DARPA	Defense Advanced Research Projects Agency (US)
DASH	Dynamic Adaptive Streaming over HTTP
DASS2	Digital Access Signaling System 2
DBA	Dynamic Bandwidth Allocation
DCCP	Datagram Congestion Control Protocol
DCE	Distributed Computing Environment
DCE	Data Communication Equipment
DCOM	Distributed Component Object Model
dct	Discrete Cosine Transformer
DCVA	Differential Cyclonic Vorticity Advection (meteorology)
DD	Database Description
DDDS	Dynamic Delegation Discovery System
DDNS	Dynamic DNS
DDOS	Distributed Denial of Service
ddp	Device Discovery Protocol
DDUL	Dynamic DNS Update Lease

DE	Discard Eligible
DECADE	DECoupled Application Data Enroute
DELMARVA	DELaware / MARyland / VirginiA region
DELT	Dual Ended Loop Test
DER	Distinguished Encoding Rules
DES	Data Encryption Standard
DF	Don't Fragment
DFZ	Default-Free Zone
DGIWG	Defence Geospatial Information Working Group
DHAAD	Dynamic Home Agent Address Discovery
DHCP	Dynamic Host Configuration Protocol
DHCPv6	Dynamic Host Configuration Protocol for IPv6
DID	direct inward dial
DIFS	Distributed Interframe Space
DIO	DODAG Information Object
DIS	DODAG Information Solicitation
DIT	Directory Information Tree
DKIM	DomainKeys Identified Mail
DLCI	data link connection identifier
DLSW	Data Link Switching
DLV	DNSSEC Lookaside Validation
DN	Distinguished Name
DNA	Detecting Network Attachment
DNS	Domain Name System
DNS-SD	DNS-based Service Discovery
DNSSEC	DNS Security
DNT	Do Not Track
DOCSIS	Data over Cable Service Interface Specification
DODAG	Destination-Oriented Directed Acyclic Graph
DOI	Domain Of Interpretation
DOM	Document Object Model
DOS	Denial Of Service
DP	Distribution Point
dp	Data Plane
dpa	Destination Preference Attribute
DPI	Deep Packet Inspection
DPNSS	Digital Private Network Signaling System
DPS	Domain Pseudonym System
dps	Distributed Programming System
DPVA	Differential Positive Vorticity Advection
DR	Designated Router (networking)
DRB	Designated RBridge
DRBG	deterministic random-bit generator
DRM	Digital Rights Management
DRO	Discovery Reply Object
DRS	DGIWG Registry System
DS	Delegation Signer
DS	Differentiated Services
DS-Lite	Dual-Stack Lite
DSA	Digital Signature Algorithm

DSACK	Duplicate Selective Acknowledgement
DSAP	Destination Service Access Point
DSCP	Differentiated Services Code Point
DSDL	Document Schema Definition Languages
DSE	DSA-Specific Entry
DSL	Digital Subscriber Line
DSLAM	Digital Subscriber Line Access Multiplexer (Module)
DSM	demand-side management
DSN	Delivery Status Notification
DSP	Digital Signal Processor
DSRK	Domain-Specific Root Key
DSS	Digital Signature Standard
DSUSRK	Domain-Specific Usage-Specific Root Keys
DTD	Document Type Definition (XML)
DTD	Deactivation Time Delay
DTE	Data Terminal Equipment
DTLS	Datagram Transport Layer Security
DTMF	Dual-Tone MultiFrequency
DTN	Delay-Tolerant Networking
DTS	Decode Time Stamp
DTSN	Destination Advertisement Trigger Sequence Number
DTX	Discontinuous Transmission
DUA	DASS 2 Extensions
DUID	DHCP unique identifier
DUNS	Data Universal Numbering System
DUT	Device Under Test
DVB	Digital Video Broadcasting
DVI	No Expansion
DVMRP	Distance Vector Multicast Routing Protocol
DWDM	Dense Wavelength Division Multiplexing
E-LINE	Ethernet point-to-point connectivity
E-LSP	Explicitly TC-encoded-PSC LSP
E-VLAN	Ethernet Virtual Private LAN
EAP	Extensible Authentication Protocol
EAP-GSPK	Extensible Authentication Protocol - Generalized Pre-Shared Key
EAP-TTLS	Extensible Authentication Protocol-Tunneled Transport Layer Security
EBCDIC	Extended Binary Coded Decimal Interchange Code (pronounced Eb-see-dik) (cf. BCD)
EBGP	External Border Gateway Protocol
EBM	Equipped Bit Mask
EC	Elliptic Curve
EC2N	Elliptic Curve Group Over GF(2^N)
ECAM	European Committee for Academic Middleware
ECC	Elliptic Curve Cryptography
ECC CDH	Elliptic Curve Cryptography Cofactor Diffie-Hellman
ECCSI	Elliptic Curve-Based Certificateless Signatures for Identity-Based Encryption
ECDH	Elliptic Curve Diffie-Hellman
ECDSA	Elliptic Curve Digital Signature Algorithm
ECM	Error Correction Model
ECMP	Equal-Cost Multipath
ECMP	Electronic Commerce Messaging Protocol

ECMWF	European Centre for Medium-Range Weather Forecasts model
ECN	Explicit Congestion Notification
ECP	Elliptic Curve Group over GF[P]
ECP	Electronic CodeBook
ECP	Encryption Control Protocol
ECRTP	Enhanced Compressed RTP
ECT	ECN-Capable Transport
EDCA	Enhanced Distributed Channel Access
EDF	Empirical Distribution Function
EDGE	Enhanced Data Rates for GSM Evolution
EDI	Electronic Data Interchange
EDIINT	Electronic Data Interchange Internet Integration
EDNS	Extension Mechanisms for DNS
EE	End Entity
EF	Expedited Forwarding
EFCI	Explicit Forward Congestion Indication (ATM)
EFM	Ethernet First Mile
EFR	Enhanced Full Rate
EGP	Exterior Gateway Protocol
EHI	Energy Helicity Index
EHLO	Extended Hello
EID	Endpoint Identifier
EIP	Extended Internet Protocol
EIRP	Equivalent Isotropic Radiated Power
EISS	Extended Internal Sublayer Service
EKU	Extended Key Usage
EL	Equilibrium Level
ELOC	Endpoint Locator
ELY	EasterLY
EMA	External Measurement Agent
EML	Elevated Mixed Layer
EMS	Energy Management Systems
EMSK	Extended Master Session Key
eNB	Evolved Node B
ENUM	No Expansion
EOF	Extended Options and Flags
EOF	End Of File
EOR	Exclusive OR
ePC	Electronic Product Code
EPC	Evolved Packet Core
EPI	Educational Policy Institute
EPON	Ethernet Passive Optical Network
EPP	Extensible Provisioning Protocol
EPS	Evolved Packet System
EPUB	Electronic Publication
ER	EAP Re-authentication
ERE	Extended Regular Expressions
ERN	Eastern
ERO	Explicit Route Object
ERP	Enterprise Resource Provision

ERP	EAP Re-authentication Protocol
ERT	Expected Residual Time
ERU	Effective Request URI
ERX	EAP Re-authentication Extension
ES	Errored Second
ESADI	End-Station Address Distribution Information
ESB	Extension Security Block
ESI	Energy Services Interface
ESI	Entity Status Inquiry
ESI	Error Source Identifier
ESI	Encoding Symbol ID
ESMTP	Extended Simple Mail Transfer Protocol
ESN	Extended Sequence Number
ESN	Electronic Serial Number
ESO	Extended Security Option
ESP	Encapsulating Security Payload
esrp	Emergency Service Routing Proxy
ESS	Extended service set (Wi-Fi group)
ETR	Egress Tunnel Router
ETS	Emergency Telecommunications Service
ETX	Expected Transmission Count
EUI	Extended Unique Identifier
EVDO	Evolution-Data Optimized
EVRC	Enhanced Variable Rate Codec
EVRC-NW	Enhanced Variable Rate Narrowband-Wideband Codec
EVS	Extended-Vendor-Specific
EWMA	Exponentially Weighted Moving Average
FA	Foreign Agent
FA	forwarding adjacency
FAD	feature and attribute data
FAN ELS	Fabric Address Notification Extended Link Service
FARP	Fibre Channel Address Resolution Protocol
FBL	Feedback Loop
FCAPS	Fault, Configuration, Accounting, Performance, and Security
FCFS	First Come First Served
FCI	Feedback Control Information
FCIP	Fibre Channel Over TCP/IP
FCP	Fibre Channel Protocol
FCS	Frame check sequence (Ethernet)
FDB	Filtering Database
FDDI	Fiber Distributed Data Interface
FDT	File Delivery Table
FE	Forwarding Element
FEC	Forward Error Correction
FEC	Forwarding Equivalence Class
FECN	Forward Explicit Congestion Notification (ATM)
FF	Fixed-Filter
FFD	Full Function Device
FFS	For Further Study
FFT	Fast Fourier Transform

FG	forest guide
FI	Forwarding Indicator
FIA	Form Interpretation Algorithm
FIB	Forwarding Information Base
FID	Flow ID
FIFO	First In, First Out
FII	Forked Instance Identifier
FIN	Not expanded
FLUTE	File Delivery Over Unidirectional Transport
FMIPv6	Fast Handovers for Mobile IPv6
FMT	feedback message type
FORCES	Forwarding and Control Element Separation Working Group
FPGA	Field-Programmable Gate Array
FPS	Frames per second.
FQDN	Fully Qualified Domain Name
FR	Frame Relay
FRAND	fair, reasonable, and non-discriminatory
FROPA	Frontal Passage
FRR	Fast Reroute
FRZLVL	FReeZing LeVeL
FSM	Finite State Machine
FSPF	Fabric Shortest Path First
FSSI	FEC-Scheme-Specific Information
ft	Feedback Target
FTN	FEC-to-NHLFE
FTP	File Transfer Protocol
FTTH	Fiber To The Home
FWS	Folding White Space
G-ACh	Generic Associated Channel
GAL	Generic Associated Channel Label
GARP	Generic Attribute Registration Protocol
GAS	Generic Advertisement Service
GbE	Gigabit Ethernet
GBS	Generic Bonding Sub-layer
GCKS	Group Controller/Key Server
GCM	Galois/Counter Mode
GCO	Global Concurrent Optimization
GDOI	Group Domain of Interpretation
GEFS	Global Ensemble Forecast System
GERAN	GSM/Edge Radio Access Network
GFP	Generic Framing Procedure
GFS	Global Forecast System
GGSN	Gateway GPRS Support Node
GIST	General Internet Signaling Transport
GLB	Global Locator Block
GLOP	No Expansion
GMAC	Galois Message Authentication Code
GMII	Gigabit Media Independent Interface
GML	Geography Markup Language
GMPLS	Generalized Multiprotocol Label Switching

GMRP	GARP Multicast Registration Protocol
GMT	Greenwich Mean Time (Zulu)
GNSS	Global Navigation Satellite System
GOES	Geostationary Operational Environmental Satellite
GPL	General Public License
GPMD	General-Purpose Media Descriptor
GPRS	General Packet Radio Service
GPS	Global Positioning System (ex-NAVSTAR)
GPU	Graphics Processing Unit
GRE	Generic Routing Encapsulation
GRUU	Globally Routable User Agent URI
GSAKMP	Group Secure Association Key Management Protocol
GSE	Generalized Structure Elements
GSI	Grid Security Infrastructure
GSLB	Global Server Load Balancing
GSM	Global System for Mobile Communications
gspd	Group Security Policy Database
GSPM	Generic Secure Password Method
GSS-API	Generic Security Service Application Program Interface
GSTN	General Switched Telephone Network
GTK	Group Temporal Key
gTLD	Generic Top-Level Domain
GTP	Generic Tunneling Protocol
GTSM	Generalized TTL Security Mechanism
GUI	Graphical User Interface (goo-ey)
GUID	Globally Unique Identifier
GVRP	Generic VLAN Registration Protocol
HA	Home Agent
HAC	Home Agen Controller
HAS	HTTP Adaptive Streaming
HBA	Host Bus Adapter
HBA	Host-Based Authentication
HBA	Hash-Based Addresses
HC	High Capacity
HDLC	High-Level Data Link Control
HELD	HTTP-Enabled Location Delivery
HET	Header Extension Type
HFC	Hybrid Fiber Coaxial
HG	Home Gateway
HIP	Host Identity Protocol
hIPv4	hierarchical IPv4
HIT	Host Identity Tag
HKDF	HMAC-based Key Derivation Function
HLR	Home Location Register
HMAC	Hash-Based Message Authentication Code
HMIPv6	Hierarchical Mobile IPv6
HoA	Home Address
HOKEY	Handover Keying
HoT	Home Test
HoTI	Home Test Init

HPC	Hydrometeorological Prediction Center
HPTP	HTTP-based Peer to Peer
HRRR	High-Resolution Rapid Refresh model
HSM	Hardware Security Module
HSPA	High-Speed Packet Access
HSS	Home Subscriber Server
HSTS	HTTP Strict Transport Security
HTML	Hyptertext Markup Language
HTTP	Hypertext Transfer Protocol
https	HyperText Transfer Protocol Secure
I-D	Internet-Draft
IA-RWA	Impairment-Aware Routing and Wavelength Assignment
IAB	Internet Architecture Board
IAID	Identity Association IDentifier
IAMM	In-line Aware MRB Mode
IANA	Internet Assigned Numbers Authority
IAP	Intermediate Anonymization Process
IAP	Intercept Access Point
IAP	Internet Access Provider
IAX	Inter-Asterisk Exchange
IA_PD	Identity Association for Prefix Delegation
IBAKE	Identity-Based Authenticated Key Exchange
IBCF	Interconnection Border Control Function
IBE	Identity-Based Encryption
iBGP	Internal BGP
ICC	ITU-T Carrier Code
ICE	Interactive Connectivity Establishment
ICMP	Internet Control Message Protocol
ICP	Internet Content Provider
ICRP	Incoming-Call-Reply
ICRQ	Incoming-Call-Request
ICSA	International Computer Security Association
ICV	Integrity Check Value
IDEA	International Data Encryption Algorithm
IDN	Internationalized Domain Name
IDNA	Internationalizing Domain Names in Applications
IdP	Identity provider
IDRP	Inter-Domain Routing Protocol (ATM)
IDS	Intrusion Detection System
IE	Information Element
IEC	International Electronical Commission
IESG	Internet Engineering Steering Group
IETF	Internet Engineering Task Force
IF	Intermediate Frequency
IFF	If and Only If
IFG	Inter-Frame Gap
IGD	Internet Gateway Device
IGMP	Internet Group Management Protocol
IGP	Interior Gateway Protocol
IHL	Internet Header Length

IID	Instance Identifier
IID	Interface Identifier
IIH	Is-Is Hello
IKE	Internet Key Exchange
IKEv2	Internet Key Exchange Protocol Version 2
ILM	Incoming Label Mapping
ILMI	Integrated Local Management Interface
ILNP	Identifier-Locator Network Protocol
ILV	Index-Length-Value
IMA	Inverse Multiplexing for ATM
IMAP	Internet Message Access Protocol
IMEI	International Mobile Equipment Identity
iMIP	iCalendar Message-Based Interoperability Protocol
IMPP	Instant Messaging and Presence Protocol
IMS	IP Multimedia Subsystems
IMSI	International Mobile Subscriber Identity
INCITS	International Committee for Information Technology Standards
INVOF	In vicinity of
IO	Information Object
IOI	Item of Interest
ION	IETF Operational Notes
IOS	Internetwork Operating System
IP	Internet Protocol
IPBX	IP Private Branch Exchange
IPCP	IP Control Protocol
IPDV	IP Packet Delay Variation
Ipfix	Ip Flow Information Export
IPFRR	IP Fast Reroute
IPHC	IP Header Compression
IPP	Internet Printing Protocol
IPPM	IP Performance Metrics
IPSec	IP Security
IPTV	No Expansion
IPV4	Internet Protocol Version 4
IPV6	Internet Protocol Version 6
IPX	Internetwork Packet Exchange
IQN	iSCSI Qualified Name
IR	Infrared
IR	Internet Registry
IR	Initiation and Refresh
IRI	Internationalized Resource Identifier
IRTF	Internet Research Task Force
is	Information Service
IS	Intermediate System
IS-IS	Intermediate System to Intermediate System (routing protocol)
ISAKMP	Internet Security Association and Key Management Protocol
ISATAP	Intra-Site Automatic Tunnel Addressing Protocol
ISC	Internet Systems Consortium, Inc
iSCSI	Internet Small Computer System Interface
ISDN	Integrated Services Digital Network

ISID	Initiator Session Identifier
iSNS	Internet Storage Name Service
ISO	International Organization for Standardization
ISOC	Internet Society
ISP	Internet Service Provider
ISPF	Incremental Shortest Path First
ISS	Internal Sublayer Service
ISUP	ISDN User Part
iTIP	iCalendar Transport-Independent Interoperability Protocol
ITR	Ingress Tunnel Router
ITU	International Telecommunication Union
ITU-T	ITU Telecommunication standardization sector
IU	Information Unit
IUA	ISDN Q.921-User Adaptations Layer
IUMM	In-line Unaware MRB Mode
IV	Impairment Validation
IV	Initialization Vector
IVL	Independent VLAN Learning
IVR	Interactive Voice Response (telephone technology)
IW	Initial Window
IWF	Interworking Function
IXFR	Incremental Zone Transfer
J/KG	Joules per Kilogram
JID	Jabber Identifier
JRD	JSON Resource Descriptor
JSON	JavaScript Object Notation
jwt	Joint Working Team
karp	Keying and Authentication for Routing Protocols
KDC	Kerberos Key Distribution Center
KDF	Key Derivation Function
KE	key establishment
KEK	Key Encryption Key (COMSEC Key)
KEM	Key Encapsulation Mechanism
KINK	Kerberized Internet Negotiation of Keys
KLV	Key-Length-Value
KMP	Key Management Protocol
KMS	Key Management Service
KPAK	Key Management Service Public Authentication Key
kpml	Key Press Markup Language
KSAK	Key Management Service Secret Authentication Key
KSK	Key Signing Key
L-LSP	Label-Only-Inferred-PSC LSP
L2F	Layer 2 Forwarding (Cisco)
L2TP	Layer 2 Tunneling Protocol
L2VPN	Layer 2 Virtual Private Network
L3VPN	Layer 3 Virtual Private Network
LACNIC	Latin American and the Caribbean Internet Addresses Registry
LACP	Link Aggregation Control Protocol
LAG	Link Aggregation Group
LAN	Local Area Network

LATM	Low-overhead MPEG-4 Audio Transport Multiplex
LBR	LLN Border Router
LC	Link Connection
LCAF	LISP Canonical Address Format
LCAS	Link Capacity Adjustment Scheme
LCCE	Logical Cluster Computing Environment
LCI	Location Configuration Information
LCL	Lifted Condensation Level
LCP	large content providers
LCP	Link Control Protocol
lcp	Location Configuration Protocol
LCT	Layered Coding Transport (IETF)
LDAP	Lightweight Directory Access Protocol (pronounced Ell-dap)
LDH	letter-digit-hyphen
LDI	Link Down Indication
LDML	Locale Data Markup Language
LDN	Local Domain Name
LDP	Label Distribution Protocol
LDPC	Low-Density Parity Check
LDR	Link Delivery Ratio
LEDBAT	Low Extra Delay Background Transport
LER	Label Edge Router
LEWP	Line Echo Wave Pattern
LFA	Loop-Free Alternate
lfb	Logical Functional Block
LFC	Level of Free Convection
LFIB	Label Forwarding Information Base
LFN	Local Fixed Node
LFN	Long Fat Network
LFSR	Linear Feedback Shift Register
LI	Lifted Index
LIFO	last-in-first-out
LIP	Loop Initialization Primitive
LIR	Local Internet Registry
LIS	Location Information Server
LISP	Locator-Identifier Split Protocol
LKH	Logical Key Hierarchy
LLC/SNAP	Logical Link Control/Subnetwork Access Protocol
LLDP	Link Layer Discovery Protocol
LLDP-MED	Link Layer Discovery Protocol-Media Endpoint Discovery
LLID	Logical Link Identifier
LLJ	Low Level Jet stream
lln	Low-Power and Lossy Network
LLQC	Last Listener Query Count
LLQI	Last Listener Query Interval
LLQT	Last Listener Query Timer
LLS	Link-Local Signaling
LMA	Local Mobility Anchor
LMDS	Local Multipoint Distribution Service
LMP	Link Management Protocol

LMQC	Last Member Query Count
LMQI	Last Member Query Interval
LMQT	Last Member Query Timer
LMTP	Local Mail Transfer Protocol
LOPS	Loss of Packet Synchronization
LoST	Location-to-Service Translation
LoWPAN	Low-Power Wireless Personal Area Network
LQI	Link Quality Indication
LRDD	Link-based Resource Descriptor Document
LRM	Link Resource Manager
LRU	Least Recently Used
LSA	Link State Advertisement
LSAP	Link Service Access Point
LSB	Locator-Status-Bit
LSC	Lambda Switch Capable
LSC	Link State Control
LSDB	Link State Database Because
lse	Label Stack Entry
LSI	Local Scope Identifier
LSP	Link State Packet
LSP	Link State PDU (Protocol Data Unit)
LSP	Label Switched Path
LSP	Loose Source Routing
LSR	Label Switching Router
LSRR	Loose Source and Record Route
LSW	Least Significant Word
LTE	Long-Term Evolution
LUN	Logical Unit Number
LW-IGMPv3	Lightweight IGMPv3
LW-MLDv2	Lightweight MLDv2
LWSP	linear whitespace
m2/s2	Meters squared per second squared
MA	Multicast Acquisition
ma	Multiple Attachments
MA/RA	Maintenance Agency/Registration Authority
MAC	Message Authentication Code
MAC	Media Access Control
MACE	Middleware Architecture Committee for Education
MAG	Mobile Access Gateway
MAN	Metropolitan Area Network
MANET	Mobile Ad Hoc Network
MAP	Mobility Anchor Point
MAP	Mobile Application Part
MAS	Mobile Access Station
MAX	Maximum
MB	Millibar(s)
MBMS	Multimedia Broadcast/Multicast Service
MC	Motion Compensation
MCC	Management Communication Channel
MCC	Mobile Country Code (telecommunications)

MCC	Mesoscale Convective Complex
MCMS	Multimedia Cable Network System
MCS	Mesoscale Convective System
MCU	Multipoint Control Unit
MCV	Mesoscale Convective Vortex
md	Mesoscale Discussion
MD5	Message Digest 5
MDA	Mail Delivery Agent
MDC	Modification Detection Code
MDL	maximum datagram lifetime
mDNS	Multicast DNS
MDS	Maximal Separable Distance
MED	Multi-Exit Discriminator
MEDIACTRL	Media Server Control
MEG	Maintenance Entity Group
MEP	Maintenance Entity Group End Point
MF	More Fragments
MFIB	Multicast Forwarding Information Base
MG	Media Gateway
MGC	Multimedia Gateway Controller
MGCP	Multimedia Gateway Control Protocol
MHAE	Mobile-Home Authentication Extension
MHP	Multimedia Home Platform
MIB	Management Information Base (ATM)
MIC	Message Integrity Check
MIC	Message Integrity Code
MIDCOM	Middlebox Communications
MIDI	Musical Instrument Digital Interface
MIF	multiple interfaces
MIKEY	Multimedia Internet Keying
MIN	Mobile Identification Number
MINC	multicast inference of network characteristics
MINE	Minimal Encapsulation in IP
MIP	Maintenance Entity Group Intermediate Point
MIP6	Mobile IPv6
MITM	Man in the Middle
MKI	Master Key Identifier
MKT	Master Key Tuple
mLDP	Multipoint LDP
MLDv2	Multicast Listener Discovery Version 2
MLM	Mailing List Manager
MLPP	Multi-Level Precedence and Preemption
MMA	MIDI Manufacturers Association
MME	Mobile Management Entity
MMS	Multimedia Messaging Service
MN	Mobile Node
MN-FA	Mobile Node - Foreign Agent
MNC	Mobile Network Code
MNG	Mobile Network Gateway
MO	Measurement Object

MOBIKE	IKEv2 Mobility and Multihoming
MODP	modular exponentiation group
MOP	Mode of Operations
MOS	Mean Opinion Score
MOS	Model Output Statistics
MOSPF	Multicast Extensions to OSPF
MP-BGP	Multiprotocol BGP
MP2MP	Multipoint-to-Multipoint
MP2PE	Multi-Point to Point Emulation
MPD	Media Presentation Description
MPEG	Motion Picture Experts Group
MPI	Minimum Picture Interval
MPI	Multiprecision Integer
MPLS	Multiprotocol Label Switching
MPLS-TP	MPLS Transport Profile
MPTCP	Multipath TCP
mr	Map Resolver
MR	Mobile Router
MRB	Media Resource Broker
MRD	Multicast Router Discovery
MRIB	Multicast Routing Information Base
MRRU	Maximum Reconstructed Reception Unit
MRT	Multi-Threaded Routing Toolkit
MRTG	Multi Router Traffic Grapher
MRU	Maximum Receive Unit
MS	Media Server
MS	Manual Switch
MS	Message Store
MS	Mobile Station
MS-PW	Multi-Segment Pseudowire
MSA	Mail Submission Agent
MSA	Message Submission Agent
MSA	Mobility Service Authorizer
MSB	Most Significant Bit
MSCML	Media Server Control Markup Language
MSDP	Multicast Source Discovery Protocol
MSL	Maximum Segment Lifetime
MSM	Mobile Station Modem
MSML	Media Server Markup Language
MSN	Master Sequence Number
MSRP	Message Session Relay Protocol
MSS	Mobile Support Station
MSS	Maximum Segment Size (TCP/IP)
MSTP	Multiple Spanning Tree Protocol
MSTP	Mobility Service Transport Protocol
MSW	Most Significant Word
MT	Message Transfer
MT	Multi-Topology
MT	Multiplier
MT	Mobile Terminal

MTA	Mail Transfer Agent
MTA	Mail Transport Agent
MTU	Maximum Transmission Unit
MUA	Mail User Agent (Internet email)
MUA	Message User Agent
MVRP	Multiple VLAN Registration Protocol
MWI	Message-Waiting Indicator
MXF	Material eXchange Format
N-PE	Network-facing PE
NA	Neighbor Advertisement
NAI	Network Access Identifier
NAL	Network Abstraction Layer
NAM	North American Model
NAPT	Network Address Port Translator
NAPTR	Naming Authority Pointer
NAR	New-Access Router
NAS	Network-Attached Storage
NAS	Network Access Server
NAT	Network Address Translation
NAT-PMP	NAT Port Mapping Protocol
NAT-PT	Network Address Translation - Protocol Translation
NAT-T	Network Address Translation Traversal
NBMA	Non-Broadcast Multi-Access
NCE	Network Connection Endpoint
NCE	Neighbor Cache Entry
NCEP	National Centers For Environmental Prediction (form. NMC; NWS Center)
NCP	Network Control Protocol
NCS	Network Control Signaling
ND	Neighbor Discovery
NDN	Named Data Networking
NDP	Neighbor Discovery Protocol
NDP	Neighbor Discovery Process
NE	Network Element
NEA	Network Endpoint Assessment
Nemo	Network Mobility
NENA	National Emergency Number Association
NETCONF	Network Configuration Protocol
NetInf	Network of Information
NEWPRED	No Expansion
NFC	Normalization Form Composed
NFKC	Normalization Form KC
NFS	Network File System
NHC	United States National Hurricane Center
NHLFE	Next Hop Label Forwarding Entry
NI	Named Information
NIC	Network Information Center
NIC	Network Interface Card
NID	Network Identifier
NID	Namespace Identifier
NID	Network Interface Device

NIDS	Network Intrusion Detection System
NIH	Named Information for Humans
NIR	National Internet Registry
NIS	Network Information Service
NIST	National Institute of Standards and Technology
NLM	Network Lock Manager
Nlpid	Network Layer Protocol Identifier
NLRI	Network Layer Reachability Information
NLY	Northerly
nMAG	new Mobility Access Gateway
NMM	Nonhydrostatic Mesoscale Model
NMP	Network Musical Performance
NMS	Network Management System
NNI	Network-Network Interface
NNTP	Network News Transfer Protocol
NORM	NACK-Oriented Reliable Multicast
NOS/OLS	Not_Operational Primitive Sequence / Offline Primitive Sequence
NREN	National Research and Education Network
NRN	Northern
NRPN	Non-Registered Parameter Numbers
NRS	Name Resolution Service
NRZ	Non-Return-To-Zero
NS	Neighbor Solicitation
NSAP	Network Service Access Protocol
NSAP	Network Service Access Point
NSC	Network Simulation Cradle
NSCP	Name Server Control Protocol
NSE	Named Signaling Event
NSEC	NextSECure
NSF	National Sanitation Foundation
NSIS	Next Steps In Signaling
NSLP	NSIS Signaling Layer Protocol
NSP	Network Service Provider
NSP	Network-Specific Prefix
NSP	native service processing
NSS	Namespace Specific String
NSSA	Not-So-Stubby Area
NSSL	National Severe Storms Labratory
NTFS	New Technology File System
NTP	Network Time Protocol
NTSC	National Television Standards Committee
NUD	Neighbor Unreachability Discovery
NUT	Network Under Test
NVA	Negative Vorticity Advection
NVC	Number of Virtual Components
NVT	Network Virtual Terminal
NWS	National Weather Service (formerly U.S. Weather Bureau)
O&M	OAM and Management
OA	Ordered Aggregate
OAM	Operations Administration and Maintenance

OASIS	Organization for the Advancement of Structured Information Standards
OATC	Open Authentication Technology Committee
OCP	Objective Code Point
OCR	Optical Character Recognition
OCSP	Online Certificate Status Protocol
ODU	Optical Data Unit
OEM	Original Equipment Manufacturer (usually in reference to car parts)
OEO	optical-electronic-optical
OF	Objective Function
OFB	Output Feedback
OFDM	Orthogonal Frequency Division Multiplexing
oFIB	ordered forwarding information base
OGC	Open Geospatial Consortium
OGF	Open Grid Forum
OID	Object Identifier
Oif	Outgoing Interface
OIPF	Open IPTV Forum
OLS	Optical Line System
OLSR	Optimized Link State Routing
OLT	Optical Line Terminal
OMA	Open Mobile Alliance
OMAP	Online Multimedia Authorization Protocol
OMP	Optical Multi-Point
ONC	Open Network Computing (Distributed Applications Architecture)
OPES	Open Pluggable Edge Services
OPEX	Operating Expenses
OPEX	Operational Expediture
ORCHID	Overlay Routable Cryptographic Hash Identifiers
ORO	Option Request Option
OS	Operating System
OSI	Open Systems Interconnection (iso Standard)
OSN	Original Sequence Number
OSPF	Open Shortest Path First (ATM)
OSS	Operational Support System
OSSI	Open Source Software Institute
OTAF	Over-the-Air Functionality
OTASP	Over-The-Air Service Provisioning (telcommunications)
OTI	Object Transmission Information
OTN	Optical Transport Network
OTP	One-Time Password authentication
OU	Organizational Unit
OUI	Organizationally Unique Identifier
OWAMP	One-Way Active Measurement Protocol
OXC	Optical Crossconnect
P2MP	Point-To-Multipoint
P2P	Point-To-Point
P2P	Peer-to-peer (networking)
P2PE	Point-to-Point Emulation
P3P	The Platform for Privacy Preferences Project
PA	Provider Assigned (IP address space assigned to a specific provider by IANA)

PA	provider-aggregated
PAA	PANA Authentication Agent
PAC	Proxy Auto-Configuration
PACE	Password Authenticated Connection Establishment
PAD	Peer Authorization Database
PAI	P-Asserted-Identity
PAKE	password-authenticated key exchange
PAL	Phase Alternation Line
PANA	Protocol for Carrying Authentication for Network Access
PAR	previous access router
PAT	Port Address Translation
PB	Provider Bridge
PB	Posture Broker
PBA	Proxy Binding Acknowledgement
PBB	Provider Backbone Bridge
PBKDF2	Password-Based Key Derivation Function 2
PBU	Proxy Binding Update
PBX	Private Branch eXchange (company phone system)
PC	Protocol Controller
PCB	Payload Confidentiality Block
PCC	Path Computation Client
PCE	path computation element
PCEP	Path Computation Element Protocol
PCM	Pulse-Code Modulation
PCMU	Pulse Coded Modulation
PCN	Pre-Congestion Notification
PCP	Port Control Protocol
PCRF	Policy and Charging Rule Function
PD	Prefix Delegation
PDA	Personal Digital Assistant
PDC	Personal Digital Cellular
PDF	Portable Document Format (created by Adobe Acrobat)
PDH	Plesiochronous Digital Hierarchy
PDN	Packet Data Network
PDN GW	Packet Data Network Gateway
PDP	Packet Data Protocol
PDS	Parameter Data Structure
PDSN	Packet Data Serving Node
PDU	Protocol data unit (such as segment, packet, frame, etc.)
PDU	Packet Data Unit or
PDV	Packet Delay Variation
PE	Provider Edge
PEM1	No Expansion
PEN	Private Enterprise Number
PEP	Policy Enforcement Point
PETR	Proxy Egress Tunnel Router
PGM	Pragmatic General Multicast
PGP	Pretty Good Privacy (encryption)
PHB	Per Hop Behavior
PHIB	Previous Hop Insertion Block

PHOP	previous hop
PHP	Penultimate Hop Popping
PHR	Per Hop Reservation
PHY	Physical Layer
PI	Provider Independent
PI	Protocol Instantiation
PIB	Payload Integrity Block
PIDF	Presence Information Data Format
PIDF-LO	Presence Information Data Format Location Object
PII	Personally Identifiable Information
PIM	Protocol Independent Multicast
PIM-SM	Protocol Independent Multicast-Sparse Mode
PIO	Prefix Information Option
PITR	proxy ingress tunnel router
PKCS	Public-Key Cryptography Standards
PKG	Private-Key Generator
PKI	Public Key Infrastructure (cryptography)
PKINIT	Public Key Cryptography for Initial Authentication in Kerberos
PKIX	Public Key Infrastructure using X.509
PL	Protocol Layer
PLC	Policy Lifetime Change
PLC	Power line communication (electricity)
PLC	Packet Loss Concealment
PLCP	Physical Layer Convergence Procedure
PLMN	Public Land-based Mobile Network
PLPMTUD	Packetization Layer Path MTU Discovery
PLR	Packet Loss Rate
PLR	Point of Local Repair
pMAG	previous Mobility Access Gateway
PMD	Physical Medium Dependent
PMIPv6	Proxy Mobile IPv6
PMS	Physical Media Specific
PMSI	Provider Multicast Service Interface
Pmtu	Path Mtu Recovery
Pmtud	Path Mtu Discovery
PNG	Portable Network Graphics (graphic file standard/extension)
PNNI	Private Network-Network Interface
POI	Purge Originator Identification
PON	Passive Optical Network
POP	Point Of Presence (Internet)
POP	Post Office Protocol
POP	proof of possession
POS	PPP Over SONET
POSIX	Portable Operating System Interface
POTS	Plain Old Telephone Service (FCW)
PPP	Point-to-Point Protocol
PPPoA	Point-to-Point Protocol Over ATM
PPPoE	Point-to-Point Protocol Over Ethernet
PPS	Packets Per Second
PPSP	Peer-to-Peer Streaming Portocol

PPTP	Point-to-Point Tunneling Protocol
PR-SCTP	Partially Reliable-Stream Control Transmission Protocol
PRF	pseudorandom function
PRL	Potential Router List
PRNG	Pseudorandom Number Generator
PRR	Port-Range Router
PRR	Policy Reserve Rule
PS	Proxy Signature
PS	Parametric Stereo
PSAMP	Packet Sampling
PSAP	Public Safety Answering Point (911)
PSC	Packet Switch Capable
PSD	Power Spectral Density
PSK	Pre-Shared Key
PSN	Public Switched Network
PSN	Packet Switched Network
PSS	Probabilistic Signature Scheme
PSS	Packet-switched Streaming Service
PSTN	Public Switched Telephone Network
PT	posture transport
Pt	Payload Type (ATM)
PTI	Payload Type Identifier (ATM)
PTK	Pairwise Transient Key
PTM	Point-To-Multipoint
PTM	Pulse-Time Modulation
PTM	Packet Transfer Mode
PTP	Point To point Protocol
PTS	Presentation Time Stamps (MPEG systems)
PTSW	payload type switch
PV	Potential Vorticity
PVA	Positive Vorticity Advection
PVC	Permanent Virtual Circuit (ATM)
PVP	Permanent Virtual Path
PVT	Public Validation Token
PW	pseudowire
PWE3	Pseudowire Emulation Edge-to-Edge
QG	Quasi-Geostrophic Analysis
QLCS	Quasi-Linear Convective System
QOE	Quality of Experience
QOP	Quality Of Protection
QoS	Quality of Service
QQIC	Querier's Query Interval Code
QRV	Querier's Robustness Variable
QSIG	Q-Signaling protocol
R2T	request-to-transmit
RA	Routing Area
RADIUS	Remote Authentication Dial-In User Service
RAID	Redundant Array of Independent Disks
RAMS	Rapid Acquisition of Multicast Sessions
RAMS-R	RAMS Request

RAMS-T	RAMS Termination
RAN	Radio Access Network
RANAP	Radio Access Network Application Protocol
RANGER	Routing and Addressing in Networks with Global Enterprise Recursion
RAO	Router Alert Option
RAOB	Radiosonde Observation
RAP	RAP id Refresh
RAQMON	Real-time Application Quality-of-Service Monitoring
RBR	Realm Border Router
RBridge	Routing Bridge
RC	Routing Controller
RCODE	No Expansion
RD	Route Distinguisher
RD	Router Discovery
RDDP	Remote Direct Data Placement Protocol
RDF	Resource Description Framework
RDI	Remote Defect Indicator (UNI Fault Management)
RDMA	Remote Direct Memory Access
RDN	Relative Distinguished Name
RDO	Route Discovery Option
RDS	Resolution Discovery System
RE	Redundancy Elimination
REAP	Reachability Protocol
RED	Random Early Detection
RELAX NG	REgular LAnguage for XML Next Generation
REST	Representational State Transfer
RF	Radio Frequency
RFD	Reduced Function Device
RIB	Routing Information Base
RIID	Rendezvous Point Interface ID
RIP	Routing Information Protocol
RIPE NCC	Reseaux IP Europeens Network Coordination Centre
RIPNG	Routing Information Protocol Next Generation
RIR	Regional Internet Registry
RISC	Reduced Instruction Set Computer
RJRS	Recovery Journal Receiver Structure
RJSS	Recovery Journal Sending Structure
RLE	Run-Length Encoding
RLMI	Resource List Meta-Information
RLOC	Routing Locator
RLS	Resource List Server
RMON	Remote Monitoring
rms	root mean square (preferred over "RMS")
RMT	Reliable Multicast Transport
RNC	Radio Network Controller
ROA	Route Origin Authorization
ROADM	Reconfigurable Optical Add/Drop Multiplexer
ROHC	Robust Header Compression
ROLL	Routing Over Low-Power and Lossy
RP	Rendezvous Point

RP	Relying Party
RPC	Remote Procedure Call
RPF	Reverse Path Forwarding
RPKI	Resource Public Key Infrastructure
RPL	Routing Protocol for Low-Power and Lossy Networks
RPN	Registered Parameter Numbers
RPSL	Routing Policy Specification Language
RR	Receiver Report
RR	Resource Record
RR	Route Reflector
RRO	Record Route Object
RRT	Return Routability Test
RS	Retransmission Server
RS	Router Solicitation
RSA	Rivest, Shamir, & Adleman
RSAES-OAEP	RSA Encryption Scheme - Optimal Asymmetric Encryption Padding
RSASSA-PSS	RSA Probabilistic Signature Scheme
RSIP	Realm Specific IP
RSOO	Relay-Supplied Options option
RSSI	Received Signal Strength Indication
RSTP	Rapid Spanning Tree Protocol
RSVP	Resource Reservation Protocol (Internet)
RSVP-TE	RSVP - Traffic Engineering
RTBH	Remote Triggered Black Hole
RTCP	Real-time Transport Control Protocol
RTMP	Real Time Messaging Protocol
RTO	Retransmission Timeout
RTP	Real-Time Transport Protocol
RTS	Request To Send
RTSP	Real Time Streaming Protocol
RTT	round-trip time
RTX	Request Retransmission
RVS	Rendezvous Server
RW	Restart Window
RZ	Return-to-Zero
S-BGP	Secure Border Gateway Protocol
S-GW	Serving Gateway
S-NAPTR	Straightforward-Naming Authority Pointer
S-PE	Switching Provider Edge
S-PMSI	Selective PMSI
S/D	Source/Destination
S/MIME	Secure/Multipurpose Internet Mail Extensions
S2L	source-to-leaf
SA	Source Address
SA	Source-Active
SA	Security Association
SACK	Selective Acknowledgment
SAD	Security Association Database
SAFI	Subsequent Address Family Identifier
SAID	Security Association Identifier

salt	Speech Application Language Tag
SAML	Security Assertion Markup Language
SAN	System Area Network
SAN	Subject Alternative Name
SAOL	Structured Audio Orchestra Language
SAP	Serving Access Point
SAP	Session Announcement Protocol
SAR	Segmentation and Reassembly (ATM)
SASL	Simple Authentication and Security Layer
SAToP	Structure-Agnostic Time Division Multiplexing over Packet
SAVI	Source Address Validation Improvement
SAVP	Secure Audio-Visual Profile
SAVPF	Secure Audio-Visual Profile with Feedback
SB	Source Block
SBC	Session Border Controller
SBM	Subnet Bandwidth Manager
sbn	Source Block Number
SBR	Spectral Band Replication
SC	Softwire Concentrator
SCCRP	Start-Control-Connection-Reply
SCCRQ	Start-Control-Connection-Request
SCHAC	Schema for Academia
SCRAM	Salted Challenge Response Authentication Mechanism
SCS	Secure Cookie Sessions
SCSI	Small Computer System Interface
SCT	Sender Current Time
SCTP	Stream Control Transmission Protocol
SCVP	Server-Based Certificate Validation Protocol
SCVP	Simple Certificate Validation Protocol
SDAT	Simple DNA address table
sdes	Source Description
SDH	Synchronous Digital Hierarchy (ATM)
SDID	Signing Domain Identifier
SDNV	Self-Delimiting Numeric Value
SDO	Standards Development Organization
SDP	Session Description Protocol
SDU	Service Data Unit (ATM)
seal	Subnetwork Encapsulation and Adaptation Layer
secg	Standards for Efficient Cryptography Group
send	SEcure Neighbor Discovery
SFGMP	Source Filtering Group Management Protocol
SFMT	sub-feedback message type
SGW	Serving Gateway
SHA	Secure Hash Algorithm
SHDSL	Single-pair High-speed Digital Subscriber Line
SHIM	Stanza Headers and Internet Metadata
SI	softwire initiator
SID	Silence Insertion Descriptor
SIDR	Secure Inter-Domain Routing
SIFS	Short InterFrame Space

SIMCO	Simple Middlebox Configuration
SIMD	Single Instruction, Multiple Data (system) (processor)
SIMPLE	SIP for Instant Messaging and Presence Leveraging Extensions
SIP	Session Initiation Protocol
SIPP	Simple Internet Protocol Plus
SIPS	Session Initiation Protocol Secure
SLA	Service Level Agreement
SLAAC	Stateless Address Autoconfiguration
SLI	Set-Link-Info
SLLA	Source Link-Layer Address
SLLAO	Source Link-Layer Address Option
SLP	Service Location Protocol
Sly	Southerly
SMB	Session Management Broker
SMDs	Switched Multimegabit Data Service (ATM)
SMF	Standard MIDI File
SMI	Structure of Management Information
SMIL	Synchronized Multimedia Integration Language
SMIv2	Structure of Management Information Version 2
SMPTE	Society of Motion Picture and Television Engineers, Inc.
SMR	Solicit-Map-Request
SMS	Short Message Service
SMSS	sender maximum segment size
SMTP	Simple Mail Transfer Protocol
smux	SNMP Multiplex Protocol
SN	Sequence Number
SNAP	Simple Notification and Alarm Protocol
SNI	Server Name Indication
SNIA	Storage Networking Industry Association
SNID	subnamespace identifier
SNMP	Simple Network Management Protocol (ATM)
SNP	Subnetwork Point
SNP	Sequence Number Packet
SNR	Signal-to-Noise Ratio
SNTP	Simple Network Time Protocol
SOA	Start of Authority (domain name system record)
SOAP	Simple Object Access Protocol
SOHO	Small Office Home Office
SONET	Synchronous Optical Network
SOP	Start of Packet
SOP	Same-Origin Policy
SPC	Storm Prediction Center
SPD	Security Policy Database
SPE	Synchronous Payload Envelope
SPF	Sender Policy Framework
SPF	Shortest Path First
SPI	Security Parameter Index
SPIT	Spam Over Internet Telephony
SPKI	Simple Public Key Infrastructure
SPKM	Simple Public-Key GSS-API Mechanism

SPM	Secure Password Method
SPME	Sub-Path Maintenance Element
SPND	Secure Proxy Neighbor Discovery
SPNEGO	Simple and Protected GSS-API Negotiation Mechanism
SPT	Shortest Path Tree
SPVC	Switched Permanent Virtual Circuit
SQL	Structured Query Language
SR	sender report
SREF	Short Range Ensemble Forecast system
SRH	Storm Relative Helicity
SRH	Source Routing Header
SRLG	Shared Risk Link Group
srn	Southern
SRP	Secure Remote Passwords
SRP	Secure Routing Protocol
SRR	Status Report Request
SRTCP	Secure Realtime Transport Control Protocol
SRTP	Secure Realtime Transport Protocol
SRV	Service Record
SS-FSSI	Sender-Side FEC-Scheme-Specific Information
SS-PW	Single-Segment Pseudowire
SS7	Signaling System 7
SSAP	Source Service Access Point
SSE	State Signaling Event
SSE	Server Session End
SSEO	SPC Storm-Scale Ensemble of Opportunity
SSID	Service set identifier (Wi-Fi)
SSK	Secret Signing Key
SSL/TLS	Secure Socket Layer/Transport Layer Security
SSM	Single Source Multicast
SSM	Source-Specific Multicast
ssn	Stream Sequence Number
SSN	Station Serial Number
sso	Single Sign-On Once
SSPI	Security Support Provider Interface
SSRC	Synchronization Source
SSRR	Strict Source and Record Route
SSV	Secret State Verifier
SSV	Shared Secret Value
STB	Set-Top Box
STP	Secure Transfer Protocol
STP	Spanning Tree Protocol
STS	Synchronous Transport Signal
SUT	System Under Test
SVC	Switched Virtual Circuit (ATM)
SVG	Scalable Vector Graphics
SVL	Shared VLAN Learning
SWODY1	Severe Weather Outlook - Day 1
SWODY2	Severe Weather Outlook - Day 2
SWODY3	Severe Weather Outlook - Day 3

SYN	No Expansion
T-MPLS	Transport MPLS
T-PE	Terminating Provider Edge
tamp	Trust Anchor Management Protocol
TC	Tropical Cyclone
TCAM	Ternary Content-Addressable Memory
TCN	Topology Change Notification
TCP	Transmission Control Protocol
TCU	Towering Cumulus
TD	Tropical Depression
TDD	Telecommunication Device for the Deaf
TDIM	Time-Division Inverse Multiplexing
TDM	Time Division Multiplexer
TDMA	time-division multiple access
TDMoIP	Time Division Multiplexing over IP
TE	Traffic Engineering
TED	Traffic Engineering Database
TEI	Terminal Endpoint Identifier
TEP	tunnel endpoint
TERENA	Trans-European Research and Education Networking Association
TESLA	Timed Efficient Stream Loss-Tolerant Authentication
TF-EMC2	Task Force on European Middleware Coordination and Collaboration
TFRC	TCP-Friendly Rate Control
TFS	Time and Frequency Synchronization
TFTP	Trivial File Transfer Protocol (ATM)
TGS	Ticket-granting Server
TGT	ticket-granting ticket
TIAS	Transport Independent Application Specific)
TIMIP	Terminal Independent Mobile IP
TKIP	Temporal Key Integrity Protocol
TLD	Top-Level Domain
tLDP	Targeted LDP
TLLA	Target Link-Layer Address
TLLAO	Target Link-Layer Address Option
TLS	Transport Layer Security
TLSP	TRILL Link State Protocol
TLV	Type-Length-Value
TML	Transport Mapping Layer
TNC	Trusted Network Connect
TNCP	TRILL Network Control Protocol
TNP	TRILL Network Protocol
TOE	Target of Evaluation
TOI	Transmission Object Identifier
ToIP	Real-time Text over Internet Protocol
TPDU	Transport Protocol Data Unit
TPGT	Target Portal Group Tag
tpm	Transport Performance Metrics
TPS	Transport Protocol Specific
TRILL	TRansparent Interconnection of Lots of Links
TS	Tropical Storm

TS	Traffic Selector
TS	Transport Stream
TSI	Transport Session Identifier
tsm	Transport Security Model
TSN	Test Support Network
TSN	Trunk Switched Network
TSN	Transmission Sequence Number
TSTM	Thunderstorm
TTD	Throughput Test Device
TTL	Time To Live
TTSI	Text-To-Speech Interface
TU	Time Unit
TUG	Tributary Unit Group
TURN	Traversal Using Relay NAT
TV	Type/Value
TWAMP	Two-Way Active Measurement Protocol
TX	Transmission
U-NII	Unlicensed National Information Infrastructure Devices
U-PE	User-facing PE
UA	User Agent
UAC	User Agent Client
UAM	Universal Access Method
UAS	Unavailable Seconds
UAS	User Agent Server
UDDI	Universal Description, Discovery, and Integration
UDP	User Datagram Protocol (FDDI related)
UDP-Lite	User Datagram Protocol Lite
UDPTL	UDP Transport Layer
UDVM	Universal Data/Voice Multiplexer
UE	User Equipment
UI	User Interface
UID	Unique Identifier
UKMET	United Kingdom METeorological Office Model
ULA	Unique Local Address
ULID	Upper-Layer Identifier
ULJ	Upper-Level Jet
ULP	Unequal Loss Protection
UMA	Unlicensed Mobile Access
UMB	Ultra Mobile Broadband
UML	Unified Modeling Language (Object Management Group, OMG)
UMTS	Universal Mobile Telecommunications Standard
UNI	User-Network Interface
UNSAF	UNilateral Self-Address Fixing
UPnP	Universal Plug and Play
URI	Uniform Resource Identifier
URN	Uniform Resource Namespace
uRPF	Unicast Reverse Path Forwarding
US-CERT	US Computer Emergency Readiness Team
USB	Universal Serial Bus
USM	User-based Security Model

USRK	Usage-Specific Root Keys
UTC	Coordinated Universal Time
UTF-8	Unicode Transformation Format 8
UTI	Universal Transport Interface
UTRAN	Universal Terrestrial Radio Access Network
UUID	Universally Unique Identifier (see Also GUID)
UVV	Upward Vertical Velocity
VACM	View-based Access Control Model
VAD	Velocity-Azimuth Display
VAD	Voice Activity Detection
VBD	Voiceband Data
VBR-NRT	Variable Bit Rate - Non Real Time
VBR-RT	Variable Bit Rate - Real Time
VC	Virtual Circuit (ATM)
vCard	No expansion
VCat	Virtual Concatenation
VCC	Virtual Channel Connection (ATM)
VCCV	Virtual Circuit Connectivity Verification
VCI	Virtual Channel Identifier
VCI	Virtual-Circuit Identifier
VDL	Valid Data Length
VDSL	Very High Speed Digital Subscriber Line
vet	Virtual Enterprise Traversal
VIL	Vertically Integrated Liquid
VLAN	Virtual Local Area Network
vlb	Valiant Load-Balancing
VMR	Variable Multi Rate
VMR-WB	Variable Multi Rate WideBand
VOD	Video On Demand
VOIP	Voice Over IP (Internet Protocol)
VOP	Video Object Plane
VPC	Virtual Path Connection (ATM)
VPI	Virtual Path Identifier
VPIM	Voice Profile for Internet Mail
VPLS	Virtual Private LAN Service
VPN	Virtual Private Network (ATM)
VPWS	Virtual Private Wire Service
Vrf	Virtual Routing and Forwarding Tables
VRP	VLAN Registration Protocol
VRRP	Virtual Router Redundancy Protocol
VSA	vendor-specific attribute
VSP	Voice Service Provider
VSS	Virtual Subnet Selection
VT	Virtual Tributary (ATM)
VWP	VAD Wind Profile
VXML	VoiceXML
W-CDMA	Wideband Code Division Multiple Access
W3C	World Wide Web Consortium
WAA	Warm Air Advection
WAN	Wide Area Network

WAP	Wireless Application Protocol
WDM	Wavelength Division Multiplexing (fiber optics)
WEBDAV	Web Distributed Authoring and Versioning
WEBRC	Wave and Equation Based Rate Control
WEP	Wired Equivalent Privacy
WF	Wildcard-Filter
WFO	Weather Forecast Office
WFQ	Weighted Fair Queuing
WG	Working Group
WGS 84	World Geodetic System 1894
WHT	Walsh-Hadamard Transform
WiMAX	Worldwide Interoperability for Microwave Access, Inc.
WLAN	Wireless Local Area Network
WLY	Westerly
wm	Wireless Medium
WPC	Weather Prediction Center
WRAP	Web Resource Authorization Profiles
WRF	Weather Research and Forecasting
Wrn	Western
WRR	Weighted Round Robin
WS	White Space
WSON	Wavelength Switched Optical Networks
WSP	whitespace
WW	Weather Watch
WWN	World Wide Name
WWNN	World Wide Node Name
WWPN	World Wide Port Name (IBM ESS training/fiber channel)
XCAP	Extensible Markup Language (XML) Configuration Access Protocol
XCON	Centralized Conferencing
XDR	External Data Representation protocol
XLAT	translator
XML	Extensible Markup Language
XML-RPC	Extensible Markup Language-Remote Procedure Calling
XMLDSIG	XML Digital Signatures
XMPP	Extensible Messaging and Presence Protocol
XNQ	eXtended Network Quality
XOR	Exclusive Or
XR	Extended Report
xrd	Extensible Resource Descriptor
XRI	Extensible Resource Identifier
XSD	XML Schema Definition
XUI	XCAP User Identifier
Z	Zulu Time
ZKPP	Zero-Knowledge Password Proof
ZSK	Zone Signing Key (information technology)