Acronym

Meaning

Primary Applicability

Normative Reference

ACK

Acknowledgement

Transport and other layers

TCP/IP, for example. RFC 793

ACL

Access control list

Security, application layer

Access control list, Cisco overview

ADSL

Asymmetric digital subscriber line

Telecom

ITU-T G.992.5 Annex M, for example

AES

Advanced Encryption Standard

Security

U.S. FIPS PUB 197

ANSI

American National Standards Institute

Organization

ANSI

ARP

Address Resolution Protocol

Link layer

RFC 1122

ATM

Asynchronous Transfer Mode

Telecom

ATM cell description

BGP

Border Gateway Protocol (routing protocol)

Application layer, Routers

RFC 4271

BSS

Basic service set (Wi-Fi)

Wireless

IEEE Std 802.11-2007

CAT

Category (e.g. CAT-5 cable)

Physical layer

ANSI/TIA/EIA-568-B.1-2001

CCITT (obs.)

Standards organization that has been replaced by ITU-T

Organization

ITU-T

CHAP

Challenge-Handshake Authentication Protocol (PPP)

Security, telecom

RFC 1994

CIDR

Classless Inter-Domain Routing

Architecture

RFC 1518 RFC 1519

CIR

Committed Information Rate (Frame Relay)

Telecom

RFC 1490 RFC 1973 RFC 2427

CLI

Command line interpreter

Hardware

Catalyst 6500 Series Command Reference, 7.6, for example

CPE

Customer premises equipment

Telecom

Telecom Glossary

CRC

Cyclical redundancy check

Link and other layers

24 References here.

CRC-16-CCITT

Cyclical redundancy check (X.25, HDLC)

Link layers

Reference on CRC page.

CSMA/CA

Carrier sense multiple access / collision avoidance

Wireless

IEEE Std 802.11 Downloads

CSMA/CD

Carrier sense multiple access / collision detection

Physical layer

IEEE Std 802.3TM-2002

CSU/DSU

Channel service unit / data service unit

Telecom

Telecom Glossary

DCE

Data communications equipment

Telecom

Telecom Glossary

DEC (obs.)

Digital Equipment Corporation

Organization

Purchased by Compaq in 1998. Merged with Hewlett-Packard 2002.

DES

Data Encryption Standard (obs. See AES)

Security

Federal Information Processing Standard (FIPS) FIPS-46-3

DHCP

Dynamic Host Configuration Protocol

Application layer, Internet Layer

RFC 2131 and others

DNS

Domain Name System

Application layer

Over 30 RFCs here.

DRAM

Dynamic random-access memory

Hardware

DSL

Digital Subscriber Line

Telecom

Telecom Glossary

DSLAM

Digital Subscriber Line Access Muliplexor

Telecom

Telecom Glossary (proposed)

DTE

Data Terminal Equipment

Telecom

Telecom Glossary

EHA

Ethernet Hardware Address (MAC address)

Link layer

IEEE Std 802 IEEE OUI Assignments

EIA

Electronics Industry Alliance

Organization

EIA

EIGRP

Enhanced Interior Gateway Routing Protocol

Internet Layer

Cisco Doc ID: 16406

EOF

End Of Frame (HDLC, etc.)

Link layer

HDLC framing

ESS

Extended service set (Wi-Fi group)

Wireless

IEEE Std 802.11-2007

FCC

Federal Communications Commission (US)

Organization

US FCC

FCS

Frame check sequence (Ethernet)

Link layer

Ethernet Frame IEEE Std 802.3

FDDI

Fiber Distributed Data Interface

Link layer

American National Standards Institute X3T9.5 (now X3T12), ISO/IEC 9314-x

FTP

File Transfer Protocol

Application layer

RFC 959 and others

GBIC

Gigabit interface converter

Hardware

Seagate Specification

Gbps

Gigabit per second

Physical layer

Gigabit per second

HDLC

High-level Data Link Control

Link layer

ISO 13239

http

HyperText Transfer Protocol

Application layer

W3C Change History for HTTP

https

HyperText Transfer Protocol Secure

Transport and other layers

SSL 3.0 Specification

IANA

Internet Assigned Number Authority

Organization

IANA

ICMP

Internet Control Message Protocol

Internet Layer

RFC 792

IDF

Intermediate distribution frame

Physical layer

Structured cabling or Telecom Glossary

IDS

Intrusion Detection System

Security

Cisco Product Index

IEC

Commission Electrotechnique Internationale (French)

Organization

IEC

IEEE

Institute for Electrical and Electronic Engineers

Organization

IEEE

IETF

Internet Engineering Task Force

Organization

IETF

IMAP

Internet Message Access Protocol

Application layer

RFC 3501

IP

Internet Protocol

Internet Layer

RFC 791 RFC 1606

IPS

Intrusion prevention system

Security

“NIST – Guide to Intrusion Detection and Prevention Systems (IDPS)”. 2007-02. Retrieved 2010-08-24.

IS-IS

Intermediate System to Intermediate System (routing protocol)

Internet Layer

ISO/IEC 10589:2002

ISDN

Integrated Services Digital Network

Telecom

IEC Area 716-xx

ISP

Internet service provider

Telecom

Telecom Glossary

ITU-T

International Telecommunications Union

Organization

http://www.itu.int

kbps

Kilobit per second

Physical layer

Kilobit_per_second

LAN

Local area network

Link and other layers

Telecom Glossary

LAPB

Link Access Procedure, Balanced (x.25)

Telecom

ITU-T Recommendation X.222

LAPF

Link-access procedure for frame relay

Telecom

RFC 1490

LLC

Logical link control

Link layer

Telecom Glossary

MAC

Media access control

Link layer

IEEE Std 802.3 and 802.11, for example

MAN

Metropolitan area network

Telecom

Telecom Glossary

Mbps

Megabits per second

Physical layer

Megabit_per_second

MC

Multiple choice

IT Professional Certification

About certification exams

MDF

Main distribution frame

Physical layer

Glossary See also Structured cabling

MIB

Management information base (SNMP)

Application layer

RFC 3418

MPLS

Multiprotocol Label Switching

network technology

MTU

Maximum Transmission Unit

Multiple layers

NAC

Network access control

Link and other layers

IEEE 802.1x

NAT

Network Address Translation

Internet Layer

Cisco Internet Protocol Journal: A look Inside Network Address Translators

NBMA

Non-Broadcast Multiple Access (e.g. Frame Relay ATM)

Telecom

See ATM, Frame Relay and X.25, for examples.

NIC

Network Interface Card

Physical layer

Telecom Glossary

NRZ

Non-return-to-zero

Physical layer

Federal Standard 1037C

NRZI

Non-return to zero inverted

Physical layer

Federal Standard 1037C

NVRAM

Non-volatile RAM

Hardware

Sample vendor data here

OSI

Open System Interconnect (joint ISO and ITU standard)

Organization

ISO/IEC 9594-5:2005 Open Systems Interconnection Protocol Specifications

OSPF

Open Shortest Path First (routing protocol)

Internet Layer

RFC 2238

OUI

Organization Unique Identifier

Link and other layers

IEEE OUI Assignments

PAP

Password authentication protocol

Security

RFC 1334

PAT

Port address translation

Internet Layer

RFC 1918

PC

Personal computer (host)

Hardware

PIM

Personal information manager

Software category

PCM

Pulse-code modulation

Physical layer

ITU-T G.711

PDU

Protocol data unit (such as segment, packet, frame, etc.)

Multiple layers

Fed Std 1037C

POP3

Post Office Protocol, version 3

Application layer

RFC 1939

POP

Point of presence

Telecom

Telecom Glossary

POST

Power-on self test

Hardware

Cisco Catalyst 2800 User Guide, for example

POTS

Plain old telephone service

Telecom

Telecom Glossary

PPP

Point-to-point Protocol

Telecom

RFC 1661

PPTP

Point-to-Point Tunneling Protocol

Telecom

RFC 2637

PTT

Public Telephone and Telegraph

Telecom

Telecom Glossary or Free Dictionary

PVST

Per-VLAN Spanning Tree

Link layer

Cisco’s introduction to Spanning Tree Protocol

RADIUS

Remote Authentication Dial-In User Service

Security

RFC 2865

RAM

Random Access Memory

Physical layer

Telecom Glossary

RARP

Reverse ARP

Link layer

RFC 903

RFC

Request for Comments

Multiple layers

IETF’s RFC Index

RIP

Routing Information Protocol

Internet Layer

RFC 2453, for RIP version 2

RLL

Run-Length Limited

Physical layer

RLL is used in a wide range of encodings.

ROM

Read-Only Memory

Hardware

Telecom Glossary

RSTP

Rapid Spanning Tree Protocol

Link layer

IEEE 802.1w – Rapid Reconfiguration of Spanning Tree

RTP

Real-time Transport Protocol

Application layer

RFC 3550

SDLC

Synchronous Data Link Control

Link layer

Cisco Technology Handbook: SDLC and Derivatives

SFD

Start-of-frame delimiter (Ethernet, HDLC, etc.)

Link layer

IEEE 802.3 (Ethernet), or RFC 2687 (HDLC), for examples

SFP

Small form-factor pluggable

Hardware

Seagate Specification

S-HTTP

Secure HTTP (rarely used)

Transport and other layers

RFC 2660 See also https

SLARP

Serial Line ARP (Address Resolution Protocol)

Link and other layers

Archived Cisco Serial Line Encapulation extension

SLIP

Serial Line Internet Protocol (obs.)

Telecom

RFC 1055

SMTP

Simple Mail Transfer Protocol

Application layer

RFC 5321

SNA

Systems Network Architecture (IBM)

Multiple layers

SNA Protocol Suite

SNAP

SubNet Access Protocol

Link layer

IEEE 802 Overview and Architecture

SNMP

Simple Network Management Protocol

Application layer

RFC 1155, RFC 3410 thru RFC 3418 and others

SOF

Start of frame

Link layer

IEEE 802.3 (Ethernet), or RFC 2687 (HDLC), for examples

SRAM

Static random access memory

Hardware

PC Guide’s Definition

SSH

Secure shell

Application layer

RFC 4252

SSID

Service set identifier (Wi-Fi)

Wireless

IEEE 802.11

STP

Spanning Tree Protocol

Link layer

Cisco’s Introduction to Spanning Tree Protocol

SYN (TCP)

Synchronization

Link and other layers

RFC 793 and many others

TCP/IP

Transmission Control Protocol/Internet Protocol

Transport layer

RFC 793 and many others

TDM

Time-division multiplexing

Physical layer

Fed Std 1037C

TFTP

Trivial File Transfer Protocol

Application layer

RFC 1350

TIA

Telecommunications Industry Alliance

Organization

Telecommunications Industry Association

UDP

User Datagram Protocol

Transport layer

RFC 768

USB

Universal Serial Bus

Physical and other layers

USB 3.0 Specification

UTP

Unshielded twisted pair

Physical

Many versions are defined by TIA, such as: TIA-568-B

VC

Virtual circuit

Transport and other layers

Telecom Glossary

VLAN

Virtual local area network

Link layer

IEEE 802.1Q

VLSM

Variable-length subnet masking

Architecture

RFC 1518 RFC 1519

VPN

Virtual private network

Application layer

Virtual Private Network Consortium

W3C

World Wide Web Consortium

Organization

W3C

WAN

Wide-area network

Telecom

Telecom Glossary

WEP

Wired Equivalent Privacy

Wireless

IEEE 802.11

Wi-Fi

IEEE 802.11 (Wi-Fi Alliance)

Wireless

Wi-Fi Alliance

WPA

Wi-Fi Protected Access

Security

IEEE 802.11i

www

World Wide Web

Architecture

W3C Consortium

 

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