Acronyms and Abbreviations

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This element lists abbreviations, acronyms, and initialisms used in this book and in the internetworking industry. Many of these acronyms and other terms are also described in the Cisco Internetworking Terms and Acronyms resource, available at http://www.cisco.com/ univercd/cc/td/doc/cisintwk/ita/.

Acronym

Expanded Term

mu-sec

Microsecond

1RU

One rack unit

3DES

Triple Data Encryption Standard

3G

Third-generation

6PE

IPv6 on the MPLS PE routers

6-to-4

IPv6 to IPv4 tunnel

AAA

Authentication, authorization, and accounting

ABR

Area border router

AC

Alternating current

ACD

Automatic call distribution

ACELP

Algebraic code-excited linear prediction

ACL

Access Control List

ACNS

Application and Content Networking System

ACS

Access Control Server

AD

Advertised distance

ADPCM

Adaptive Differential Pulse Code Modulation

ADSL

Asymmetric DSL

AES

Advanced Encryption Standard

AIM

Advanced integration module

ALG

Application level gateway

AMR-NB

Adaptive Multi-Rate Narrow Band

ANS

Application Networking Services

Acronym

Expanded Term

ANSI

American National Standards Institute

AON

Application-Oriented Networking

AP

Access point

API

Application programming interface

APS

Automatic protection switching

ARCnet

Attached Resource Computer Network

ARP

Address Resolution Protocol

AS

Autonomous system

ASA

Adaptive Security Appliance

ASBR

Autonomous system boundary router

ASDM

Adaptive Security Device Manager

ASIC

Application-specific integrated circuit

ATM

Asynchronous Transfer Mode

AWPP

Adaptive Wireless Path Protocol

B

Bearer

BASc

Bachelor's degree in applied science

BCMSN

Building Cisco Multilayer Switched Networks

BECN

Backward explicit congestion notification

BER

Bit error rate

BGP

Border Gateway Protocol

BGP-4

BGP Version 4

BGP4+

Multiprotocol extensions to BGP version 4

BHT

Busy-hour traffic

BIA

Burned-in address

BOM

Bill of Materials

BOOTP

Bootstrap Protocol

BPDU

Bridge protocol data unit

BRI

Basic Rate Interface

BSCI

Building Scalable Cisco Internetworks

BSS

Basic Service Set

BSSID

Basic Service Set Identifier

CA

Collision Avoidance Certificate authority

CAC

Call admission control

Acronym

Expanded Term

CAM

Content-addressable memory

CAR

Committed access rate

CAS

Channel associated signaling

CatOS

Catalyst operating system

CATV

Cable TV

CBC-DES

Cipher-block chaining data encryption standard

CBWFQ

Class-based weighted fair queuing

CCDA

Cisco Certified Design Associate

CCDP

Cisco Certified Design Professional

CCIE

Cisco Certified Internet Expert

CCITT

Consultative Committee for International Telegraph and Telephone

CCK

Complementary Code Keying

CCKM

Cisco Centralized Key Management

CCNA

Cisco Certified Network Associate

CCNP

Cisco Certified Network Professional

CCS

Common channel signaling

Centum Call Second

CCSI

Cisco Certified Systems Instructor

CCX

Cisco-Compatible Extensions

CD

Collision Detection

CDMA

Code Division Multiple Access

CDP

Cisco Discovery Protocol

CEF

Cisco Express Forwarding

CELP

Code Excited Linear Prediction Compression

CGMP

Cisco Group Management Protocol

CIDR

Classless interdomain routing

CIR

Committed information rate

CISP

Cardholder Information Security Program

CKIP

Cisco Key Integrity Protocol

CLI

Command-line interface

CLNP

Connectionless Network Protocol

CLNS

Connectionless Network Service

CMIC

Cisco Message Integrity Check

Acronym

Expanded Term

CMTS

Cable Modem Termination System

CNS

Cisco Network Service

CO

Central office

CoPP

Control plane policing

CoS

Class of service

CPE

Customer Premises Equipment

CQ

Custom queuing

CRTC

Canadian Radio-television and Telecommunications Commission

cRTP

RTP header compression, or compressed RTP

CS-ACELP

Conjugate Structure Algebraic Code Excited Linear Prediction Compression

CSC-SSM

Content Security and Control Security Services Module

CSMA

Carrier sense multiple access

CSMA/CD

Carrier sense multiple access collision detect

CST

Common Spanning Tree

CTI

Computer telephony integration

CTS

Clear to send

D

Delta

DAI

Dynamic ARP Inspection

dB

Decibel

dBi

dB isotropic

dBm

dB milliwatt

dBw

dB watt

DDoS

Distributed denial of service

DDR

Dial-on-demand routing

DEC

Digital Equipment Corporation

DES

Digital Encryption Standard

DESGN

Designing for Cisco Internetwork Solutions

DHCP

Dynamic Host Configuration Protocol

DHCPv6

DHCP for IPv6

DID

Direct Inward Dialing

DiffServ

Differentiated Services

DMVPN

Dynamic Multipoint VPN

Acronym

Expanded Term

DMZ

Demilitarized zone

DNS

Domain Name Service, or Domain Name System

DOCSIS

Data Over Cable Service Interface Specification

DoS

Denial of service

DPNSS

Digital Private Network Signaling System

DRED

Distributed random early detection

DS0

Digital signal level 0

DSCP

Differentiated Services Code Point

DSL

Digital subscriber line

DSLAM

DSL access multiplexer

DSP

Digital signal processor

DSS

Data Security Standard

DSTM

Dual-Stack Transition Mechanism

DSU

Data service unit

DTMF

Dual-tone multifrequency

DTP

Dynamic Trunking Protocol

DUAL

Diffusing Update Algorithm

DWDM

Dense Wavelength Division Multiplexing

E

Ear

E&M

recEive and transMit; sometimes also known as Ear and Mouth

E911

Enhanced 911

EAP

Extensible Authentication Protocol

EAP-FAST

EAP Flexible Authentication via Secure Tunneling

EAPoL

Extensible Authentication Protocol over LAN

EAP-TLS

EAP Transport Layer Security

EAP-TTLS

EAP Tunneled Transport Layer Security

EBGP

External BGP

ECN

Explicit congestion notification

EGP

Exterior Gateway Protocol

EIGRP

Enhanced Interior Gateway Routing Protocol

EIRP

Effective Isotropic Radiated Power

ERP

Enterprise resource planning

Acronym

Expanded Term

ES

End system

ESA

Extended service area

ESP

Encapsulating Security Payload

EtherIP

Ethernet in IP

ETSI

European Telecommunications Standards Institute

EUI-64

Extended universal identifier 64-bit

FCC

Federal Communications Commission

FCIP

Fiber Channel over IP

FD

Feasible distance

FDM

Frequency division multiplexing

FEC

Forwarding Equivalence Class

FECN

Forward Explicit Congestion Notification

FIB

Forwarding Information Base

FICON

Fiber Connection

FLSM

Fixed-Length Subnet Masking

FQDN

Fully qualified domain name

FRR

Fast reroute

FRTS

Frame Relay Traffic Shaping

FS

Feasible successor

FWSM

Firewall Services Module

FX

Foreign exchange

FXO

Foreign Exchange Office

FXS

Foreign Exchange Station

Gbps

Gigabits per second

GE

Gigabit Ethernet

GLBA

U.S. Gramm-Leach-Bliley Act of 1999

GLBP

Gateway Load-Balancing Protocol

GoS

Grade of Service

GPRS

General Packet Radio Service

GPS

Global positioning system

GRE

Generic Routing Encapsulation

GSM

Global System for Mobile

Acronym

Expanded Term

GSS

Global Site Selector

GTC

Generic Token Card

GTS

Generic Traffic Shaping

HDLC

High-Level Data Link Control

HDSL

High-data-rate DSL

HDSL-2

Second generation of HDSL

HIDS

Host-based intrusion detection system

HIPAA

Health Insurance Portability and Accountability Act

HIPS

Host-based intrusion prevention system

HMAC

Hash-based Message Authentication Code

HMAC-MD5

Hash-based Message Authentication Code Message Digest 5

HMAC-SHA

Hash-based Message Authentication Code Secure Hash Algorithm

H-REAP

Hybrid Remote Edge AP

HSRP

Hot Standby Router Protocol

HSSI

High-speed serial interface

HTTPS

HTTP secured by SSL

HVAC

Heating, ventilation, and air conditioning

HWIC

High-speed WAN interface card

Hz

Hertz

IANA

Internet Assigned Numbers Authority

IAPP

Inter-Access Point Protocol

IBGP

Internal BGP

IBNS

Identity-Based Networking Services

ICMP

Internet Control Message Protocol

ID

Identifier

IDF

Intermediate distribution frame

IDM

Cisco Intrusion Prevention System Device Manager

IDS

Intrusion Detection System

IDSL

ISDN DSL

IEEE

Institute of Electrical and Electronics Engineers

IETF

Internet Engineering Task Force

IGMP

Internet Group Management Protocol

Acronym

Expanded Term

IGP

Interior gateway protocol

IGRP

Interior Gateway Routing Protocol

IIS

Internet Information Server

IKE

Internet Key Exchange

IPC

IP Communications

IPCC

IP Contact Center

IPFIX

IP Flow Information Export

IPS

Intrusion Prevention System

IPsec

Internet Protocol Security

IP/TV

Internet Protocol Television

IPv4

IP version 4

IPv6

IP version 6

IPX

Internetwork Packet Exchange

IS

Intermediate system

ISDN

Integrated Services Digital Network

IS-IS

Intermediate System-to-Intermediate System

IS-ISv6

IS-IS version 6

ISL

Inter-switch link

ISM

Industrial, Scientific, and Medical

ISP

Internet service provider

ISR

Integrated Services Router

ISSU

In-Service Software Upgrade

IVR

Interactive voice response

kbps

Kilobits per second

kHz

Kilohertz

km

Kilometer

L1

Level 1

L1/L2

Level 1/Level 2

L2

Layer 2

Level 2

L2F

Layer 2 Forwarding

L2TP

Layer 2 Tunneling Protocol

Acronym

Expanded Term

LAC

L2TP Access Concentrator

LACP

Link Aggregation Control Protocol

LAG

Link aggregation

LAPB

Link Access Procedure Balanced

LBS

Location-based services

LD-CELP

Low-Delay Code Excited Linear Prediction Compression

LDP

Label Distribution Protocol

LEAP

Cisco Lightweight Extensible Authentication Protocol

LFI

Link Fragmentation and Interleaving

LLC

Logical Link Control

LLQ

Low latency queuing

LNS

L2TP Network Server

LRE

Long-Reach Ethernet

LSA

Link-state advertisement

LSDB

Link-state database

LSP

Label Switched Path

Link-state packet

LSR

Label Switched Router

LSU

Link-state update

LWAPP

Lightweight AP Protocol

LZS

Lempel-Ziv Stack

M

Mouth

MAN

Metropolitan-area network

MAP

Mesh AP

MARS

Cisco Security Monitoring, Analysis, and Response System

MASc

Master's degree in applied science

Mbps

Megabits per second

MBSA

Microsoft Baseline Security Analyzer

MC

Multipoint controller

MCU

Multipoint control unit

MD5

Message Digest 5

MDS

Multilayer Directors and Fabric Switches

Acronym

Expanded Term

MGCP

Media Gateway Control Protocol

MHz

Megahertz

MIC

Message Integrity Check

MIR

Minimum information rate

MISTP

Multiple-Instance STP

MLP

Multilink Point-to-Point Protocol

MLS

Multilayer switching

MLSP

Multilayer Switching Protocol

MLS-RP

MLS Route Processor

MLS-SE

MLS Switching Engine

MM

Multimode

MoH

Music on hold

MOS

Mean opinion score

MP

Multilink Protocol

Multipoint processor

MP3

MPEG-1 Audio Layer 3

MPCC

Microsoft Point-to-Point Compression

MPEG

Moving Picture Experts Group

MPLS

Multiprotocol Label Switching

MPMLQ

Multipulse Maximum Likelihood Quantization

MPPP

Multilink Point-to-Point Protocol

MRTG

Multi-Router Traffic Grapher

ms

Milliseconds

MSB

Most significant bit

MSCHAPv2

Microsoft Challenge Handshake Authentication Protocol version 2

MTBF

Mean time between failures

MTTR

Mean time to repair

MTU

Maximum transmission unit

mW

Milliwatt

MW

Megawatt

MWI

Message Waiting Indicator

Acronym

Expanded Term

NAC

Network Admission Control

NAD

Network Access Device

NAM

Network Analysis Module

NANP

North American Numbering Plan

NAP

Network Access Provider

NAS

Network Attached Storage

Network Access Server

NAT

Network Address Translation

NAT-PT

NAT Protocol Translation

NBAR

Network-based application recognition

NBMA

Nonbroadcast multiaccess

NDS

Novell Directory Services

NEBS

Network Equipment Building System

NFC

NetFlow Collection Engine

NIC

Network interface card

NIDS

Network Intrusion Detection System

NIPS

Network-based intrusion prevention systems

NMS

Network management system

NOC

Network operations center

NPA

Numbering Plan Area

NSF

Nonstop Forwarding

NSP

Network Service Provider

NSSA

Not-so-stubby area

NTP

Network Time Protocol

OC

Optical carrier

ODR

On-Demand Routing

OFDM

Orthogonal Frequency Division Multiplexing

ONS

Optical Networking Solutions

OS

Operating system

OSI

Open Systems Interconnection

OSPF

Open Shortest Path First

OSPFv2

OSPF version 2

Acronym

Expanded Term

OSPFv3

OSPF version 3

OTAP

Over-the-Air Provisioning

OTP

One-time password

OUI

Organizational Unique Identifier

PAC

Protected Access Credential

PAgP

Port Aggregation Protocol

PAM

Pulse amplitude modulation

PAN

Personal-area network

PAT

Port Address Translation

PCI

Payment Card Industry

PCM

Pulse code modulation

PDA

Personal digital assistant

PDM

Protocol-Dependent Module

PDU

Protocol data unit

PE

Provider Edge

PEAP

Protected Extensible Authentication Protocol

PHY

Physical layer

PIM

Protocol-Independent Multicast

PIN

Personal identification number

PIPEDA

Canadian Personal Information Protection and Electronic Documents Act

PKC

Proactive Key Caching

PKI

Public key infrastructure

PMK

Pair-wise Master Key

PoE

Power over Ethernet

POP

Point of presence

POP3

Post Office Protocol version 3

POS

Packet over SONET/SDH

POTS

Plain old telephone service

PPDIOO

Prepare, Plan, Design, Implement, Operate, Optimize

PPPoA

PPP over ATM

PPPoE

PPP over Ethernet

pps

Packets per second

Acronym

Expanded Term

PPTP

Point-to-Point Tunneling Protocol

PQ

Priority queuing

PRC

Partial Route Calculation

PSK

Preshared key

PSQM

Perceptual Speech Quality Measurement

PSTN

Public switched telephone network

PTK

Pairwise Transient Key

PVC

Permanent virtual circuit

PVDM

Packet voice DSP module

PVST

Per-VLAN spanning tree

QoS

Quality of service

QPPB

QoS Policy Propagation on BGP

QSIG

Q Signaling

RAP

Rooftop AP

RARP

Reverse Address Resolution Protocol

RAS

Registration, Admission, and Status

RC4

Rivest Cipher 4

RDMA

Remote Data Memory Access

RDP

Router Discovery Protocol

REAP

Remote edge AP

RED

Random early detection

RF

Radio Frequency

RFI

Request for Information

RFP

Request for Proposal

RIP

Routing information protocol

RIPng

RIP new generation

RIPv1

Routing Information Protocol version 1

RIPv2

Routing Information Protocol version 2

RME

Resource Manager Essentials

RMON

Remote Monitoring

RMON2

Remote Monitoring 2

ROI

Return on Investment

Acronym

Expanded Term

RP

Rendezvous point

RPF

Reverse Path Forwarding

RPVST+

Rapid Per-VLAN Spanning Tree Plus, or RSTP with Per-VLAN Spanning Tree Plus

RRM

Radio resource management

RSP

Route Switch Processor

RSSI

Received signal strength indicator

RSTP

Rapid Spanning Tree Protocol

RSVP

Resource Reservation Protocol

RTCP

Real-time Transport Control Protocol

RTP

Real-time Transport Protocol

RTS

Request to send

RTT

Round-trip time

SAA

Service assurance agent

SAINT

Security Administrator's Integrated Network Tool

SAN

Storage area network

SCCP

Skinny Client Control Protocol

SCP

Secure Copy

SDF

Signature definition file

SDH

Synchronous Digital Hierarchy

SDM

Security Device Manager

SDP

Site Data Protection

SDSL

Symmetric DSL

SEC

U.S. Securities and Exchange Commission

SFP

Small Form Factor Pluggable

SFS

Server Fabric Switching

SFTP

SSH FTP

SIP

Session Initiation Protocol

SLA

Service level agreement

SM

Single-mode

SMDS

Switched Multimegabit Data Services

SMI

Structure of Management Information

SMTP

Simple Mail Transfer Protocol

Acronym

Expanded Term

SNA

Systems Network Architecture

SNAP

Subnetwork access protocol

SNMP

Simple Network Management Protocol

SNMPv1

SNMP version 1

SNMPv2

SNMP version 2

SNMPv3

SNMP version 3

SNR

Signal-to-noise ratio

SOA

Service-oriented architecture

SOHO

Small office, home office

SONA

Service-Oriented Network Architecture

SOX

U.S. Sarbanes-Oxley Act of 2002

SP

Service provider

SPA

Shared Port Adapter

SPF

Shortest path first

SRST

Survivable Remote Site Telephony

SRTP

Secure Real-Time Transport Protocol

SS7

Signaling System 7

SSH

Secure Shell

SSID

Service Set Identifier

SSL

Secure Sockets Layer

SSO

Stateful Switchover

STAC

Stacker

STP

Spanning Tree Protocol

SVC

Switched virtual circuit

TCO

Total cost of ownership

TDM

Time-division multiplexing

TDMA

Time division multiple access

TKIP

Temporal Key Integrity Protocol

TLV

Type, length, value

ToS

Type of service

TTL

Time to live

Acronym

Expanded Term

UA

User agent

UAC

UA client

UAS

UA server

uBR

Universal Broadband Router

UDLD

Unidirectional Link Detection

UDP

User Datagram Protocol

U/L

Universal/Local

UMTS

Universal Mobile Telephone Service

UNII

Unlicensed National Information Infrastructure

URI

Uniform Resource Identifier

uRPF

Unicast Reverse Path Forwarding

USB

Universal Serial Bus

UTP

Unshielded twisted-pair

UWN

Unified Wireless Network

V

Volt

v9

Version 9

VACM

View-based Access Control Model

VAD

Voice activity detection

VC

Virtual circuit

VDSL

Very-high-data-rate DSL

VIP

Versatile Interface Processor

VLSM

Variable-length subnet mask

VMPS

VLAN Membership Policy Server

VMS

VPN/Security Management Solution

VoATM

Voice over ATM

VoD

Video on demand

VoFR

Voice over Frame Relay

VoIP

Voice over IP

VoWLAN

Voice calls over a WLAN

VPDN

Virtual private dialup network

VPN

Virtual Private Network

VRRP

Virtual Router Redundancy Protocol

VTP

VLAN Trunking Protocol

Acronym

Expanded Term

W

Watt

WAAS

Wide-Area Application Services

WAE

Wide-Area Application Engine

WAFS

Wide-Area File Services

WAP

Wireless access point

WCS

Wireless Control System

WEP

Wired Equivalent Privacy

WFA

Wi-Fi Alliance

WFQ

Weighted fair queuing

WIC

WAN interface card

WiSM

Wireless Services Module

WLAN

Wireless LAN

WLANA

WLAN Association

WLC

WLAN controller

WLCM

Cisco WLC module

WLSE

Wireless LAN Solutions Engine

WoW

Workstation on wheels

WPA

Wi-Fi Protected Access

WRED

Weighted random early detection

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