Acronym Expanded Term
Acronym Expanded Term
3DES Triple DES
6-to-4 IPv6-to-IPv4
AAA Authentication, authorization, accounting
ABR Area Border Router
ACK 1. acknowledge
2. acknowledgment
3. acknowledgment bit in a TCP segment
ACL access control list
ACS Access Control Server
AD advertised distance
ADSL asymmetric DSL
AES Advanced Encryption Standard
AfriNIC African Network Information Centre
AH Authentication Header
ALG application layer gateway
ANSI American National Standards Institute
AON Application-Oriented Networking
API application programming interface
APNIC Asia Pacific Network Information Center
ARCNET Attached Resource Computer Network
ARIN American Registry for Internet Numbers
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ARP Address Resolution Protocol
AS autonomous system
ASA Adaptive Security Appliance
ASBR Autonomous System Boundary Router
ATM Asynchronous Transfer Mode
AToM Any Transport over MPLS
BDR Backup Designated Router
BGP Border Gateway Protocol
BGPv4 or BGP-4 BGP Version 4
BIS Bump-in-the-Stack
BPDU bridge protocol data unit
bps bits per second
BRI Basic Rate Interface
BSCI Building Scalable Cisco Internetworks
CATV community antenna television
CBAC context-based access control
CCDP Cisco Certified Design Professional
CCNA Cisco Certified Network Associate
CCNP Cisco Certified Network Professional
CCSP Cisco Certified Security Professional
CDP Cisco Discovery Protocol
CE Customer Edge
CEF Cisco Express Forwarding
CEFv6 Cisco Express Forwarding for IPv6
CIDR classless interdomain routing
CIR committed information rate
CMTS Cable modem termination system
CO Central office
CoS class of service
CPE customer provider edge
customer premise equipment
CPU central processing unit
CSM Cisco Security Manager
CSMA/CD carrier sense multiple access collision detect
DAD Duplicate address detection
DBD database description packets
DDP database description packets
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Acronyms and Abbreviations 3
DES Data Encryption Standard
DESGN Designing for Cisco Internetwork Solutions
DHCP Dynamic Host Configuration Protocol
DHCPv6 DHCP for IPv6
DiffServ Differentiated Services
DLCI data-link connection identifier
DMVPN Dynamic multipoint VPN
DNA DoNotAge
DNS Domain Name Service or Domain Name System
DoD Department of Defense
DR designated router
DSL digital subscriber line
DSLAM DSL access multiplexer
DUAL Diffusing Update Algorithm
E1 External Type 1
E2 External Type 2
EAP Extensible Authentication Protocol
EBGP External BGP
e-bit external bit
EGP Exterior Gateway Protocol
EIGRP Enhanced Interior Gateway Routing Protocol
EoMPLS Ethernet over MPLS
ESP Encapsulating Security Payload
EUI-64 extended universal identifier 64-bit
FD feasible distance
FCAPS Fault, Configuration, Accounting, Performance, and Security
FDDI Fiber Distributed Data Interface
FEC forwarding equivalence class
FIB Forwarding Information Base
FLSM fixed-length subnet mask
FS feasible successor
FTP File Transfer Protocol
Gbps gigabits per second
GET Group encrypted transport
GRE Generic Routing Encapsulation
HDLC High-Level Data Link Control
HFC hybrid fiber-coaxial
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HSRP Hot Standby Router Protocol
HTTP Hypertext Transfer Protocol
Hz hertz
IANA Internet Assigned Numbers Authority
IBGP Internal BGP
ICMP Internet Control Message Protocol
ID identifier
IDP initial domain part
IDRP Interdomain Routing Protocol
IEEE Institute of Electrical and Electronics Engineers
IETF Internet Engineering Task Force
IGMP Internet Group Management Protocol
IGP Interior Gateway Protocol
IGRP Interior Gateway Routing Protocol
IIN Intelligent Information Network
IKE Internet Key Exchange
IntServ Integrated Services
IOS Internet Operating System
IP Internet Protocol
IPCP Internet Protocol Control Protocol
IPM Internetwork Performance Monitor
IPsec IP security
IPv4 IP Version 4
IPv6 IP Version 6
IPX Internetwork Packet Exchange
IS 1. information systems
2. intermediate system
ISAKMP Internet Security Association and Key Management Protocol
ISATAP Intra-Site Automatic Tunnel Addressing
IS-IS Intermediate System-to-Intermediate System
IS-ISv6 IS-IS for IPv6
ISDN Integrated Services Digital Network
ISO International Organization for Standardization
ISP Internet service provider
ISR integrated services router
ITIL IT Infrastructure Library
ITU-T International Telecommunication Union Telecommunication
Standardization Sector
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Acronyms and Abbreviations 5
kbps kilobits per second
L3 Level 3
LACNIC Latin American and Caribbean IP Address Regional Registry
LAN local-area network
LANE LAN Emulation
LS link state
LSA link-state advertisement
LSAck link-state acknowledgment
LSDB link-state database
LSP link-state packet
LSR link-state request
LSU link-state update
M metric
MAC Media Access Control
MAN metropolitan-area network
MB megabyte
MBGP Multiprotocol BGP
Mbps megabits per second
MD5 message digest algorithm 5
MED Multi-Exit-Discriminator
MIB Management Information Base
MLD Multicast Listener Discovery
MOSPF Multicast OSPF
MP-BGP4 Multiprotocol Border Gateway Protocol Version 4
MPLS Multiprotocol Label Switching
ms Millisecond
MTU maximum transmission unit
NA Neighbor advertisement
NAC Network Admission Control
NAT Network Address Translation
NAT-T NAT Traversal
NAT-PT NAT-Protocol Translation
NBMA nonbroadcast multiaccess
NCP Network control protocol
ND Neighbor discovery
NLRI Network Layer Reachability Information
NMS Network Management System
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NS Neighbor solicitation
NSSA not-so-stubby area
NTP Network Time Protocol
ODR on-demand routing
OER Optimized Edge Routing
OS operating system
OSI Open System Interconnection
OSPF Open Shortest Path First
OSPFv2 OSPF Version 2
OSPFv3 OSPF Version 3
OUI organizationally unique identifier
P2P Point-to-point
PAT Port Address Translation
PBR policy-based routing
PBX Private Branch Exchange
PDM protocol-dependent module
PDU protocol data unit
PE Provider Edge
POP point of presence
POTS plain old telephone service
PPDIOO Prepare, Plan, Design, Implement, Operate, Optimize
PPP Point-to-Point Protocol
PPPoA PPP over ATM
PPPoE PPP over Ethernet
pps packets per second
PPTP Point-to-Point Tunneling Protocol
PRI Primary Rate Interface
PSTN public switched telephone network
PVC permanent virtual circuit
QoS quality of service
RA Router advertisement
RF Radio frequency
RFC Request For Comments
RIB Routing Information Base
RIP Routing Information Protocol
RIPE-NCC Réseaux IP Européens-Network Coordination Center
RIPng Routing Information Protocol new generation
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Acronyms and Abbreviations 7
RIPv1 Routing Information Protocol Version 1
RIPv2 Routing Information Protocol Version 2
RIR Regional Internet registries
RPF Reverse Path Forwarding
RR route reflector
RRI reverse route injection
RS Router solicitation
RSVP Resource Reservation Protocol
RTO retransmit timeout
RTP Reliable Transport Protocol
RTT round-trip time
RTTMON Round-Trip Time Monitor
SA security association
SDSL Symmetric DSL
SHA Secure hash
SHDSL single-pair high-speed DSL
SIA stuck in active
SIN ships in the night
SLAs Service level agreements
SM source metric
SMTP Simple Mail Transfer Protocol
SNAP Subnetwork Access Protocol
SNMP Simple Network Management Protocol
SOHO small office/home office
SONA Service-Oriented Network Architecture
SP Service Provider
SPF shortest path first
SPT shortest path tree
SPX Sequenced Packet Exchange
SRTT smooth round-trip time
ssh secure shell
SSL Secure socket layer
STP 1. shielded twisted-pair 2. Spanning Tree Protocol
SVC switched virtual circuit
SYN Synchronize
TCP Transmission Control Protocol
TCP/IP Transmission Control Protocol/Internet Protocol
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TFTP Trivial File Transfer Protocol
TLV Type, Length, Value
TMN Telecommunications Management Network
ToS type of service
TTL Time To Live
UDP User Datagram Protocol
U/L Universal/Local
URL Uniform Resource Locator
UTP unshielded twisted-pair
VC virtual circuit
VDSL very high bitrate DSL
VLAN virtual LAN
VLSM variable-length subnet mask
VoD video on demand
VoIP Voice over IP
VPN virtual private network
VRF VPN routing and forwarding
VT video telephony
VTI Virtual tunnel interface
VTP VLAN Trunking Protocol
vty virtual terminal
WAN wide-area network
WAAS Wide Area Application Services
WCCP Web Cache Communications Protocol
WFQ weighted fair queuing
WiMAX Worldwide Interoperability for Microwave Access
WLAN wireless LAN
WRED weighted random early detection
WWW World Wide Web
ZBF zone-based firewall
WAN Wide Area Network
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