| 2.5G | next -generation |
| 3G | third-generation |
| ABR | area border router |
| ACL | access control list |
| ADM | add-drop multiplexer |
| AN | acknowledgment number |
| API | application programming interface |
| APS | automatic protection switching |
| ARP | Address Resolution Protocol |
| AS | autonomous system |
| ASBR | autonomous system border router |
| ASIC | application-specific integrated circuit |
| ASN | abstract syntax notation |
| AT | address table |
| ATM | Asynchronous Transfer Mode |
| BDR | backup Designated Router |
| BERT | bit error rate test |
| BGP | Border Gateway Protocol |
| BGP4 | Border Gateway Protocol version 4 |
| BSR | Bootstrap router |
| CBGP | confederation BGP |
| CBR | constant bit rate |
| CBT | core -based tree |
| CCC | circuit cross connect |
| CCSI | Cisco Certified System Instructor |
| CE | customer edge |
| Chk | checksum |
| CIDR | classless interdomain routing |
| CIP | connector interface panel |
| CLI | command-line interface |
| CLNP | Connectionless Network Protocol |
| CLP | cell loss priority |
| CMTS | Cable Modem Termination System |
| Co | control |
| CoS | class of service |
| cps | cell per second |
| CPU | central processing unit |
| CRC | cyclical redundancy check |
| CRU | central routing unit |
| CSNP | complete SNP |
| CSPF | Constrained Shortest Path First |
| DA | destination IP address |
| DBM | distributed buffer manager |
| DHCP | Dynamic Host Configuration Protocol |
| DIET | designing, implementing, executing, and testing |
| DiffServ | Differentiated Services |
| DLCI | data link connection identifier |
| DNS | domain name server |
| DO | data offset |
| DoS | denial of service |
| DP | destination port |
| DR | Designated Router |
| DS | Differentiated Services; digital stream |
| DS-0 | digital stream-0 |
| DSCP | differential service code point |
| DSP | domain specific Part |
| EBGP | External Border Gateway Protocol |
| ECMP | equal cost multipath |
| EGP | Exterior Gateway Protocol |
| ERO | explicit route object |
| FCS | frame check sequence |
| FEB | forwarding engine board |
| FEM | forwarding engine module |
| FPC | flexible PIC concentrator |
| FSM | finite state machine |
| FTP | File Transfer Protocol |
| GFC | generic flow control |
| GGSN | gateway GPRS support node |
| GigE | gigabit Ethernet |
| GRE | generic route encapsulation |
| HC | header checksum |
| HP-NNM | Hewlett-Packard's Network Node Manager |
| HTTP | Hyper Text Transfer Protocol |
| IBGP | Internal BGP |
| ICMP | Internet Control Message Protocol |
| ID | identification |
| IETF | Internet Engineering Task Force |
| IGMP | Internet Group Management Protocol |
| IGP | Interior Gateway Protocol |
| IHL | IP header length |
| ILMI | integrated local management interface |
| IntServ | Integrated Services |
| IP | Internet Protocol |
| IP/ATM | Internet Protocol over Asynchronous Transfer Mode |
| IPv4 | Internet Protocol version 4 |
| IPv6 | Internet Protocol version 6 |
| IR | internal router |
| IRR | Internet routing registry |
| IS-IS | Intermediate System-to-Intermediate System |
| ISO | International Standards Organization |
| ISP | Internet service provider |
| J-cell | 64-byte block |
| JNAI | Juniper Networks Authorized Instructor |
| JNCIE | Juniper Networks Certified Internet Expert |
| JNCIS | Juniper Networks Certified Internet Specialist |
| JNNTC | Juniper Networks Technical Certification Program |
| JTAC | Juniper Technical Assistance Center |
| JUNOS | Juniper Network Operating System |
| L1/2 | level 1/2 |
| L2VPN | Layer 2 virtual private network |
| LAN | local area network |
| LDP | Label Distribution Protocol |
| Len | length |
| LH | long haul |
| LMI | local management interface |
| LSA | link-state advertisement |
| LSDB | link state database |
| LSP | label switched path; link state PDU |
| LSR | label switching router |
| M | management bit |
| MAN | metropolitan area network |
| MBGP | Multicast BGP |
| mbone | multicast backbone |
| MCS | miscellaneous control Subsystem |
| MD5 | message digest |
| MED | MULTI_EXIT_DISC |
| MIB | management information base |
| MOSPF | Multicast Open Shortest Path First |
| MPLS | multiprotocol label switching |
| MSDP | Multicast Routing Protocol Protocol |
| MTBF | mean time between failure |
| MTU | maximum transmission unit |
| NBMA | nonbroadcast multiaccess |
| NET | network entity title |
| NIC | network information center; network interface card |
| NLPID | Network Layer Protocol ID |
| NLRI | network layer reachability information |
| NLSP | NetWare Link State Routing Protocol |
| NMS | network management station or system |
| NNI | network node interface |
| NSAP | network service access point |
| NSSA | not-so-stubby area |
| NTP | Network Time Protocol |
| OC | optical carrier |
| OID | object identifier |
| Opt | option |
| OSI | open systems interconnection |
| OSPF | Open Shortest Path First |
| P | protocol; provider |
| PCG | PFE clock generator |
| PCR | peak cell rate |
| PDU | protocol data unit |
| PE | provider edge |
| PFE | packet forwarding engine |
| PFM | packet forwarding module |
| PHP | penultimate hop Popping |
| PIC | physical interface card |
| PIM-DM | Protocol Independent Multicast ”Dense Mode |
| PIM-SM | Protocol Independent Multicast-Sparse Mode |
| POS | Packet over SONET |
| PPP | Point-to-Point Protocol |
| PSNP | partial SNP |
| PT | payload type |
| p-t-p | point-to-point |
| PVC | permanent virtual circuit |
| QoS | quality of service |
| RADB | route arbiter database |
| RD | route distinguisher |
| RE | routing engine |
| RED | random early detection |
| Res | reserved |
| RFC | request for comment |
| RIB | routing information base |
| RID | router identification |
| RIP | Routing Information Protocol |
| RMA | return merchandise authorization |
| RP | rendezvous point |
| RPM | reverse path multicasting |
| RPSL | routing policy specification language |
| RSVP | Resource Reservation Protocol |
| RSVP-TE | RSVP with traffic engineering extensions |
| RTM | routing table manager |
| SA | source active; source IP address |
| SAP | Session Announcement Protocol |
| SAP/SDP | Session Announcement Protocol/Session Description Protocol |
| SAR | segmentation and reassembly |
| SCP | Secure Copy Protocol |
| SCR | sustained cell rate |
| SDH | Synchronous Digital Hierarchy |
| SDP | Session Description Protocol |
| SE | system engineer |
| SFD | start of frame delimiter |
| SFM | switching and forwarding module |
| SGMP | Standard Gateway Monitoring Protocol |
| SLIP | Serial Line Internet Protocol |
| SN | sequence number |
| SNA | systems network architecture |
| SNMP | Simple Network Management Protocol |
| SNP | sequence number packet |
| SONET | Synchronous Optical Network |
| SP | source port |
| SPE | synchronous payload envelope |
| SPF | shortest path first |
| SSB | system and switch Board |
| SSH | secure shell |
| STM | synchronous transport module |
| STS | synchronous transport signal |
| SVC | switched virtual circuit |
| TACACS+ | Terminal Access Controller Access Control System + |
| TCP | Transmission Control Protocol |
| TCP/IP | Transmission Control Protocol over Internet Protocol |
| TDM | time division multiplexing |
| TED | traffic-engineering database |
| TL | total Length |
| TNP | Trivial Network Protocol |
| ToS | type of service |
| TTL | time to live |
| UBR | unspecified bit rate |
| UDP | User Datagram Protocol |
| UHP | ultimate hop popping |
| UID | user identifier |
| UNI | user-network interface |
| UP | urgent pointer |
| UTP | unshielded twisted pair |
| v | version |
| VBR | variable bit rate |
| VCI | virtual channel identifier |
| VLSM | variable length subnet masks or masking |
| VPI | virtual path identifier |
| VPN | virtual private network |
| VRF | virtual routing and forwarding |
| VRRP | Virtual Router Redundancy Protocol |
| VSA | vendor specific attribute |
| VT | virtual tributarie |
| WAN | wide-area network |
| WRED | Weighted RED |
| XML | extensible markup language |
| XNS | Xerox Network Systems |
