Interested in the field of computer and network security? One important aspect you’ll need to know about is routing and switching. Routing and switching are the two main functions of a network. Their purpose is to connect the different segments of your network infrastructure.
The following list decodes all the abbreviations related to Routing and Switching.
| 1 | 10 GEA | 10 Gigabit Ethernet Alliance |
| 2 | AAL | ATM Adaptation Layer |
| 3 | AARP | AppleTalk Address Resolution Protocol |
| 4 | ABM | Asynchronous Balanced Mode |
| 5 | ABR | Area Border Routers |
| 6 | ABR | Available Bit Rate |
| 7 | ABR RM | Resource Management |
| 8 | ABT | ATM Block Transfer |
| 9 | ACK | Acknowledgment |
| 10 | ACR | Allowed Current Rate |
| 11 | ACR | Automatic Call Routing |
| 12 | ACSE | Association Control Service Element |
| 13 | ADMs | Add/Drop Multiplexer |
| 14 | ADSP | AppleTalk Data Stream Protocol |
| 15 | AEP | AppleTalk Echo Protocol |
| 16 | AF | Assured Forwarding |
| 17 | AFI | Authority and Format Identifier |
| 18 | AFP | AppleTalk Filing Protocol |
| 19 | ANSI | American National Standards Institute |
| 20 | AON | All-Optical Network |
| 21 | APAP | AppleTalk Printer Access Protocol |
| 22 | APNIC | Asia Pacific Network Information Center |
| 23 | APPN | Advanced Peer-to-Peer Networking |
| 24 | APS | Automatic Protection Switching |
| 25 | ARE | All Routes Explorer |
| 26 | ARIN | American Registry for Internet |
| 27 | ARIS | Aggregated Route-Based IP Switching |
| 28 | ARM | Asynchronous Response Mode |
| 29 | ARP | Address Resolution Protocol |
| 30 | ASBR | Autonomous System Border Router |
| 31 | ASIC | Application-Specific Integrated Circuits |
| 32 | ASN.1 | Abstract Syntax Notation One |
| 33 | ASP | AppleTalk Session Protocol |
| 34 | ATM | Asynchronous Transmission Mode |
| 35 | ATP | AppleTalk Transaction Protocol |
| 36 | AURP | AppleTalk Update-based Routing Protocol |
| 37 | AWG | American Wire Gauge |
| 38 | BA | Bandwidth Allocator |
| 39 | BACP | Bandwidth Allocation Control Protocol |
| 40 | BAP | Bandwidth Allocation Protocol |
| 41 | BC | committed Burst |
| 42 | BCP | Best Current Practice |
| 43 | BCP | Bridging Control Protocol |
| 44 | BDR | Backup Designated Router |
| 45 | BE | Excess Burst |
| 46 | BECN | Backward Explicit Congestion Notification |
| 47 | BER | Basic Encoding Rules |
| 48 | BGP | Border Gateway Protocol |
| 49 | BIA | Burnt In Address |
| 50 | B-ICI | Broadband Isdn Inter-Carrier Interface |
| 51 | BID | Bridge Identifier |
| 52 | BIS | Border Intermediate System |
| 53 | B-ISDN | Broadband ISDN |
| 54 | BLSR | Bidirectional Line-Switched Ring |
| 55 | BPDU | Bridge Protocol Data Unit |
| 56 | BRI | Basic Rate Interface |
| 57 | BS | Burst Size |
| 58 | BSD | Berkeley Software Distribution |
| 59 | BUS | Broadcast and Unknown Server |
| 60 | BWIF | Broadband Wireless Internet Forum |
| 61 | CAC | Call Admission Control |
| 62 | CAM | Content-Addressable Memory |
| 63 | CAR | Committed Access Rate |
| 64 | CBDS | Connectionless Broadband Data Service |
| 65 | CBQ | Class Based Queuing |
| 66 | CBR | Constant Bit Rate |
| 67 | CBT | Core Based Tree |
| 68 | CCITT | International Telephone and Telegraph Consultative Committee |
| 69 | CCP | Compression Control Protocol |
| 70 | CCS | Common Channel Signaling |
| 71 | CDDI | Copper Data Distributed Interface |
| 72 | CDVT | Cell Delay Variation Tolerance |
| 73 | CE | Customer Edge |
| 74 | CEF | Cisco Express Forwarding |
| 75 | CEN | Comite Europeen de Normalisation |
| 76 | CENELEC | Comite Europeen de Normalisation Electrotechnique |
| 77 | CHAP | Challenge Handshake Authentication Protocol |
| 78 | CIDR | Classless Inter-Domain Routing |
| 79 | CIF | Cells in Frames |
| 80 | CIR | Committed Information Rate |
| 81 | CLIP | Classical IP over ATM |
| 82 | CLNP | Connection Less Network Protocol |
| 83 | CLNS | Connection Less Network Service |
| 84 | CLP | Cell Loss Priority |
| 85 | CLR | Cell Loss Ratio |
| 86 | CMIP | Common Management Information Protocol |
| 87 | CMIS | Common Management Information Services |
| 88 | CMNP | Connection-Mode Network Protocol |
| 89 | COI | Community Of Interest |
| 90 | CONS | Connection-Oriented Network Service |
| 91 | COPS | Common Open Policy Service |
| 92 | CoS | Class of Service |
| 93 | CPE | Customer Premises Equipment |
| 94 | CR | Constraint-Based Routing |
| 95 | CRC | Cyclic Redundancy Check |
| 96 | CR-LDP | Constraint Routed Label Distribution Protocol |
| 97 | CS | Convergence Sub layer |
| 98 | CSMA/CA | Carrier Sense Multiple Access with Collision Avoidance |
| 99 | CSMA/CD | Carrier Sense Multiple Access with Collision Detection |
| 100 | CSNP | Complete Sequence Number Packet |
| 101 | CSPF | Constraint-based Shortest Path First |
| 102 | CSR | Cell Switch Router |
| 103 | CUG | Closed User Group |
| 104 | DAC | Dual Attached Concentrator |
| 105 | DAS | Dual Attached Station |
| 106 | DCC | Data Country Code |
| 107 | DCE | Data Circuit-Terminating Equipment |
| 108 | DCEF | Distributed Cisco Expert Forwarding |
| 109 | DDCMP | Digital Data Communications Message Protocol |
| 110 | DDP | Datagram Delivery Protocol |
| 111 | DDR | Dial-on-Demand Routing |
| 112 | DB | Default Behavior |
| 113 | DE | Discard Eligibility |
| 114 | DES | Data Encryption Standard |
| 115 | DNIC | Data Network Identification Code |
| 116 | DQDB | Distributed Queue Dual Bus |
| 117 | DR | Designated Router |
| 118 | DRAM | Dynamic Random Access Memory |
| 119 | DRP | Decent Routing Protocol |
| 120 | DS | Directory Services |
| 121 | DSAP | Destination Service Access Point |
| 122 | DSBM | Designated Subnet Bandwidth Manager |
| 123 | DSCP | Differentiated Services Code Point |
| 124 | DSP | Domain Specific Part |
| 125 | DS-TE | DiffServ-aware Traffic Engineering |
| 126 | DSU | Digital Service Units |
| 127 | DTE | Data Terminal Equipment |
| 128 | DTL | Designated Transit Lists |
| 129 | DUAL | Diffusing Update Algorithm |
| 130 | DVMRP | Distance Vector Multicast Routing Protocol |
| 131 | DWDM | Dense Wavelength-Division Multiplexing |
| 132 | DXI | Digital exchange Interface |
| 133 | EA | Extended Address |
| 134 | EBGP | External Border Gateway Protocol |
| 135 | ECMP | Equal-Cost Multipath |
| 136 | ECMPR | Equal-Cost Multipath Routing |
| 137 | ECP | Encryption Control Protocol |
| 138 | EF | Expedited Forwarding |
| 139 | EFCI | Explicit Forward Congestion Indication |
| 140 | EGP | Exterior Gateway Protocol |
| 141 | EIA | Electronics Industry Association |
| 142 | EIGRP | Enhanced Interior Gateway Routing Protocol |
| 143 | EIR | Excess Information Rate |
| 144 | ELAP | Ether talk Link Access Protocol |
| 145 | ELSR | Edge Label Switching Router |
| 146 | EP | Error Protocol |
| 147 | EPD | Early Packet Discard |
| 148 | ERC | Explicit Rate Control |
| 149 | ERP | Enterprise Resource Planning |
| 150 | ES | End System |
| 151 | ESI | End System Identifier |
| 152 | ES-IS | End System to Intermediate System |
| 153 | ETSI | European Telecommunications Standards Institute |
| 154 | FM | Functional Address Indicator |
| 155 | FANP | Flow Attribute Notification Protocol |
| 156 | FC | Fiber Channel |
| 157 | FCAPS | Fault, Configuration, Accounting, Performance, Security |
| 158 | FCFS | First-Come First-Served |
| 159 | FCIA | Fiber Channel Industries Association |
| 160 | FCS | Frame Check Sequence |
| 161 | FDDI | Fiber Distributed Data Interface |
| 162 | FDM | Frequency Division Multiplexing |
| 163 | FDR | Full-Duplex Repeater |
| 164 | FEC | Forwarding Equivalence Class |
| 165 | FECN | Forward Explicit Congestion Notification |
| 166 | FF | Fixed Filter |
| 167 | FIB | Forwarding Information Base |
| 168 | FIFO | First-In First-Out |
| 169 | FLAP | Fdditalk Link Access Protocol |
| 170 | FLP | Fast Link Pulse |
| 171 | FPS | Frames per second |
| 172 | FRAD | Frame Relay Access Device |
| 173 | FRF | Frame Relay Forum |
| 174 | FRTS | Frame Relay Traffic Shaping |
| 175 | FTAM | File Transfer, Access, and Management |
| 176 | FUNI | Frame User-Network Interface |
| 177 | GARP | Generic Attribute Registration Protocol |
| 178 | GCRA | Generic Cell Rate Algorithm |
| 179 | GFC | Generic Flow Control |
| 180 | GFI | General Format Identifier |
| 181 | GIP | GARP Information Propagation |
| 182 | GMPLS | Generalized MPLS |
| 183 | GMRP | GARP Multicast Registration Protocol |
| 184 | GOLR | Gateway of Last Resort |
| 185 | GRE | Generic Routing Encapsulation |
| 186 | GSMP | General Switch Management Protocol |
| 187 | GTS | Generic Traffic Shaping |
| 188 | GVRP | GARP VLAN Registration Protocol |
| 189 | HDLC | High-Level Data Link Control |
| 190 | HEC | Header Error Control |
| 191 | HOL | Head of Line |
| 192 | HRW | Highest Random Weight |
| 193 | HSRP | Hot Standby Router Protocol |
| 194 | HSTR | High-Speed Token Ring |
| 195 | HSTRA | High-Speed Token Ring Alliance |
| 196 | HTTP | Hyper Text Transfer Protocol |
| 197 | IAB | Internet Architecture Board |
| 198 | IBGP | Internal BGP |
| 199 | ICD | International Code Designator |
| 200 | ICMP | Internet Control Message Protocol |
| 201 | ICP | Internet Control Protocol |
| 202 | IDI | Initial Domain Identifier |
| 203 | IDN | International Data Numbers |
| 204 | IDP | Initial Domain Part |
| 205 | IDP | Internet Datagram Protocol |
| 206 | IDRP | Inter-Domain Routing Protocol |
| 207 | IE | Information Element |
| 208 | IEC | International Electro technical Commission |
| 209 | IEEE | Institute of Electrical and Electronics Engineers |
| 210 | IESG | Internet Engineering Steering Group |
| 211 | IETF | Internet Engineering Task Force |
| 212 | IFMP | Ipsilon Flow Management Protocol |
| 213 | IGMP | Internet Group Management Protocol |
| 214 | IGP | Interior Gateway Protocol |
| 215 | ISP | Internet Service Provider |
| 216 | ILMI | Interim Local Management Interface |
| 217 | IPM | Internet Protocol Multicast |
| 218 | I-PNNI | Integrated-PNNI |
| 219 | IPX | Internet Packet exchange |
| 220 | IRDA | InfraRed Data Association |
| 221 | IRDP | ICMP Router Discovery Protocol |
| 222 | IRTF | Internet Research Task Force |
| 223 | ISDN | Integrated Services Data Network |
| 224 | IS-IS | Intermediate System-to-Intermediate System |
| 225 | ISL | Inter-Switch Link |
| 226 | ISO | International Organization for Standardization |
| 227 | ISOC | Internet Society |
| 228 | ISP | Internet Service Provider |
| 229 | ISR | Integrated Switch Router |
| 230 | ISUP | ISdn User Part |
| 231 | ITU-T | International Telecommunications Union Telecommunications Standardization Sector |
| 232 | IWF | InterWorking Function |
| 233 | IWU | InterWorking Unit |
| 234 | JET | Just-Enough-Time |
| 235 | L2TP | Layer 2 Tunneling Protocol |
| 236 | LAG | Local Address Group |
| 237 | LAN | Local Area Network |
| 238 | LANE | LAN Emulation |
| 239 | LAP | Link Access Procedure |
| 240 | LAPB | Link Access Procedure, Balanced |
| 241 | LAPD | Link Access Protocol on D-Channel |
| 242 | LAT | Local Area Transport |
| 243 | LCI | Logical Channel Identifier |
| 244 | LCP | Link Control Protocol |
| 245 | LDP | Label Distribution Protocol |
| 246 | LEC | LAN Emulation Client |
| 247 | LECS | LAN Emulation Configuration Server |
| 248 | LES | LAN Emulation Server |
| 249 | LIFO | Last-In First-Out |
| 250 | LIS | Logical IP Subnets |
| 251 | LLAP | Localtalk Link Access Protocol |
| 252 | LLC | Logical Link Control Sublayer |
| 253 | LLQ | Low Latency Queuing |
| 254 | LMI | Local Management Interface |
| 255 | LMP | Link Management Protocol |
| 256 | LSA | Link-State Advertisements |
| 257 | LSAP | LLC Service Access Point |
| 258 | LSDB | Link-State Database |
| 259 | LSP | Label Switched Path |
| 260 | LSP | Link-State Packet |
| 261 | LSR | Label Switching Router |
| 262 | LVC | Label Virtual Circuit |
| 263 | MAC | Media Access Control |
| 264 | MAN | Metropolitan Area Network |
| 265 | MANET | Mobile Ad Hoc Network |
| 266 | MARS | Multicast Address Resolution Server |
| 267 | MBGP | Multicast Border Gateway Protocol |
| 268 | MCR | Minimum Cell Rate |
| 269 | MDR | Multiple Destination Routing |
| 270 | MED | Multi-Exit Discriminator attribute |
| 271 | MEMS | Micro-Electro Mechanical Systems |
| 272 | MHS | Message Handling Systems |
| 273 | MHSRP | Multiple Hot Standby Router Protocol |
| 274 | MIB | Management Information Base |
| 275 | MLPPP | Multilink Point-to-Point Protocol |
| 276 | MLS | Multilayer Switching |
| 277 | MOP | Maintenance Operations Protocol |
| 278 | MOSPF | Multicast OSPF |
| 279 | MPC | MPOA Clients |
| 280 | MPLS | Multiprotocol Label Switching |
| 281 | MPXS | Multiprotocol Lambda Switching |
| 282 | MPOA | Multi-Protocol over ATM |
| 283 | MPPE | Microsoft Point-to-Point Encryption |
| 284 | MPR | Multipoint Relay |
| 285 | MPS | MPOA Server |
| 286 | MSAU | MultiStation Access Unit |
| 287 | MSDP | Multicast Source Discovery Protocol |
| 288 | MSF | Multiservice Switching Forum |
| 289 | MST | Mono Spanning Tree |
| 290 | MLPPP | Multilink PPP |
| 291 | MZAP | Multicast scope Zone Announcement Protocol |
| 292 | NANP | North American Numbering Plan |
| 293 | NAS | Network Access Server |
| 294 | NAT | Network Address Translation |
| 295 | NAUN | Nearest Active Upstream Neighbor |
| 296 | NBMA | Non-Broadcast, Multi-Access |
| 297 | NBP | Name Binding Protocol |
| 298 | NCP | Network Control Protocol |
| 299 | NCP | Netware Core Protocol |
| 300 | NET | Network Entity Title |
| 301 | NetBEUI | NetBIOS Extended User Interface |
| 302 | NetBIOS | Network Basic Input/output System |
| 303 | NIC | Network Information Center |
| 304 | NHC | Next Hop Client |
| 305 | NHRP | Next Hop Resolution Protocol |
| 306 | NHS | Next Hop Server |
| 307 | NIC | Network Interface Card |
| 308 | NLM | Netware Loadable Module |
| 309 | NLRI | Network Layer Reachability Information |
| 310 | NLSP | Netware Link-State Protocol |
| 311 | NNI | Network-to-Network Interface |
| 312 | NOS | Network Operating System |
| 313 | NRM | Normal Response Mode |
| 314 | NRT | Non-Real Time |
| 315 | NSAP | Network Service Access Point |
| 316 | NSO | National Standards Organization |
| 317 | NSP | Network Services Protocol |
| 318 | NSR | Non-Source Routed frame |
| 319 | NSSA | Not-So-Stubby Area |
| 320 | NT | Network Termination |
| 321 | NTN | National Terminal Number |
| 322 | OADM | Optical Add-Drop Multiplexer |
| 323 | OC | Optical Carrier |
| 324 | OCDM | Optical Code-Division Multiplexing |
| 325 | ODL | Optical Delay Line |
| 326 | ODSI | Optical Domain Services Interconnect |
| 327 | OEO | Optical-Electrical-Optical |
| 328 | OFDM | Orthogonal Frequency Division Multiplexing |
| 329 | OGP | Optical Gateway Protocol |
| 330 | OIF | Optical Interworking Forum |
| 331 | OLSR | Optical Label Switched Router |
| 332 | OLSR | Optimized Link-State Routing |
| 333 | OPS | Optical Packet Switching |
| 334 | OSI | Open Systems Interconnection |
| 335 | OSNR | Optical Signal-to-Noise Ratio |
| 336 | OSPF | Open Shortest Path First |
| 337 | OTN | Optical Transport Network |
| 338 | OXC | Optical cross-Connects |
| 339 | P | Provider core |
| 340 | PAD | Packet Assembler/Disassembler |
| 341 | PARC | Palo Alto Research Center |
| 342 | PCI | Protocol Control Information |
| 343 | PCM | Pulse-Code Modulation |
| 344 | PCR | Peak Cell Rate |
| 345 | PDB | Per-Domain Behavior |
| 346 | PDN | Public Data Network |
| 347 | PDU | Protocol Data Unit |
| 348 | PE | Provider Edge |
| 349 | PEP | Packet Exchange Protocol |
| 350 | PGL | Peer Group Leader |
| 351 | PGM | Pragmatic General Multicast |
| 352 | PHB | Per Hop Behavior |
| 353 | PIE | Protocol Information Element |
| 354 | PIM-DM | Protocol Independent Multicast Dense Mode |
| 355 | PIM-SM | Protocol Independent Multicast Sparse Mode |
| 356 | PING | Packet Internetwork Groper |
| 357 | PLCP | Physical Layer Convergence Procedure |
| 358 | PLP | Packet-Level Protocol |
| 359 | P-NNI | Private Network-to-Network Interface |
| 360 | POP | Point-Of-Presence |
| 361 | POS | Packet over Sonet |
| 362 | POS | Personal Operating Space |
| 363 | PPS | Point-to-Point Protocol |
| 364 | PPPoE | PPP over Ethernet |
| 365 | PPS | Packet Per Second |
| 366 | PPTP | Point-to-Point Tunneling Protocol |
| 367 | PRI | Primary Rate Interface |
| 368 | PSE | Packet Switching Exchange |
| 369 | PSNP | Partial Sequence Number Packet |
| 370 | PT | Payload Type |
| 371 | PTI | Packet Type Identifier |
| 372 | PTSE | PNNI Topology State Element |
| 373 | PTSP | PNNI Topology State Packet |
| 374 | PVC | Permanent Virtual Circuit |
| 375 | PVID | Port VLAN IDentifier |
| 376 | PVST | Per-VLAN Spanning Tree |
| 377 | QoS | Quality of Service |
| 378 | QOSF | QoS Forum |
| 379 | QPPB | QoS Policy Propagation via BGP |
| 380 | QTC | QuickTime Conferencing |
| 381 | RAID | Redundant Array of Independent Disks |
| 382 | RARP | Reverse Address Resolution Protocol |
| 383 | RD | Route Distinguisher |
| 384 | RD | Routing Domain |
| 385 | RDE | Route Determination Entity |
| 386 | RDI | Routing Domain Identifier |
| 387 | RED | Random Early Detect |
| 388 | RIB | Routing Information Base |
| 389 | RIF | Routing Information Field |
| 390 | RIO | RED with In-Out |
| 391 | RIP | Routing Information Protocol |
| 392 | RIPE NCC | Reseaux IP Europeens Network Coordination Center |
| 393 | RM | Requestor Module |
| 394 | RMON | Remote Monitoring |
| 395 | ROSE | Remote Operations Service Element |
| 396 | RPC | Remote Procedure Call |
| 397 | RPF | Reverse Path Forwarding |
| 398 | RPR | Resilient Packet Ring |
| 399 | RSP | Router Switch Processor |
| 400 | RSVP | Resource Reservation Protocol |
| 401 | RT | Real Time |
| 402 | RTCP | Real-time Transport Control Protocol |
| 403 | RTMP | Routing Table Maintenance Protocol |
| 404 | RTP | Real-time Transport Protocol |
| 405 | RTP | Routing Table Protocol |
| 406 | RTSE | Reliable Transfer Service Element |
| 407 | RTSP | Real Time Streaming Protocol |
| 408 | SAC | Single Attached Concentrator |
| 409 | SAID | Security Association IDentifier |
| 410 | SAN | Storage Area Networks |
| 411 | SAP | Service Access Point |
| 412 | SAP | Service Advertising Protocol |
| 413 | SAPI | Service Access Point Identifier |
| 414 | SAR | Segmentation and Reassembly |
| 415 | SAS | Single Attached Station |
| 416 | SCCP | Signaling Connection Control Part |
| 417 | SCM | Subcarrier Multiplexing |
| 418 | SCR | Sustainable Cell Rate |
| 419 | SCSI | Small Computer Systems Interface |
| 420 | SDH | Synchronous Digital Hierarchy |
| 421 | SDLC | Synchronous Data Link Control |
| 422 | SDRAM | Synchronous Dynamic Random Access Memory |
| 423 | SE | Shared-Explicit filter |
| 424 | SIP | SMDS Interface Protocol |
| 425 | SLA | Service Level Agreements |
| 426 | SLIP | Serial Line Internet Protocol |
| 427 | SMDS | Switched Multimegabit Data Service |
| 428 | SMI | Structure of Management Information |
| 429 | SMON | Switch Monitoring |
| 430 | SMRP | Simple Multicast Routing Protocol |
| 431 | SNAP | Sub Network Access Protocol |
| 432 | SNI | Subscriber-Network Interface |
| 433 | SNIA | Storage Networking Industry Association |
| 434 | SNMP | Simple Network Management Protocol |
| 435 | SNP | Sequence Number Protection |
| 436 | SNPA | Sub Network Point of Attachment |
| 437 | SONET | Synchronous Optical Network |
| 438 | SPF | Shortest Path First |
| 439 | SPP | Sequenced Packet Protocol |
| 440 | SPX | Sequenced Packet exchange |
| 441 | SRB | Source-Route Bridging |
| 442 | SRF | Specifically Routed Frame |
| 443 | SRT | Source Route Transparent |
| 444 | SS7 | Signaling System #7 |
| 445 | SSM | Source Specific Multicast |
| 446 | STA | Spanning Tree Algorithm |
| 447 | STE | Spanning Tree Explorer |
| 448 | STP | Shielded Twisted Pair |
| 449 | STP | Spanning Tree Protocol |
| 450 | STS | Synchronous Transport Signal |
| 451 | SVC | Switched Virtual Circuits |
| 452 | SVCC | Switched Virtual Circuit Connection |
| 453 | TA | Terminal Adapter |
| 454 | TAG | Technical Advisory Group |
| 455 | TAG | Tell-And-Go |
| 456 | TARP | Target Address Resolution Protocol |
| 457 | TAW | Tell-And-Wait |
| 458 | TAXI | Transmitter/Receiver Interface |
| 459 | TCAP | Transaction Capability |
| 460 | TCB | TCP Control Block |
| 461 | TCN | Topology Change Notification |
| 462 | TCP/IP | Transmission Control Protocol/Internet Protocol |
| 463 | TDM | Time Division Multiplexing |
| 464 | TDP | Tag Distribution Protocol |
| 465 | TE | Terminal Equipment |
| 466 | TE | Traffic Engineering |
| 467 | TEI | Terminal End-point Identifier |
| 468 | TFIB | Tag Forwarding Information Base |
| 469 | TIA | Telecommunications Industries Association |
| 470 | TIB | Tag Information Base |
| 471 | TLAP | Token talk Link Access Protocol |
| 472 | TLV | Type, Length, and Value |
| 473 | ToS | Type of Service |
| 474 | TP | Transport Protocol |
| 475 | TRBRF | Token Ring Bridge Relay Function |
| 476 | TRCRF | Token Ring Concentrator Relay Function |
| 477 | TTL | Time-to-Live |
| 478 | UBR | Unspecified Bit Rate |
| 479 | UDP | User Datagram Protocol |
| 480 | UDWDM | Ultra Dense Wavelength Division Multiplexing |
| 481 | UNI | USER TO NETWORK INTERFACE |
| 482 | UPC | Usage Parameter Control |
| 483 | UPSR | Unidirectional Path Switched Ring |
| 484 | UTP | Unshielded Twisted Pair |
| 485 | VAN | Value-Added Network |
| 486 | VARP | VINES Address Resolution Protocol |
| 487 | VBR | Variable Bit Rate |
| 488 | VC | Virtual Circuit |
| 489 | VCC | Virtual Channel Connection |
| 490 | VCI | Virtual Channel Identifier |
| 491 | VCIB | Virtual Circuit Information Base |
| 492 | VID | VLAN IDentifier |
| 493 | VINES | Virtual Integrated Network Service |
| 494 | VIP | VINES Internetwork Protocol |
| 495 | VLAN | Virtual LAN |
| 496 | VLSI | Very Large-Scale Integration |
| 497 | VLSM | Variable Length Subnet Mask |
| 498 | VNN | Virtual Network Navigator |
| 499 | VNS | Virtual Network Switching |
| 500 | VoIP | Voice over Internet Protocol |
| 501 | VoQ | Virtual Output Queuing |
| 502 | VPC | Virtual Path Connection |
| 503 | VPI | Virtual Path Identifier |
| 504 | VPN | Virtual Private Network |
| 505 | VRF | VPN Routing and Forwarding |
| 506 | VRRP | Virtual Router Redundancy Protocol |
| 507 | VTP | Virtual Terminal Protocol |
| 508 | VTP | Virtual Trunking Protocol |
| 509 | WAN | Wide Area Network |
| 510 | WDM | Wave Division Multiplexing |
| 511 | WECA | Wireless Ethernet Compatibility Alliance |
| 512 | WF | Wildcard Filter |
| 513 | WFQ | Weighted Fair Queuing |
| 514 | WG | Working Group |
| 515 | WLANA | Wireless LANs Association |
| 516 | WPAN | Wireless Personal Area Network |
| 517 | WRED | Wireless LANs Association |
| 518 | WRR | Weighted Round-Robin |
| 519 | XNS | Xerox Network Systems |
| 520 | ZBR | Zone Boundary Router |
| 521 | ZIP | Zone Information Protocol |
| 522 | ZIT | Zone Information Table |
