These are common computer networking acronyms that you must know and you will encounter if you are in Information Technology (IT) or Telecommunication (Telco) industry especially if your are working as network and systems engineer.
| Acronyms | Meaning |
| ACL | Access Control List |
| AD | Advertised Distance |
| AS | Autonomous System |
| ASA | Adaptive Security Appliance |
| ARP | Address Resolution Protocol |
| BER | Bit Error Rate |
| BGP | Border Gateway Protocol |
| CDN | Content Delivery Network |
| CIDR | Classless Inter-Domain Routing |
| CIR | Committed Information Rate |
| CLI | Command Line Interpreter |
| CMTS | Cable Modem Termination System |
| CPE | Customer Premises Equipment |
| CPU | Central Processing Unit |
| CRC | Cyclic Redundancy Check |
| DHCP | Dynamic Host Configuration Protocol |
| DNS | Domain Name System |
| DOCSIS | Data Over Cable Service Interface Specification |
| DOS | Denial of Service |
| DSCP | Differentiated Services Code Point |
| DSLAM | DSL Access Multiplexer |
| DSL | Digital Subscriber Line |
| DWDM | Digital Wavelength Dense Multiplexing |
| EIGRP | Enhanced Interior Gateway Routing Protocol |
| FIB | Forward Information Base |
| FTP | File Transfer Protocol |
| FTTH | Fiber to the Home |
| GE | Gigabit Ethernet |
| GLBP | Gateway Load Balancing Protocol |
| GPRS | General Packet Radio Service |
| GRE | Generic Routing Encapsulation |
| GSM | Global System for Mobile |
| HDLC | High Level Data Link Control |
| HTTP | Hyper Text Transfer Protocol |
| IaaS | Infrastructure as aa Service |
| IANA | Internet Assigned Number Authority |
| ICMP | Internet Control Message Protocol |
| IDS | Intrusion Detection System |
| IEEE | Institute for Electrical and Electronic Engineers |
| IETF | Internet Engineering Task Force |
| IGMP | Internet Group Management Protocol |
| IGP | Interior Gateway Protocol |
| IGRP | Interior Gateway Routing Protocol |
| IKE | Internet Key Exchange |
| IPSEC | Internet Protocol Security |
| IPTV | Internet Protocol Television |
| IP | Internet Protocol |
| IPS | Intrusion Prevention System |
| IS-IS | Intermediate System to Intermediate System |
| ISP | Internet Service Provider |
| ISSU | In-Service Software Upgrade |
| IT | Information Technology |
| IX | Internet Exchange |
| L2TP | Layer 2 Tunnel Protocol |
| LACP | Link Aggregation Control Protocol |
| LAG | Link Aggregation |
| LAN | Local Area Network |
| LDP | Label Distribution Protocol |
| MAC | Media Access Control |
| MD5 | Message Digest 5 |
| MDF | Main Distribution Frame |
| MIB | Management Information Base |
| MLP | Multilink Point-to-Point Protocol |
| MPLS | Multi Protocol Label Switching |
| MTU | Maximum Transmission Unit |
| NAS | Network-Attached Storage |
| NAT | Network Address Translation |
| NBMA | Non-Broadcast Multiple Access |
| NFV | Network Function Virtualization |
| NMS | Network Monitoring System |
| NIC | Network Interface Card |
| NTP | network Time Protocol |
| OID | Object Identifier |
| OLT | Optical Line Terminator |
| ONT | Optical Network Terminator |
| OS | Operating System |
| OSI | Open System Interconnect |
| OSPF | Open Shortest Path First |
| OTN | Optical Tranport Network |
| PAT | Port Address Translation |
| PBR | Policy-Based Routing |
| PBX | Private Branch Exchange |
| PDU | Protocol Data Unit |
| PE | Provider Edge |
| PIM | Protocol Independent Multicast |
| POP | Point of Presence |
| PPP | Point-to-Point Protocol |
| PPTP | Point-to-Point Tunneling Protocol |
| PSTN | Public Switched Telephone Network |
| PVC | Permanent Virtual Connection |
| PVST | Per-VLAN Spanning Tree |
| QOE | Quality of Experience |
| QOS | Quality of Service |
| RADIUS | Remote Authentication Dial-in User Service |
| RAM | Random Access Memory |
| RFC | Request for Comments |
| RIP | Routing Information Protocol |
| ROM | Read-Only Memory |
| RP | Rendezvous Point |
| RPF | Reverse Path Forwarding |
| RSTP | Rapid Spanning Tree Protocol |
| RSVP | Resource Reservation Protocol |
| RTP | Real-time Transport Protocol |
| SaaS | Software as a Service |
| SASE | Secure Access Service Edge |
| SDN | Software Defined Networking |
| SD-WAN | Software Defined Wide Area Network |
| SFP | Small Form-factor Pluggable |
| SMTP | Simple Mail Transfer Protocol |
| SNMP | Simple Network Management Protocol |
| SS7 | Signaling System 7 |
| SSH | Secure Shell |
| SSID | Service Set Identifier |
| SSO | Stateful Switch Over |
| STP | Spanning Tree Protocol |
| TCP/IP | Transmission Control Protocol / Internet Protocol |
| TFTP | Trivial File Transfer Protocol |
| TOS | Type of Service |
| TTL | Time to Live |
| UDP | User Datagram Protocol |
| URL | Uniform Resource Locator |
| URPF | Unicast Reverse Path Forwading |
| USB | Universal Serial Bus |
| VC | Virtual Circuit |
| VLAN | Virtual Local Area Network |
| VLSM | Variable Length Subnet Masking |
| VM | Virtual Machine |
| VNF | Virtual Network Functions |
| VOD | Video on Demand |
| VOIP | Voice Over IP |
| VPN | Virtual Private Network |
| VRRP | Virtual Router Redundancy Protocol |
| VTP | VLAN Trunking Protocol |
| WAN | Wide Area Network |
| WWW | World Wide Web |
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