| AAA | Authentication, Authorization, and Accounting |
| AAAA | Authentication, Authorization, Accounting, and Auditing |
| ACL | Access Control List |
| ADSL | Asymmetric Digital Subscriber Line |
| AES | Advanced Encryption Standard |
| AH | Authentication Header |
| AP | Access Point |
| APC | Angle Polished Connector / Angled Physical Contact |
| APIPA | Automatic Private Internet Protocol Address |
| APT | Advanced Persistent Tool |
| ARIN | American Registry for Internet Numbers |
| ARP | Address Resolution Protocol |
| AS | Autonomous System |
| ASIC | Application Specific Integrated Circuit |
| ASP | Application Service Provider |
| ATM | Asynchronous Transfer Mode |
| AUP | Acceptable Use Policy |
| BCP | Business Continuity Plan |
| BERT | Bit-Error Rate Test |
| BGP | Border Gateway Protocol |
| BLE | Bluetooth Low Energy |
| BNC | British Naval Connector / Bayonet-Niell-Concelman |
| BootP | Boot Protocol/Bootstrap Protocol |
| BPDU | Bridge Protocol Data Unit |
| BRI | Basic Rate Interface |
| BSSID | Basic Service Set Identifier |
| BYOD | Bring Your Own Device |
| CaaS | Communication as a Service |
| CAM | Content Addressable Memory |
| CAN | Campus Area Network |
| CARP | Common Address Redundancy Protocol |
| CDMA | Code Division Multiple Access |
| CSMA/CA | Carrier Sense Multiple Access/Collision Avoidance |
| CSMA/CD | Carrier Sense Multiple Access/Collision Detection |
| CHAP | Challenge Handshake Authentication Protocol |
| CIA | Confidentiality, Integrity, and Availability |
| CIDR | Classless Inter-Domain Routing |
| CNAME | Canonical Name |
| CoS | Class of Service |
| CPU | Central Processing Unit |
| CRAM-MD5 | Challenge-Response Authentication Mechanism-Message Digest 5 |
| CRC | Cyclic Redundancy Checking |
| CSMA/CA | Carrier Sense Multiple Access/Collision Avoidance |
| CSU | Channel Service Unit |
| CVE | Common Vulnerabilities and Exposures |
| CVDM | Course Wave Division Multiplexing |
| DaaS | Desktop as a Service |
| D B | Decibel |
| DCS | Distributed Computer System |
| DDoS | Distributed Denial of Service |
| DHCP | Dynamic Host Configuration Protocol |
| DLC | Data Link Control |
| DLP | Data Loss Prevention or Data Leak Prevention |
| DLR | Device Level Ring |
| DMZ | Demilitarized Zone |
| DNAT | Destination Network Address Translation |
| DNS | Domain Name System/Domain Name Server/Domain Name Service |
| DOCSIS | Data-Over Cable Service Interface Specification |
| DoS | Denial of Service |
| DR | Designated Router |
| DSCP | Differentiated Services Code Point |
| DSL | Digital Subscriber Line |
| DSSS | Direct Sequence Spread Spectrum |
| DSU | Data Service Unit |
| DWDM | Dense Wavelength Division Multiplexing |
| E1 | E-Carrier Level 1 |
| EAP | Extensible Authentication Protocol |
| EDNS | Extension Mechanism for DNS |
| ECP | Exterior Gateway Protocol |
| EIA/TIA | Electronic Industries Association/Telecommunication Industries Association |
| EIRP | Effective Isotropic Radiated Power |
| EMI | Electromagnetic Interference |
| ESD | Electrostatic Discharge |
| ESP | Encapsulated Security Payload |
| ESSID | Extended Service Set Identifier |
| EUI | Extended Unique Identifier |
| FC | Fibre Channel |
| FCoE | Fiber Channel Over Ethernet |
| FCS | Frame Check Sequence |
| FDM | Frequency Division Multiplexing |
| FHRP | First Hop Redundancy Protocol |
| FHSS | Frequency Hopping Spread Spectrum |
| FM | Frequency Modulation |
| FQDN | Fully Qualified Domain Name |
| FTP | File Transfer Protocol |
| FTPS | File Transfer Protocol Security |
| GBIC | Gigabit Interface Converter |
| Gbps | Gigabits per second |
| GLBP | Gateway Load Balancing Protocol |
| GPG | GNU Privacy Guard |
| GRE | Generic Routing Encapsulation |
| GSM | Global System for Mobile Communications |
| HA | High Availability |
| HDLC | High-Level Data Link Control |
| HDMI | High-Definition Multimedia Interface |
| HIDS | Host Intrusion Detection System |
| HIPS | Host Intrusion Prevention System |
| HSPA | High-Speed Packet Access |
| HSRP | Hot Standby Router Protocol |
| HT | High throughput |
| HTTP | Hypertext Transfer Protocol |
| HTTPS | Hypertext Transfer Protocol Secure |
| HVAC | Heating, Ventilation, and Air Conditioning |
| Hz | Hertz |
| IaaS | Infrastructure as a Service |
| IANA | Internet Assigned Numbers Authority |
| ICA | Independent Computer Architecture |
| ICANN | Internet Corporation for Assigned Names and Numbers |
| ICMP | Internet Control Message Protocol |
| ICS | Internet Connection Sharing/Industrial Control System |
| IDF | Intermediate Distribution Frame |
| IDWS | Intrusion Detection System |
| IEEE | Institute of Electrical and Electronics Engineers |
| IGMP | Internet Group Message Protocol |
| IGP | Interior Gateway Protocol |
| IGRP | Interior Gateway Routing Protocol |
| IKE | Internet Key Exchange |
| IMAP | Internet Message Access Protocol |
| IMAP4 | Internet Message Access Protocol Version 4 |
| InterNIC | Internet Network Information Center |
| IoT | Internet of Things |
| IP | Internet Protocol |
| IPS | Intrusion Prevention System |
| IPSec | Internet Protocol Security |
| IPv4 | Internet Protocol Version 4 |
| IPv6 | Internet Protocol Version 6 |
| ISAKMP | Internet Security Association and Key Management Protocol |
| iSCSI | Internet Small Computer Systems Interface |
| ISDN | Integrated Services Digital Network |
| IS-IS | Intermediate System to Intermediate System |
| ISP | Internet Service Provider |
| IT | Information Technology |
| ITS | Intelligent Transportation System |
| IV | Initialization Vector |
| Kbps | Kilobits per second |
| KVM | Keyboard Video Mouse |
| L2TP | Layer 2 Tunneling Protocol |
| LACP | Link Aggregation Control Protocol |
| LAN | Local Area Network |
| LC | Local Connector |
| LDAP | Lightweight Directory Access Protocol |
| LDAPS | Lightweight Directory Access Protocol (secure) |
| LEC | Local Exchange Carrier |
| LED | Light Emitting Diode |
| LLC | Logical Link Control |
| LLDP | Link Layer Discovery Protocol |
| LSA | Link State Advertisements |
| LTE | Long Term Evolution |
| LWAPP | Light Weight Access Point Protocol |
| MaaS | Mobility as a Service |
| MAC | Media Access Control/Medium Access Control |
| MAN | Metropolitan Area Network |
| Mbps | Megabits per second |
| MBps | Megabytes per second |
| MDF | Main Distribution Frame |
| MDI | Media Dependent Interface |
| MDIX | Media Dependent Interface Crossover |
| MGCP | Media Gateway Control Protocol |
| mGRE | Multipoint Generic Routing Encapsulation |
| MIB | Management Information Base |
| MIMO | Multiple Input, Multiple Output |
| MU-MIMO | Multiuser – Multiple Input, Multiple Output |
| MLA | Master License Agreement/Multilateral Agreement |
| MMF | Multimode Fiber |
| MOA | Memorandum of Agreement |
| MOU | Memorandum of Understanding |
| MPLS | Multiprotocol Label Switching |
| MS-CHAP | Microsoft Challenge Handshake Authentication Protocol |
| MSA | Master Service Agreement |
| MSDS | Material Safety Data Sheet |
| MT-RJ | Mechanical Transfer Registered Jack |
| MTU | Maximum Transmission Unit |
| MTTR | Mean Time to Recovery |
| MTBF | Mean Time Between Failures |
| MT-RJ | Mechanical Transfer – Registered Jack |
| MTTR | Mean Time to REpair |
| MU-MIMO | Multiuser Multiple Input, Multiple Output |
| MX | Mail Exchanger |
| NAC | Network Access Control |
| NAS | Network Attached Storage |
| NAT | Network Address Translation |
| NCP | Network Control Protocol |
| NDA | Non-Disclosure Agreement |
| NDR | Non-Delivery Receipt |
| NetBEUI | Network Basic Input/Output Extended User Interface |
| NFC | Near Field Communication |
| NFS | Network File Service |
| NFV | Network Function Virtualization |
| NGFW | Next Generation Firewall |
| NIC | Network Interface Card |
| NIDS | Network Intrusion Detection System |
| NIPS | Network Intrusion Prevention System |
| NIU | Network Interface Unit |
| Nn | Nanometer |
| NNTP | Network News Transfer Protocol |
| NS | Name Server |
| NTP | Network Time Protocol |
| OCSP | Online Certificate Status Protocol |
| OCx | Optical Carrier |
| OID | Object Identifier |
| OS | Operating System |
| OSI | Open Systems Interconnect |
| OSPF | Open Shortest Path First |
| OTDR | Optical Time Domain Reflectometer |
| OUI | Organizationally Unique Identifier |
| PaaS | Platform as a Service |
| PAN | Personal Area Network |
| PAP | Password Authentication Protocol |
| PAT | Port Address Translation |
| PC | Personal Computer |
| PCM | Phase-Change Memory |
| PDoS | Permanent Denial of Service |
| PDU | Protocol Data Unit |
| PGP | Pretty Good Privacy |
| PKI | Public Key Infrastructure |
| PoE | Power over Ethernet |
| POP | Post Office Protocol |
| POP3 | Post Office Protocol version 3 |
| POTs | Plain Old Telephone Service |
| PPP | Point-to-Point Protocol |
| PPPoE | Point-to-Point Protocol over Ethernet |
| PPTP | Point-to-Point Tunneling Protocol |
| PKI | Primary Rate Interface |
| PSK | Pre-Shared Key |
| PSTN | Public Switched Telephone Network |
| PTP | Point-to-Point |
| PTR | Pointer |
| PUA | Privileged User Agreement |
| PVC | Permanent Virtual Circuit |
| QoS | Quality of Service |
| QSFP | Quad Small Form-Factor Pluggable |
| RA | Router Advertisements |
| RADIUS | Remote Authentication Dial-in-User Service |
| RAID | Redundant Array of Inexpensive (or Independent) Disks |
| RARP | Reverse Address Resolution Protocol |
| RAS | Remote Access Service |
| RDP | Remote Desktop Protocol |
| RF | Radio Frequency |
| RFC | Request for Comment |
| RFI | Radio Frequency Interface |
| RFP | Request for Proposal |
| RG | Radio Guide |
| RIP | Routing Internet Protocol |
| RJ | Registered Jack |
| RPO | Recovery Point Objective |
| RSA | Rivest, Shamir, Adelman |
| RSH | Remote Shell |
| RSTP | Rapid Spanning Tree Protocol |
| RTO | Recovery Time Objective |
| RTP | Real-Time Protocol |
| RTSP | Real-Time Streaming Protocol |
| RTT | Round Trip Time or Real Transfer Time |
| SA | Security Association |
| SaaS | Software as a Service |
| SAN | Storage Area Network |
| SC | Standard Connector/Subscriber Connector |
| SCADA | Supervisory Control and Data Acquisition |
| SCP | Secure Copy Protocol |
| SDLC | Software Development Life Cycle |
| SDN | Software Defined Network |
| SDP | Session Description Protocol |
| SDSL | Symmetrical Digital Subscriber Line |
| SDWAN | Software-Defined WAN |
| SFP | Small Form-Factor Pluggable |
| SFTP | Secure File Transfer Protocol |
| SGCP | Simple Gateway Control Protocol |
| SHA | Secure Hash Algorithm |
| SIEM | Security Information and Event Management |
| SIP | Session Initiation Protocol |
| SLA | Service-Level Agreement |
| SLAAC | Stateless Address-Auto Configuration |
| SLIP | Serial Line Internet Protocol |
| SMB | Service Message Block |
| SMF | Single-Mode Fiber |
| SMS | Short Message Service |
| SMTP | Simple Mail Transfer Protocol |
| SNAT | Static Network Address Translation/Source Network Address Translation |
| SNMP | Simple Network Management Protocol |
| SNTP | Simple Network Time Protocol |
| SOA | Start of Authority |
| SOHO | Small Office Home Office |
| SONET | Synchronous Optical Network |
| SOP | Standard Operating Protocol |
| SOW | Statement of Work |
| SPB | Shortest Path Bridging |
| SPI | Stateful Packet Inspection |
| SPS | Standby Power Supply |
| SQL | Structured Query Language |
| SRV | Service Record |
| SSH | Secure Shell |
| SSID | Service Set Identifier |
| SSL | Secure Sockets Layer |
| SSO | Single Sign-On |
| ST | Straight Tip or Snap Twist |
| STP | Spanning Tree Protocol/Shielded Twisted Pair |
| SVC | Switched Virtual Circuit |
| SYLOG | System Log |
| T1 | Terrestrial Carrier Level 1 |
| TA | Terminal Adapter |
| TACAS | Terminal Access Control Access Control System |
| TACAS+ | Terminal Access Control Access Control System+ |
| TCP | Transmission Control Protocol |
| TCP/IP | Transmission Control Protocol/Internet Protocol |
| TDM | Time Division Multiplexing |
| TDR | Time Domain Reflectometer |
| Telco | Telecommunications Company |
| TFTP | Trivial File Transfer Protocol |
| TIA/EIA | Telecommunications Industry Association/Electronic Industries Association |
| TKIP | Temporal Key Integrity Protocol |
| TLS | Transport Layer Security |
| TMS | Transportation Management System |
| TOS | Type of Service |
| TPM | Trusted Platform Module |
| TTL | Time to Live |
| TTLS | Tunneled Transport Layer Security |
| TX/RX | Transmit and Receive |
| UC | Unified Communications |
| UDP | User Datagram Protocol |
| UNC | Universal Naming Convention |
| UPC | Ultra Polished Connector |
| UPS | Uninterruptible Power Supply |
| URL | Uniform Resource Locator |
| USB | Universal Serial Bus |
| UTM | Unified Threat Management |
| VDSL | Variable Digital Subscriber Line |
| VIP | Virtual IP |
| VLAN | Virtual Local Area Network |
| VNC | Virtual Network Connection |
| vNIC | Virtual Network Interface Card |
| VoIP | Voice over IP |
| VPN | Virtual Private Network |
| VRF | Virtual Routing Forwarding |
| VRRP | Virtual Router Redundancy Protocol |
| VTC | Video Teleconference |
| VTP | VLAN Trunk Protocol |
| WAF | Web Application Firewall |
| WAN | Wide Area Network |
| WAP | Wireless Application Protocol/Wireless Access Point |
| WDM | Wavelength Division Multiplexing |
| WEP | Wired Equivalent Privacy |
| WLAN | Wireless Local Area Network |
| WMS | Warehouse Management System |
| WPA | Wi-Fi Protected Access |
| WPS | Wi-Fi Protected Setup |
| WWN | World Wide Name |
| XDSL | Extended Digital Subscriber Line |
| XML | eXtensible Markup Language |
| Zeroconf | Zero Configuration |
