2FA – 2 Factor Authentication

AAD – Azure Active Directory

ADSL – Asymmetrical Digital Subscriber Line

ALDO – Agile, Lean & DevOps

ALG – Application Layer Gateway

ATM – Asynchronous Transfer Mode

API – Application Programming Interface

APN – Access Point Name (telecoms)

AWS – Amazon Web Services

B2B – Business to Business

B2BUA – Back to Back User Agent (telecoms)

B2C – Business to Consumer

BDD – Behaviour Driven Development

BIND – Berkeley Internet Name Domain (Implementation of DNS)

BGP – Border Gateway Protocol

BSD – Berkeley Software Distribution

CA – Certificate Authority

CAMEL – Customised Applications for Mobile Networks Enhanced Logic (telecoms)

CCR – Call Completion Rate (telecoms)

CD – Continuous Delivery

CDIO – Conceive Design Implement Operate

CI – Continuos Integration

CLI – Caller Line Identification

CLEC – Competitive Local Exchange Carrier (telecoms)

CRM – Customer Relationship Manager

CMDB – Configuration Management Database

CMO – Chief Marketing Office

CMP – Change Management Process

CMS (1) – Content Management System

CMS (2) – Configuration Management System (ITIL)

CN – Common Name / Canonical Name

COBIT – Control Objectives for Information and Related Technologies

COTS – Common Off The Shelf

CPL – Call Processing Language (telecoms)

CRM – Customer Relationship Manager

CSI – CAMEL Subscriber Information (telecoms)

CTI – Computer Telephony Integration (telecoms)

CUBE – Cisco Unified Border Element (Cisco’s SBC, telecoms)

CVE – Common Vulnerability and Exposures

DDI (UK) – Direct Dial In

DID (US) – Direct Inward Dialling (US)

DHCP – Dynamic Host Configuration Protocol

DNS – Domain Name System

DREAD – Damage potential, Reproducibility, Exploitability, Affected users, Discoverability

DSL – Digital Subscriber Line

DTMF – Dual-Tone Multi-Frequency (telecoms)

DVCS – Distributed Version Control System (such as Git, Mercurial, Bazaar or Darcs)

EC2 – Elastic Compute Cloud (Amazon)

ERP – Enterprise Resource Planning

ETL – Extract, Transform & Load

EV – Extended Validation

FOSS – Free and Open Source Software

FTP – File Transfer Protocol

GDPR – General Data Protection Regulation

GNU – GNU’s Not Unix

GPL – General Public License (usually GNU GPL)

GRS – Geo Redundant Storage

IETF – Internet Engineering Task Force

HAN – Hosted Area Network

HSM – Hardware Security Module

HSRP – Hot Standby Router Protocol

HTTP – Hypertext Transfer Protocol

IaC – Infrastructure as Code

IaaS – Infrastructure as a Service

ILEC – Incumbent Local Exchange Carrier (telecoms)

IMAP – Internet Message Access Protocol (Email retrieval)

IOPS – Input / Output operations Per Second

IoT – Internet of Things

IP – Internet Protocol

IST – Incremetal State Transfer

ITIL – Information Technology Infrastructure Library (service management framework)

ITSM – Information Technology Service Management

ITSP – Internet Telephony Service Provider (telecoms)

KPI – Key Performance Indicator

KT – Knowledge Transfer

LAN – Local Area Network

LCR – Least Cost Routing

LMA – Logging, Monitoring & Alerting

LRS – Locally Redundant Storage

LTE – Long Term Evolution (mobile telecoms)

MDR – Managed Detection & Response Links (1, 2 & 3 there are so many others)

MNO – Mobile Network Operator

MOP – Method Of Procedure (Savvis/CenturyLink instructions for a managed change)

MNVO – Mobile Network Virtual Operator

MPL – Mozilla Public License

MSK – Amazon Managed Streaming for Apache Kafka

MSRN – Mobile Station Roaming Number (telecoms)

MTA – Mail Transport Agent (email)

MTR – My TraceRoute (formerly Matt’s TraceRoute), ping and traceroute functionality combined.

MTU – Maximum Transmission Unit

NAPTR – Name Authority PoinTeR (telecoms)

NAS – Network-Attached Storage

NAT – Network Address Translation

NFR – Non-Functional Requirement

NFS – Network File System

OAS – Online Application System

OOAD – Object Orientated Analysis & Design

OSS – Open Source Software

ONT – Optical Network Terminal

OTG – On The Go

PaaS – Platform as a Service

PBX – Private Branch Exchange (telecoms)

PCAP – Packet Capture

PHP – PHP Hypertext Preprocessor (previously known as Personal Home Page)

PKI – Public Key Infrastructure

POP – Post Office Protocol (email)

PRINCE – Projects In Controlled Environments

PSTN – Public Switched Telephone Network

QoS – Quality of Service

QWAC – Qualified Website Authentication Certificate

RBAC – Role Based Access Control

RDS – Relational Database Service (Amazon Service)

RFC – Request For Comments

RHEL – RedHat Enterprise Linux

RPM – Redhat Package Manager

RTP – Real-time Transport Protocol (telecoms)

RTSP – Real-time Streaming Protocol (telecoms)

RSVP – Resource Reservation Protocol (telecoms)

S3 – Simple Storage Service (Amazon)

SaaS – Software as a Service

SAN – Storage Area Network

SAP – Session Announcement Protocol (telecoms)

SAS – Serially Attached SCSI

SATA – Serial AT Attached storage

SBC – Session Border Controller (telecoms)

SCM – Source Control Management (otherwise known as Version Control, or Revision Control)

SDP – Session Description Protocol (telecoms)

SDSL –Symmetrical Digital Subscriber Line

SFP – Small Form-factor Pluggable (a small pluggable module with an optical transceiver or copper port on an enterprise switch)

SIP (1) – Session Initiation Protocol (telecoms)

SIP (2) – Service Improvement Plan (ITIL)

SIP ALG – Session Initiation Protocol Application Layer Gateway

SMTP – Simple Mail Transfer Protocol

SNAT – Source Network Address Translation

SNI – Server Name Indication

SNMP – Simple Network Message Protocol

SOA – Service Orientated Architecture

SRV – SeRVice Record (telecoms), Cross between a CNAME and MX record, contains a CNAME port number and weight.

SSD – Solid State Drive

SSL – Secure Socket Layer

SST – State Snapshot Transfer (Percona/MySQL)

STUN – Session Traversal Utilities for NAT

TCP – Transmission Control Protocol

TDD – Test Driven Development

TLS – Transport Layer Security

TOGAF – The Open Group Architecture Framework

ToS – Terms of Service

TTFB – Time To First Byte

TTS – Text To Speech (telecoms)

UA – User Agent (SIPS)

UAC – User Agent Client (SIPS)

UAS – User Agent Server (SIPS)

URL – Universal Resource Locator

USB – Universal Serial Bus

VCS – Version Control System (also known as Revision Control, Source Control)

VoIP – Voice over Internet Protocol

VLSM – Variable Length Subnet Masks

VRRP – Virtual Router Redundancy Protocol

WAN – Wide Area Network