# CIW Certification/Acronyms

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This is a glossary of acronyms commonly used when studying for any of the ProSoft CIW Certification Exams
To add new definitions, please use the format:

## A
### AADS

    Ameritech Advanced Data Systems
Ameritech (NYSE: AIT) serves millions of customers in 50 states and 40 countries. Ameritech provides a full range of communications services including local and long-distance telephone and data, cellular, paging, security, cable TV, Internet and more. One of the world's 100 largest companies, Ameritech (www.ameritech.com) has 70,500 employees, 1 million shareowners and more than $30 billion in assets. Ameritech also operates the Internet Network Access Point (NAP) in Chicago, the largest Asynchronous Transfer Mode (ATM) access point in the world. Ameritech has also been selected by the National Science Foundation as the global NAP for the next generation Internet initiative. iCAIR Press Release February 1999

### ACH

    Automated Clearing House
Automated Clearing House (ACH) is the name of an electronic network for financial transactions in the United States. ACH processes large volumes of both credit and debit transactions which are originated in batches.- More From Wikipedia -

### ACL

    Access Control List
In computer security, an access control list (ACL) is a list of permissions attached to an object. The list specifies who or what is allowed to access the object and what operations are allowed to be performed on the object. - More From Wikipedia -

### AD

    Active Directory
Active Directory (AD) is an implementation of LDAP directory services by Microsoft for use primarily in Windows environments. The main purpose of Active Directory is to provide central authentication and authorization services for Windows based computers. - More From Wikipedia -

### ADO

    ActiveX Data Object
Microsoft ActiveX Data Objects (ADO) is a set of Component Object Model objects for accessing data sources. It provides a layer between programming languages and OLE DB (a means of accessing data stores in a uniform manner), which allows a developer to write programs which access data, without knowing how the database is implemented. - More From Wikipedia -

### ADOdb

    ActiveX Data Object Database
ADOdb is a database abstraction library for PHP and Python based on the same concept as Microsoft's ActiveX Data Objects. It allows developers to write applications in a fairly consistent way regardless of the underlying database storing the information. The advantage is that the database can be changed without re-writing every call to it in the application. - More From Wikipedia -

### ADR

    Advanced Data Recording

### ADSL

    Asymmetric Digital Subscriber Line
Asymmetric Digital Subscriber Line (ADSL) is a form of DSL, a data communications technology that enables faster data transmission over copper telephone lines than a conventional voiceband modem can provide. - More From Wikipedia -

### AFP

    Apple File Protocol
The Apple Filing Protocol (AFP) is a layer 6 (presentation layer) network protocol that offers file services for Mac OS X and Classic Mac OS. - More From Wikipedia -

### AH

    Authentication Header
AH is a protocol that provides authentication of either all or part of the contents of a datagram through the addition of a header that is calculated based on the values in the datagram. - More From TCP/IP Guide -

### AM

    Amplitude Modulation
Amplitude modulation (AM) is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. - More From Wikipedia -

### AMI

    Alternate Mark Inversion
When used on a T-carrier, bipolar encoding is known as Alternate Mark Inversion because, in this context, a binary 1 is referred to as a "mark", while a binary 0 is called a "space".[2] The coding was used extensively in first-generation PCM networks, and is still commonly seen on older multiplexing equipment today. - More From Wikipedia -

### ANS

    Advanced Network Services

### ANSI

    American National Standards Institute
The American National Standards Institute or ANSI (IPA pronunciation: [ænsiː]) is a private nonprofit organization that oversees the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States. - More From Wikipedia -

### AP

    Access Point
In computer networking, a wireless access point (WAP or AP) is a device that connects wireless communication devices together to form a wireless network. - More From Wikipedia -

### API

    Application Program Interface
An application programming interface (API) is a source code interface that a computer application, operating system or library provides to support requests for services to be made of it by a computer program. - More From Wikipedia -

### APIPA

    Automatic Private IP Addressing
Zeroconf or Zero Configuration Networking is a set of techniques that automatically create a usable IP network without configuration or special servers. (Redirected from APIPA) - More From Wikipedia -

### ARP

    Address Resolution Protocol
In computer networking, the Address Resolution Protocol (ARP) is the standard method for finding a host's hardware address when only its network layer address is known. - More From Wikipedia -

### ARPA

    Advanced Research Projects Agency
The Defense Advanced Research Projects Agency (DARPA) is an agency of the United States Department of Defense responsible for the development of new technology for use by the military. (Redirected from Advanced Research Projects Agency) - More From Wikipedia -

### ARPANET

    Advanced Research Projects Agency Network
The Advanced Research Projects Agency Network (ARPANET) developed by DARPA of the United States Department of Defense was the world's first operational packet switching network, and the predecessor of the global Internet. - More From Wikipedia -

### ASCII

    American Standard Code for Information Interchange
American Standard Code for Information Interchange (ASCII) is a character encoding based on the English alphabet. ASCII codes represent text in computers, communications equipment, and other devices that work with text. - More From Wikipedia -

### ASF

    Advanced Streaming Format
Advanced Systems Format (formerly Advanced Streaming Format) is Microsoft's proprietary digital audio/digital video container format, especially meant for streaming media. - More From Wikipedia -

### ASP

    Active Server Pages / Application Service Provider
Active Server Pages (ASP) is Microsoft's server-side script engine for dynamically-generated web pages. It is marketed as an add-on to Internet Information Services (IIS). - More From Wikipedia - An application service provider (ASP) is a business that provides computer-based services to customers over a network. - More From Wikipedia -

### ATM

    Asynchronous Transfer Mode
Asynchronous Transfer Mode (ATM) is a cell relay, packet switching network and data link layer protocol which encodes data traffic into small (53 bytes; 48 bytes of data and 5 bytes of header information) fixed-sized cells. ATM provides data link layer services that run over Layer 1 links. [Asynchronous Transfer Mode (ATM) is a cell relay, packet switching network and data link layer protocol which encodes data traffic into small (53 bytes; 48 bytes of data and 5 bytes of header information) fixed-sized cells. ATM provides data link layer services that run over Layer 1 links. - More From Wikipedia -

### ATVEF

    Advanced Television Enhancement Forum

### AU

    Unix Audio

### AV

    Anti-Virus
Antivirus software consists of computer programs that attempt to identify, thwart and eliminate computer viruses and other malicious software (malware). - More From Wikipedia -

### AVI

    Audio Visual Interleaved
Audio Video Interleave, known by its acronym AVI, is a multimedia container format introduced by Microsoft in November 1992 as part of its Video for Windows technology. AVI files can contain both audio and video data in a standard container that allows synchronous audio-with-video playback. - More From Wikipedia -
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## B
### B2B

    Business to Business
Business-to-business or B2B is a term commonly used to describe the transaction of goods or services between businesses. - More from Wikipedia -

### B2E

    Business to Employee
Business-to-employee (B2E) electronic commerce uses an intrabusiness network which allows companies to provide products and/or services to their employees. - More from Wikipedia -

### B2G

    Business to Government
Business-to-government e-commerce (B2G) networks allow businesses to bid on government RFPs in a reverse auction fashion. Public sector organizations (PSO's) post tenders in the form of RFP's, RFI's, RFQ's etc. and suppliers respond to them. - More from Wikipedia -

### BASH

    Bourne Again Shell
Bash is a Unix shell written for the GNU Project. The name of the actual executable is bash. Its name is an acronym for Bourne-again shell. - More from Wikipedia -

### BDC

    Backup Domain Controller
In Windows NT 4 server domains, the Backup Domain Controller (BDC) is a computer that has a copy of the user accounts database. - More from Wikipedia -

### BERT

    Bit-Error Rate Test

### BGP

    Border Gateway Protocol
The Border Gateway Protocol (BGP) is the core routing protocol of the Internet. It works by maintaining a table of IP networks or 'prefixes' which designate network reachability among autonomous systems (AS). - More from Wikipedia -

### BIND

    Berkeley Internet Name Domain
BIND (Berkeley Internet Name Domain) is the most commonly used DNS server on the Internet, especially on Unix-like systems, where it is a de facto standard. - More from Wikipedia -

### BLOB

    Binary Large Object
A binary large object, also known as a blob, is a collection of binary data stored as a single entity in a database management system. - More from Wikipedia -

### BMP

    Bitmapped
The BMP file format, sometimes called bitmap or DIB file format (for device-independent bitmap), is an image file format used to store bitmap digital images, especially on Microsoft Windows and OS/2 operating systems. - More from Wikipedia -

### BNC

    Bayonet Nut Connector / Bayonet Neill Concelman / British Naval Connector
The BNC connector is used for RF signal (typically pro-video) connections, both for analog and Serial Digital Interface video signals. - More from Wikipedia -

### BPS

    Bits per second
In telecommunications and computing, bitrate is the number of bits that are conveyed or processed per unit of time. - More from Wikipedia -

### BRI

    Basic Rate Interface
Basic rate interface (BRI, 2B+D, 2B1D) is an Integrated Services Digital Network (ISDN) configuration defined in the physical layer standard I.430 produced by the ITU. - More from Wikipedia -

### BSD

    Berkeley Software Distribution
Berkeley Software Distribution (BSD, sometimes called Berkeley Unix) is the UNIX derivative distributed by the University of California, Berkeley, starting in the 1970s. - More from Wikipedia -
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## C
### C2B

    Consumer to Business
Consumer-to-business (C2B ) is an electronic commerce business model in which consumers (individuals) offer products and services to companies and the companies pay them. This business model is a complete reversal of traditional business model where companies offer goods and services to consumers (business-to-consumer = B2C). - More from Wikipedia -

### C2C

    Consumer to Consumer
Consumer-to-consumer (or C2C) electronic commerce involves the electronically-facilitated transactions between consumers through some third party. A common example is the online auction, in which a consumer posts an item for sale and other consumers bid to purchase it; the third party generally charges a flat fee or commission. - More from Wikipedia -

### CA

    Certification Authority
In cryptography, a certificate authority or certification authority (CA) is an entity which issues digital certificates for use by other parties. It is an example of a trusted third party. CAs are characteristic of many public key infrastructure (PKI) schemes. There are many commercial CAs that charge for their services. Institutions and governments may have their own CAs, and there are also free CAs. - More from Wikipedia -

### CAN

    Campus Area Network
A campus area network (CAN) is a computer network made up of an interconnection of local area networks (LANs) within a limited geographical area. It can be considered one form of a metropolitan area network, specific to an academic setting. - More from Wikipedia -

### CAU

    Controlled Access Unit

### CDF

    Channel Definition Format
Channel Definition Format (CDF) is an XML standard used in conjunction with Microsoft Active Channel and Smart Offline Favorites technologies. Its use is to define a website's content and structure. - More from Wikipedia -

### CGI

    Common Gateway Interface
The Common Gateway Interface (CGI) is a standard protocol for interfacing external application software with an information server, commonly a web server. This allows the server to pass requests from a client web browser to the external application. The web server can then return the output from the application to the web browser. - More from Wikipedia -

### CHAP

    Challenge Handshake Authentication Protocol
CHAP is an authentication scheme used by Point to Point Protocol (PPP) servers to validate the identity of remote clients. - More from Wikipedia -

### CIDR

    Classless Inter-Domain Routing
Classless Inter-Domain Routing (CIDR, pronounced "cider") was introduced in 1993 and is the latest refinement to the way IP addresses are interpreted. - More from Wikipedia -

### CIR

    Committed Information Rate
Committed Information Rate or CIR in a Frame relay network is the average bandwidth for a virtual circuit guaranteed by an ISP to work under normal conditions. At any given time the bandwidth should not fall below this committed figure. It is usually expressed in kilobits per second (kbit/s). - More from Wikipedia -

### CNAME

    Canonical Name

### CO

    Central Office

### CODEC

    Compressor/Decompressor / Coder/Decoder
A codec is a device or program capable of performing encoding and decoding on a digital data stream or signal. The word codec may be a combination of any of the following: 'Compressor-Decompressor', 'Coder-Decoder', or 'Compression/Decompression algorithm'. - More from Wikipedia -

### COM

    Common Object Model
Component Object Model (COM) is a platform for software componentry introduced by Microsoft in 1993. It is used to enable interprocess communication and dynamic object creation in any programming language that supports the technology. - More from Wikipedia -

### CORBA

    Common Object Request Broker Architecture
The Common Object Request Broker Architecture (CORBA) is a standard defined by the Object Management Group (OMG) that enables software components written in multiple computer languages and running on multiple computers to work together. - More from Wikipedia -

### CPAN

    Comprehensive Perl Archive Network
CPAN is an acronym standing for Comprehensive Perl Archive Network, an archive of over 12,200 modules of software written in Perl, as well as documentation for it. - More from Wikipedia -

### CPU

    Central Processing Unit
A central processing unit (CPU), or sometimes simply processor, is the component in a digital computer capable of executing a program. - More from Wikipedia -

### CRC

    Cyclical Redundancy Check
A cyclic redundancy check (CRC) is a type of function that takes as input a data stream of any length and produces as output a value of a certain fixed size. The term CRC is often used to denote either the function or the function's output. - More from Wikipedia -

### CSMA/CA

    Carrier Sense Multiple Access / Collision Avoidance
In computer networking, CSMA/CA belongs to a class of protocols called multiple access methods. CSMA/CA stands for: Carrier Sense Multiple Access With Collision Avoidance. In CSMA, a station wishing to transmit has to first listen to the channel for a predetermined amount of time so as to check for any activity on the channel. If the channel is sensed "idle" then the station is permitted to transmit. If the channel is sensed as "busy" the station has to defer its transmission. - More from Wikipedia -

### CSMA/CD

    Carrier Sense Multiple Access / Collision Detection
Carrier Sense Multiple Access With Collision Detection (CSMA/CD) is a network control protocol in which a carrier sensing scheme is used. A transmitting data station that detects another signal while transmitting a frame, stops transmitting that frame, transmits a jam signal, and then waits for a random time interval before trying to send that frame again. - More from Wikipedia -

### CSNW

    Client Services for NetWare

### CSS

    Cascading Style Sheet
Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in a markup language. Its most common application is to style web pages written in HTML and XHTML. - More from Wikipedia -

### CSU

    Channel Service Unit
In telecommunications, a channel service unit (CSU) is a line bridging device for use with T-carrier. - More from Wikipedia -

### CSU/DSU

    Channel Service Unit/Data Service Unit
A CSU/DSU (Channel Service Unit/Data Service Unit) is a digital-interface device used to connect a router to a digital circuit such as a T1 or T3 line. A CSU/DSU operates at the physical layer (layer 1) of the OSI model. - More from Wikipedia -
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## D
### DARPA

    Defense Advanced Research Projects Agency

### DBMS

    Database Management Systems

### DC

    Domain Controller

### DCE

    Data Communication Equipment

### DCOM

    Distributed Component Object Model

### DDS

    Dataphone Digital Service / Digital Data Storage / Digital Data Service

### DES

    Data Encryption Service

### DHCP

    Dynamic Host Configuration Protocol

### DHTML

    Dynamic HTML

### DLC

    Data Link Control

### DLL

    Data Link Library / Dynamic Linked Library

### DMZ

    Demilitarized Zone

### DNS

    Domain Name Service / Domain Name Server / Domain Name System

### DOD

    Department of Defense

### DOS

    Denial of Service

### DPN

    Dedicated Private Network

### DSL

    Digital Subscriber Line

### DSU

    Data Service Unit / Digital Service Unit

### DSSS

    Direct Sequence Spread Spectrum

### DTD

    Document Type Definition

### DTE

    Data Terminal Equipment

### DUN

    Dial-Up Network

### DVD

    Digital Versatile Disk / Digital Video Disk

### DVMRP

    Distance Vector Multicast Routing Protocol
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## E
### EAP

    Extensible Authentication Protocol

### EBT

    Electronic Benefits Transfer

### ECMAScript

    European Computer Manufacturers Association Scripting

### EDI

    Electronic Data Interchange

### EFS

    Encrypting File System

### EGP

    Exterior Gateway Protocol

### EMI

    ElectroMagnetic Interference

### EPS

    Encapsulated PostScript

### ERP

    Enterprise Resource Planning

### ESD

    Electrostatic Discharge

### EULA

    End-User License Agreement
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## F
### FAT

    File Allocation Table

### FDDI

    Fiber Distributed Data Interface

### FDM

    Frequency Division Multiplexing

### FHSS

    Frequency Hopping Spread Spectrum

### FM

    Frequency Modulation

### FQDN

    Fully Qualified Domain Name

### FTP

    File Transfer Protocol

### FTPd

    File Transfer Protocol Daemon
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## G
### G2B

    Government to Business

### G2C

    Government to Consumer

### GBIC

    Gigabit Interface Converter

### GIF

    Graphics Interchange Format

### GPO

    Group Policy Object

### GUI

    Graphical User Interface

### GSNW

    Gateway Services for NetWare
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## H
### HDLC

    High-Level Data Link Control

### HDML

    Handheld Device Markup Language

### HDSL

    High Data Rate Digital Subscriber Line

### HP

    Hewlett-Packard

### HTML

    Hypertext Markup Language

### HTTP

    Hypertext Transfer Protocol

### HTTPd

    Hypertext Transfer Protocol Daemon

### HTTPS

    Hypertext Transfer Protocol Secure
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## I
### IAB

    Internet Architecture Board

### IANA

    Internet Assigned Numbers Authority

### IBM

    International Business Machines

### ICA

    Independent Computer Architecture

### ICANN

    Internet Corporation for Assigned Names and Numbers

### ICMP

    Internet Control Message Protocol

### ICS

    Internet Connection Sharing

### IE

    Internet Explorer

### IEEE

    Institute of Electrical and Electronics Engineers

### IETF

    Internet Engineering Task Force

### IGMP

    Internet Group Multicast Protocol

### IHL

    Internet Header Length

### IIS

    Internet Information Server

### IKE

    Internet Key Exchange

### IMAP

    Internet Message Access Protocol

### IMAP4

    Internet Message Access Protocol version 4

### INI (file)

    Initialization File

### INND

    Internet News Daemon

### IOTP

    Internet Open Trading Protocol

### IP

    Internet Protocol

### IPP

    Internet Printing Protocol

### IPSec

    Internet Protocol Security

### IPv4

    Internet Protocol version 4

### IPv6

    Internet Protocol version 6

### IPX

    Internetwork Packet Exchange

### IPX/SPX

    Internetwork Packet Exchange / Sequence Packet Exchange

### IRC

    Internet Relay Chat

### IRQ

    Interrupt Request

### IRTF

    Internet Research Task Force

### ISA

    Industry Standard Architecture

### ISAPI

    Internet Server Application Programming Interface

### ISDN

    Integrated Services Digital Network

### ISM

    Industrial, Scientific, and Medical

### ISO

    International Organization for Standardization

### ISP

    Internet Service Provider

### IT

    Information Technology

### ITSP

    Internet Telephony Service Provider

### ITU

    International Telecommunications Union
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## J
### JDBC

    Java Database Connectivity

### JPEG

    Joint Photographics Experts Group

### JSAPI

    Java Speech API

### JSML

    Java Speech Markup Language

### JSP

    Java Server Pages

### JVM

    Java Virtual Machine
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## K
### Kbps

    Kilobits per second
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## L
### L2F

    Layer 2 Forwarding

### L2TP

    Layer 2 Tunneling Protocol

### LAN

    Local Area Network

### LC

    Local Connector

### LCP

    Link Control Protocol

### LDAP

    Lightweight Directory Access Protocol

### LLC

    Logical Link Control

### LPD

    Line Printer Daemon

### LPQ

    Line Printer Queue

### LPR

    Line Printer Remote
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## M
### MAC

    Media Access Control / Medium Access Control

### MAPI

    Message Application Programming Interface

### MAU

    Multistation Access Unit

### MD5

    Message Digest 5

### MDI

    Media Dependent Interface

### MDIX

    Media Dependent Interface Crossover

### MIB

    Management Information Base

### MIDI

    Musical Instrument Digital Interface

### MIME

    Multipurpose Internet Mail Extension

### MMF

    MultiMode Fiber

### MPEG

    Moving Picture Experts Group

### MSAU

    MultiStation Access Unit

### MX

    Mail Exchange
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## N
### NADN

    Nearest Active Downstream Neighbor

### NAP

    Network Access Point

### NAT

    Network Address Translation

### NAUN

    Nearest Active Upstream Neighbor

### NCP

    NetWare Core Protocol

### NCSA

    National Center for Supercomputing Applications

### NES

    Netscape Enterprise Server

### NDS

    Novell Directory Services / NetWare Directory Services

### NetBEUI

    NetBIOS Enhanced User Interface

### NetBIOS

    Network Basic Input Output System

### NFS

    Network File System

### NIC

    Network Interface Card

### NIS

    Network Information Service

### NLM

    NetWare Loadable Modulue

### NLSP

    NetWare Link Services Protocol

### NNTP

    Network News Transfer Protocol

### NOS

    Network Operating System

### NT

    New Technology

### NT1

    Network Terminator 1

### NTFS

    New Technology File System

### NTP

    Network Time Protocol
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## O
### OBI

    Open Buying on the Internet

### ODBC

    Open Database Connectivity

### OEM

    Original Equipment Manufacturer

### OLAP

    Online Analytical Processing

### OLTP

    Online Transition Processing

### OODB

    Object-Oriented Database

### ORB

    Object Request Broker

### OS

    Operating Systems

### OSI

    Open Systems Interconnect

### OSPF

    Open Shortest Path First

### OTDR

    Optical Time Domain Reflectometer

### OTP

    Open Trading Protocol

### OU

    Organizational Unit

### OUI

    Organizationally Unique Identifier
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## P
### PAD

    Packet Assembler/Disassembler

### PAP

    Password Authentication Protocol

### PBX

    Private Branch Exchange

### PC

    Personal Computer

### PCI

    Peripheral Component Interconnect

### PCMC

    IA Personal Computer Memory Card International Association

### PERL

    Practical Extraction and Report Language

### PDC

    Primary Domain Controller

### PDF

    Portable Document Format

### PDL

    Page Description Language

### PGP

    Pretty Good Privacy

### PHP

    Hypertext Processing

### PICS

    Platform for Internet Content Selection

### PKI

    Public Key Infrastructure

### PNG

    Portable Network Graphics

### POP

    Post Office Protocol / Point of Presence

### POP3

    Post Office Protocol version 3

### POTS

    Plain Old Telephone Service

### ppi

    Pixels Per Inch

### PPP

    Point-to-Point Protocol

### PPPoE

    Point-to-Point Protocol over Ethernet

### PPTP

    Point-to-Point Tunneling Protocol

### PRI

    Primary Rate Interface

### PSTN

    Public Switched Telephone Network

### PVC

    Permanent Virtual Circuit
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## Q
### QoS

    Quality of Service

### QTVR

    QuickTime Virtual Reality
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## R
### RADIUS

    Remote Authentication Dial-In User Service

### RAID

    Redundant Array of Independent Disks / Redundant Array of Inexpensive Disks

### RAM

    Random Access Memory

### RARP

    Reverse Address Resolution Protocol

### RAS

    Remote Access Service

### RDBMS

    Relational Database Management System

### RDP

    Remote Desktop Protocol

### RFC

    Request for Comment

### RFI

    Radio Frequency Interface

### RG

    Radio Grade

### RIP

    Routing Information Protocol

### RISC

    Reduced Instruction Set Computing

### RJ

    Registered Jack

### RMF

    Rich Music Format

### RTF

    Rich Text Format

### RTP

    Realtime Transport Protocol

### RTSP

    Real Time Streaming Protocol
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## S
### S/MIME

    Secure Multipurpose Internet Mail Extensions

### SAM

    Security Accounts Manager

### SAPI

    Speech Application Programming Interface

### SC

    Standard Connector / Subscriber Connector

### SCP

    Secure Copy Protocol

### SCSI

    Small Computer System Interface

### SDH

    Synchronous Digital Hierarchy

### SDSL

    Single Line Digital Subscriber Line

### SET

    Secure Electronic Transaction

### SFF

    Small Form Factor

### SFTP

    Secure File Transfer Protocol

### SGML

    Standard Generalized Markup Language

### SHA-1

    Secure Hash Algorithm 1

### SLIP

    Serial Line Internet Protocol

### SMAU

    Smart Multistation Access Unit

### SMB

    Server Message Block

### SMF

    Single Mode Fiber

### SMS

    Storage Management Services

### SMTP

    Simple Mail Transfer Protocol

### SNMP

    Simple Network Management Protocol

### SOA

    Start of Authority

### SOHO

    Small Office / Home Office

### SONET

    Synchronous Optical Network

### SOP

    Standard Operating Procedures

### SPARC

    Scalable Processor Architecture

### SPS

    Standby Power Supply

### SPX

    Sequence Packet Exchange

### SQL

    Structured Query Language

### SSH

    Secure Shell

### SSI

    Server Side Include

### SSID

    Service Set Identifier

### SSL

    Secure Sockets Layer

### ST

    Straight Tip

### STP

    Shielded Twisted Pair

### SVC

    Switched Virtual Circuit
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## T
### T1

    T-Carrier Level 1

### TA

    Terminal Adapter

### TCL

    Terminal Control Language / Tool Command Language

### TCP

    Transmission Control Protocol

### TCP/IP

    Transmission Control Protocol/Internet Protocol

### TDM

    Time Division Multiplexing

### TDR

    Time-Domain Reflectometer

### TELNET

    Terminal Emulation for Networks

### TFTP

    Trivial File Transfer Protocol

### TIFF

    Tagged Image File Format

### TM

    Trademark

### TOS

    Type of Service

### TP

    Transaction Processing

### TTL

    Time to Live
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## U
### UDP

    User Datagram Protocol

### UID

    User ID

### UNC

    Universal Naming Convention

### UPS

    Uninterruptible Power Supply

### URL

    Uniform Resource Locator

### USB

    Universal Serial Bus

### USPTO

    United States Patent and Trademark Office

### UTP

    Unshielded Twisted Pair

### UUCP

    Unix to Unix Copy
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## V
### VAN

    Value Added Network

### VB

    Visual Basic

### VBI

    Vertical Banking Interval

### VDSL

    Very High Data Rate Digital Subscriber Line

### VLAN

    Virtual LAN

### VoIP

    Voice Over IP

### VPN

    Virtual Private Network

### VRML

    Virtual Reality Modeling Language
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## W
### W3

    World Wide Web

### W3C

    World Wide Web Consortium

### WAN

    Wide Area Network

### WAP

    Wireless Access Point / Wireless Application Protocol

### WAV

    Wave File

### WEP

    Wired Equivalent Privacy

### WINS

    Windows Internet Naming Service

### WinSock

    Windows Socket

### WMA

    Windows Media Audio

### WML

    Wireless Markup Language

### WPA

    Wi-Fi Protected Access

### VRML

    Virtual Reality Modeling Language

### WSH

    Windows Script Host

### WTS

    Windows Terminal Server

### WWW

    World Wide Web
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## X
### XHTML

    Extensible TyperText Markup Language

### XML

    Extensible Markup Language

### XMS

    Extended Memory Services

### XSL

    Extensible Style Language
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## Y

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## Z

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