The table below lists initial isms and acronyms in common and current usage by members of the Information Technology community. These acronyms are used to discuss LAN, internet, WAN, routing and switching protocols, and their applicable organizations. [ 1 ] [ 2 ] [ 3 ] The table contains only current, common, non-proprietary acronyms that are specific to Information Technology. Most of these acronyms appear in IT career certification exams. Acronym Meaning Primary Applicability [ 4 ] Normative Reference ACK Acknowledgement Transport and other layers TCP/IP , for example. RFC 793 ACL Access control list Security, application layer Access control list , Cisco overview ADSL Asymmetric digital subscriber line Telecom ITU-T G.992.5 Annex M , for example AES Advanced Encryption Standard Security U.S. FIPS PUB 197 ANSI American National Standards Institute Organization ANSI ARP Address Resolution Protocol Link layer RFC 1122 ATM Asyn...
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