Appendix A. Glossary of Terms

• 3DES—Triple DES. See DES for further details.

• AAA—Authentication, authorization, and accounting (pronounced “triple a”).

• ACK—Acknowledgment bit in a TCP frame.

• ACL—Access control list. A list of rules that can be applied to traffic entering a network device or other computing resource. These rules are most often enforced based on the Layer 3 (L3) and Layer 4 (L4) information in a packet.

• AES—Advanced Encryption Standard. The newest standard for data confidentiality from the U.S. government. Over time, this will replace DES in most deployments.

• APNIC—Asia Pacific Network Information Center. A nonprofit Internet registry organization for the Asia Pacific region.

• ARIN—American Registry for Internet Numbers. ...

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