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Glossary
GL-2
Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
ACL
access control list. Information on a device that specifies which entities are
permitted to access that device or the networks behind that device. Access
control lists consist of one or more access control entries (ACE).
ACS
Cisco Secure Access Control Server. Cisco software that can implement a
RADIUS server or a TACACS+ server. The ACS is used to store policy databases
used by Easy VPN, NAC and other features to control access to the network.
address translation
The translation of a network address and/or port to another network address/or
port. See also IP address, NAT, PAT, Static PAT.
ADSL
asymmetric digital subscriber line.
aggressive mode
A mode of establishing ISAKMP SAs that simplifies IKE authentication
negotiation (phase 1) between two or more IPSec peers. Aggressive mode is
faster than main mode, but is not as secure. See main mode, quick mode.
AES
Advanced Encryption Standard
AES-CCMP
Advanced Encryption Standard-Counter Mode with Cipher Block Chaining
Message Authentication Code Protocol. AES-CCMP is required for Wi-Fi
Protected Access 2 (WPA2) and IEEE 802.11i wireless LAN security.
AH
Authentication Header. This is an older IPSec protocol that is less important in
most networks than ESP. AH provides authentication services but does not
provide encryption services. It is provided to ensure compatibility with IPSec
peers that do not support ESP, which provides both authentication and
encryption.
AH-MD5-HMAC
Authentication Header with the MD5 (HMAC variant) hash algorithm.
AH-SHA-HMAC
Authentication Header with the SHA (HMAC variant) hash algorithm.
AHP
Authentication Header Protocol. A protocol that provides source host
authentication, and data integrity. AHP does not provide secrecy.