Cisco OL-4015-08 User Manual page 644

Glossary
address translation
ADSL
aggressive mode
AH
AH-MD5-HMAC
AH-SHA-HMAC
AHP
algorithm
AMI
ARP
ASA
Cisco Router and Security Device Manager Version 2.2 User's Guide
GL-2
The translation of a network address and/or port to another network address/or
port. See also IP address, NAT, PAT,
asymmetric digital subscriber line.
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.
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.
Authentication Header with the MD5 (HMAC variant) hash algorithm.
Authentication Header with the SHA (HMAC variant) hash algorithm.
Authentication Header Protocol. A protocol that provides source host
authentication, and data integrity. AHP does not provide secrecy.
A logical sequence of steps for solving a problem. Security algorithms pertain
to either data encryption or authentication.
DES and 3DES are two examples of data encryption algorithms.
Examples of encryption-decryption algorithms include block cipher, CBC, null
cipher, and stream cipher.
Authentication algorithms include hashes such as MD5 and SHA.
alternate mark inversion.
Address Resolution Protocol—A low-level TCP/IP protocol that maps a node
hardware address (called a MAC address) to its IP address.
Adaptive Security Algorithm. Allows one-way (inside to outside) connections
without an explicit configuration for each internal system and application.
Static PAT.
OL-4015-08