GL-23
Cisco Router and Security Device Manager Version 2.2 User’s Guide
OL-4015-08
Glossary
physical interface A router interface supported by a network module that is instal led in the router
chassis, or that is part of the router’s basic hardware.
ping An ICMP request sent between hosts to determine whether a host is accessible
on the network.
PKCS7 Public Key Cryptography Standard No. 7.
PKI public-key infrastructure. A system of certification authorities (CAs) and
registration authorities (RAs) that provides support for the use of asymmetric
key cryptography in data communication through such functions as ce rtificate
management, archive management, key management, and token management.
Alternatively, any standard for the exchange of asymmetric keys.
This type of exchange allows the recipient of a message to trust the signature in
that message, and allows the sender of a message to encrypt it appropriately for
the intended recipient. See key management.
plaintext Ordinary, unencrypted data.
posture In a NAC implementation, the condition of a host at tempting access to the
network. Posture agent software running on the host communicates with the
NAD to report on the host’s compliance with the network security policy.
PPP Point-to-Point Protocol. A protocol that provides router-to-router, and
host-to-network connections over synchronous and asynchronous circuits. PPP
has built in security mechanisms, such as CHAP and PAP.
PPPoA Point-to-Point Protocol over Asynchronous Transfer Mode (ATM). Primarily
implemented as part of ADSL, PPPoA relies on RFC1483, operating in either
Logical Link Control-Subnetwork Access Protocol (LLC-SNAP) or VC-Mux
mode.
PPPoE Point-to-Point Protocol over Ethernet. PPP encapsulated in Ethernet frames.
PPPoE enables hosts on an Ethernet network to connect to remote hosts through
a broadband modem.