Glossary
GL-14
Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
fidelity rating A number from 1 to 100 that indicates the confidence the rater has that a
signature will generate an accurate alert.
finger A software tool for determining whether a person has an account at a particular
Internet site. Many sites do not a llow incoming finger requests.
fingerprint The fingerprint of a CA certificate is the string of alpha numeric characters that
results from an MD5 hash of the whole CA certificate. Entities receiving a CA
certificate can verify its authenticity by comparing it to its known fingerprint.
This authentication is intended to ensure the integrity of communication
sessions by preventing “man-in-the-middle” attacks.
firewall A router or access server, or several routers or access servers, designated as a
buffer between any connected public networks and a private network. A firewall
router uses access lists and other methods to ensure the security of the private
network.
Flash
Flash memory
A memory chip which retains data without power. Software images can be stored
in, booted from, and written to Flash as necessary.
Frame Relay Industry standard, switched data link layer protocol that handles multiple virtual
circuits using HDLC encapsulation between connected devices. Frame Relay is
more efficient than X.25, the protocol for which it is general ly considered a
replacement.
FTP File Transfer Protocol. Part of the TCP/IP protocol stack, used for tran sferring
files between hosts.
G
global IKE policy An IKE policy that is global to a device, rather than affecting only a single
interface on that device.
gnutella A decentralized P2P file sharing protocol. Using an installed Gnutella client,
users can search, download and upload files across the Internet.