GL-17
Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
Glossary
IDS Sensor An IDS sensor is hardware on with the Cisco IDS runs. IDS sensors can be
stand-alone devices, or network modules installed on routers.
IDM IDS Device Manager. IDM is software used to manage an IDS sensor.
IEEE Institute of Electrical and Electronics Engineers.
IETF Internet Engineering Task Force.
IGMP Internet Group Management Protocol. IGMP is a protocol used by IPv4 systems
to report IP multicast memberships to neighboring multicast routers
IKE Internet Key Exchange. IKE is a key management protocol standard used in
conjunction with IPSec and other standards. IPSec can be con figured without
IKE, but IKE enhances IPSec by providing additional features, flexibility, and
ease of configuration for the IPSec standard. IKE provides authentication of the
IPSec peers, negotiates IPSec keys, and negotiates IPSec security associations.
Before any IPSec traffic can be passed, each router/firewall/host must be able to
verify the identity of its peer. This can be done by manually entering preshared
keys into both hosts or by a CA service. IKE is a hybrid protocol that implements
the Oakley key exchange and Skeme key exchange inside the Internet Security
Association and Key Management Protocol (ISAKMP) framework. (ISAKMP,
Oakley, and Skeme are security protocols implemented by IKE.)
IKE negotiation A method for the secure exchange of private keys across non-secured networks.
IKE profile A group of ISAKMP parameters that can be mapped to different IP Security
tunnels.
IM Instant Messaging. A real-time communication service in which both parties are
online at the same time. Popular IM services include Yahoo! Messenger (YM),
Microsoft Networks Messenger, and AOL Instant Messenger (AIM).
IMAP Internet Message Access Protocol. A protocol used by clients to communicate
with an e-mail server. Defined in RFC 2060, IMAP enables clients to delete,
change the status, and otherwise manipulate messages on t he e-mail server as
well as retrieve them.
implicit rule An access rule automatically created by the router based on default rules or as a
result of user-defined rules.