Intrusion prevention system (IPS) Provides end-to-end protection for the network via a
network-based defense that can identify, classify, and stop known and unknown threats, including worms, network viruses, application threats, system intrusion attempts, and application misuse.

IP spoofing An attack in which an attacker falsifies packets’ source IP address (for example,causing the source IP address to be a trusted IP address).


IP telephony Similar to VoIP, sends voice traffic over an IP network. However, the primary distinction from a VoIP network is that an IP telephony environment contains endpoints that natively communicate using IP.

Isolated VLAN Ports belonging to an isolated VLAN lack Layer 2 connectivity between one another. However, they can communicate with a promiscuous post.

key pair In terms of a PKI, the key pair is composed of one public key and one private key.
These two keys work together to provide a means to both encrypt and decrypt data. The public key may be widely distributed publicly, but the private key should be closely held by its owner. Data encrypted with the public key can be decrypted only by the matching private key.

keyspace The keyspace of an algorithm represents a defined set of all possible key
values. For each key of n bits, a keyspace is produced that has 2n possible key values. This means that if 1 bit were added to the key, this would effectively double the size of the keyspace

Lightweight Extensible Authentication Protocol (LEAP) Uses a username/password
combination to perform authentication. Typically is found in a Cisco wireless LAN (WLAN) implementation.

LUN masking A Logical Unit Number is an address used by the SCSI protocol to differentiate an individual disk drive that makes up a common SCSI target device. LUN masking represents a defense against attacks. In this authorization process, a LUN is made available to some hosts and unavailable to other hosts.

Management Information Base (MIB) Information about a managed device’s resources and activity is defined by a series of objects. The structure of these management objects is defined by a managed device’s MIB.

Media Gateway Control Protocol (MGCP) Originally developed by Cisco and considered to be a client/server protocol. The client (such as an analog port in a voice-enabled router) can communicate with a server (such as a Cisco Unified Communications Manager server) via a series of events and signals. For example, the server could tell the client that if an attached
phone goes off-hook, play the signal of dial tone to that phone.