Cisco IPS 7.1 Installation Guide download pdf (Page 386)

Glossary

GL-8

Cisco Intrusion Prevention System Appliance Hardware Installation Guide for IPS 7.1

OL-24002-01

fail closed

Blocks traffic on the device after a hardware failure.

fail open

Lets traffic pass through the device after a hardware failure.

false negative

A signature is not fired when offending traffic is detected.

false positive

Normal traffic or a benign action causes a signature to fire.

Fast Ethernet

Any of a number of 100-Mbps Ethernet specifications. Fast Ethernet offers a speed increase 10 times

that of the 10BaseT Ethernet specification while preserving such qualities as frame format, MAC

mechanisms, and MTU. Such similarities allow the use of existing 10BaseT applications and network

management tools on Fast Ethernet networks. Based on an extension to the IEEE 802.3 specification.

Fast flux

Fast flux is a DNS technique used by Botnets to hide phishing and malware delivery sites behind an

ever-changing network of compromised hosts acting as proxies. It can also refer to the combination of

peer-to-peer networking, distributed command and control, web-based load balancing and proxy

redirection used to make malware networks more resistant to discovery and counter-measures. The

Storm Worm is one of the recent malware variants to make use of this technique.

firewall

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.

Flood engine

Detects ICMP and UDP floods directed at hosts and networks.

flooding

Traffic passing technique used by switches and bridges in which traffic received on an interface is sent

out all the interfaces of that device except the interface on which the information was received

originally.

forwarding

Process of sending a frame toward its ultimate destination by way of an internetworking device.

fragment

Piece of a larger packet that has been broken down to smaller units.

fragmentation

Process of breaking a packet into smaller units when transmitting over a network medium that cannot

support the original size of the packet.

Fragment

Reassembly

Processor

A processor in the IPS. Reassembles fragmented IP datagrams. It is also responsible for normalization

of IP fragments when the sensor is in inline mode.

FTP

File Transfer Protocol. Application protocol, part of the TCP/IP protocol stack, used for transferring

files between network nodes. FTP is defined in RFC 959.

FTP server

File Transfer Protocol server. A server that uses the FTP protocol for transferring files between network

nodes.

full duplex

Capability for simultaneous data transmission between a sending station and a receiving station.

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