Cisco IPS 7.1 Installation Manual page 433

Data Encryption Standard. A strong encryption method where the strength lies in a 56-bit key rather
DES
than an algorithm.
Address of a network device that is receiving data.
destination address
Dual In-line Memory Modules.
DIMM
demilitarized zone. A separate network located in the neutral zone between a private (inside) network
DMZ
and a public (outside) network.
Domain Name System. An Internet-wide hostname to IP address mapping. DNS enables you to convert
DNS
human-readable names into the IP addresses needed for network packets.
Denial of Service. An attack whose goal is just to disrupt the operation of a specific system or network.
DoS
dynamic random-access memory. RAM that stores information in capacitors that must be refreshed
DRAM
periodically. Delays can occur because DRAMs are inaccessible to the processor when refreshing their
contents. However, DRAMs are less complex and have greater capacity than SRAMs.
Data Terminal Equipment. Refers to the role of a device on an RS-232C connection. A DTE writes data
DTE
to the transmit line and reads data from the receive line.
Dynamic Trunking Protocol. A Cisco proprietary protocol in the VLAN group used for negotiating
DTP
trunking on a link between two devices and for negotiating the type of trunking encapsulation (ISL or
802.1q) to be used.
E
Ether Channel Load Balancing. Lets a Catalyst switch split traffic flows over different physical paths.
ECLB
Traffic leaving the network.
egress
Application of a specific algorithm to data to alter the appearance of the data making it
encryption
incomprehensible to those who are not authorized to see the information.
A component of the sensor designed to support many signatures in a certain category. Each engine has
engine
parameters that can be used to create signatures or tune existing signatures.
Large and diverse network connecting most major points in a company or other organization. Differs
enterprise network
from a WAN in that it is privately owned and maintained.
Used in regular expression. A character can be represented as its hexadecimal value, for example, \x61
escaped expression
equals 'a,' so \x61 is an escaped expression representing the character 'a.'
electrostatic discharge. Electrostatic discharge is the rapid movement of a charge from one object to
ESD
another object, which produces several thousand volts of electrical charge that can cause severe damage
to electronic components or entire circuit card assemblies.
An IPS message that contains an alert, a block request, a status message, or an error message.
event
One of the components of the IPS. A fixed-size, indexed store (30 MB) used to store IPS events.
Event Store
The XML entity written to the Event Store that represents an alert.
evIdsAlert
OL-24002-01
Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.1
Glossary
GL-7