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Glossary
GL-3
Cisco Aironet 802.11a/b/g Wireless LAN Client Adapters (CB21AG and PI21AG) Installation and Configuration Guide
OL-4211-03
DSSS
Direct-sequence spread spectrum. A type of spread spectrum radio transmission that spreads its signal
continuously over a wide frequency band.
duplicate packets
Packets that were received twice because an acknowledgement got lost and the sender retransmitted the
packet.
E
EAP
Extensible Authentication Protocol. EAP is the protocol for the optional IEEE 802.1X wireless LAN
security feature. An access point that supports 802.1X and EAP acts as the interface between a wireless
client and an authentication server, such as a Remote Authentication Dial-In User Service (RADIUS) server,
to which the access point communicates over the wired network.
EAP-FAST
Extensible Authentication Protocol - Flexible Authentication via Secure Tunneling. An 802.1X
authentication type that is available for use with Windows 2000 and XP. With EAP-FAST, a username,
password, and PAC are used by the client adapter to perform mutual authentication with the RADIUS
server through an access point.
Ethernet
The most widely used wired local area network. Ethernet uses carrier sense multiple access (CSMA)
to enable computers to share a network and operates at 10, 100, or 1000 megabits per second (Mbps),
depending on the physical layer used.
F
file server
A repository for files so that a local area network can share files, mail, and programs.
fragmentation
threshold
The size at which packets are fragmented and transmitted a piece at a time instead of all at once. The
setting must be within the range of 64 to 2312 bytes.
full duplex
A means of communication whereby each node receives and transmits simultaneously (two-way). See
also half duplex.
G
gateway
A device that connects two otherwise incompatible networks together.
GHz
Gigahertz. One billion cycles per second. A unit of measure for frequency.
H
half duplex
A means of communication whereby each node receives and transmits in turn (one-way). See also full
duplex.
hexadecimal
A set of characters consisting of ten numbers and six letters (0-9, A-F, and a-f).