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 retransmitte d the
packet.
E
EAP Extensible Authentication Protocol. EAP is the protocol for the optional IEEE 802.1X wire less LAN
security featu re. 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 Sec ure 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 use s c arri er se nse m ultip le ac cess (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).