Glossary
GL-2
Cisco Aironet 802.11a/b/g Wireless LAN Client Adapters (CB21AG and PI21AG) Installation and Configuration Guide
OL-4211-03
B
bandwidth Specifies the amount of the frequency spectrum that is usable for data transfer. It identifies the
maximum data rate that a signal can attain on the medium without encountering significan t p ower loss.
BPSK Binary phase shift keying. A modulation technique used by IEEE 802.11-compliant wireless LANs fo r
transmission at 1 Mbps.
broadcast key
rotation A security feature for use with dynamic WEP keys. If your client ad apt er use s LE AP, EAP-FAST,
EAP-TLS, or PEAP authentication and you enable this feature, the access point changes the dynamic
broadcast WEP key that it provides at the interval you select.
C
CCK Complementary code keying. A modulation technique used by IEEE 802.11b-compliant wireless LANs
for transmission at 5.5 and 11 Mbps.
CCKM Cisco Centralized Key Management. Using CCKM, authenticated client devices can roam from one
access point to another without any perceptible delay duri ng re assoc iat ion. An a cce ss p oint o n y our
network provides wireless domain services (WDS) and creates a cache of security credentials for
CCKM-enabled client devices on the subnet. The WDS access point's cache of credenti als dramati cally
reduces the time required for reassociation when a CCKM -enable d cli ent de v ice r oams to a ne w a cce ss
point.
CKIP Cisco Key Integrity Protocol. Cisco’s WEP key permutation technique based on an early algorithm
presented by the IEEE 802.11i security task group.
client A radio device that uses the services of an access point to communica te wir elessl y wi th o t her d evices
on a local area network.
CSMA Carrier sense multiple access. A wireless LAN media access method specified by the IEEE 802.11
specification.
CRC Cyclic redundancy check. A method of checking for error s i n a r ece ived packet.
D
data rates The range of data transmission rates supported by a device. Data rates are measured in megabits per
second (Mbps).
dBi A ratio of decibels to an isotropic antenna that is commonly used to measure antenna gain. The gre ater
the dBi value, the higher the gain and the more acute the angle of coverage.
DHCP Dynamic Host Configuration Protocol. A protocol available with many operating systems that
automatically issues IP addresses within a specified range to devices on the network. The device retain s
the assigned address for a specific administrator-defined period.