Wireless Access Point
Glossary of Terms 609
CDP
(Cisco Discovery Protocol) CDP is a layer 2 network protocol which runs on most
Cisco equipment and some other network equipment. It is used to share
information with other directly connected network devices. Information such as
the model, network capabilities, and IP address is shared. Wireless APs can both
advertise their presence by sending CDP announcements, and gather and display
information sent by neighbors.
cell
The basic geographical unit of a cellular communications system. Service
coverage of a given area is based on an interlocking network of cells, each with a
radio base station (transmitter/receiver) at its center. The size of each cell is
determined by the terrain and forecasted number of users.
channel
A specific portion of the radio spectrum — the channels allotted to one of
the wireless networking protocols. For example, 802.11ac and 802.11g use 14
channels in the 2.4 GHz band, only 3 of which don't overlap (1, 6, and 11).
CoS
(Class of Service) A category based on the type of user, type of application,
or some other criteria that QoS systems can use to provide differentiated classes of
service.
default gateway
The gateway in a network that a computer will use to access another network if
a gateway is not specified for use. In a network using subnets, a default gateway
is the router that forwards traffic to a destination outside of the subnet of
the transmitting device.
DHCP
(Dynamic Host Configuration Protocol) A method for dynamically assigning IP
addresses to devices on a network. DHCP issues IP addresses automatically
within a specified range to client devices when they are first powered up.
DHCP lease
The DHCP lease is the amount of time that the DHCP server grants to the DHCP
client for permission to use a particular IP address. A typical DHCP server allows
its administrator to set the lease time.
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