3Com 3824 Implementation Manual page 90

90 G
LOSSARY
baud
bridge
broadcast
broadcast storm
cache
collision
CSMA/CD
DHCP
DNS
Fast Ethernet is 100 Mbps, and the bandwidth of Gigabit Ethernet is
1000 Mbps.
The signalling rate of a line, that is, the number of transitions (voltage
or frequency changes) made per second. Also known as line speed.
A device that interconnects two LANs of a different type to form a
single logical network that comprises of two network segments.
Bridges learn which endstations are on which network segment by
examining the source addresses of packets. They then use this
information to forward packets based on their destination address. This
process is known as filtering.
A packet sent to all devices on a network.
Multiple simultaneous broadcasts that typically absorb all the available
network bandwidth and can cause a network to fail. Broadcast storms
can be due to faulty network devices.
Stores copies of frequently accessed objects locally to users and serves
them to users when requested.
A term used to describe two colliding packets in an Ethernet network.
Collisions are a part of normal Ethernet operation, but a sudden
prolonged increase in the number of collisions can indicate a problem
with a device, particularly if it is not accompanied by a general increase
in traffic.
Carrier-sense Multiple Access with Collision Detection. The protocol
defined in Ethernet and IEEE 802.3 standards in which devices transmit
only after finding a data channel clear for a period of time. When two
devices transmit simultaneously, a collision occurs and the colliding
devices delay their retransmissions for a random length of time.
Dynamic Host Control Protocol. A protocol that lets you centrally
manage and automate the assignment of Internet Protocol (IP)
addresses in an organization's network.
Domain Name System. This system maps a numerical Internet Protocol
(IP) address to a more meaningful and easy-to-remember name. When
you need to access another device on your network, you enter the
name of the device, instead of its IP address.