3Com SuperStack 3 3250 Implementation Manual page 120

120 G
LOSSARY
bandwidth
baud
bridge
broadcast
broadcast storm
cache
Certificate Authority
Classless InterDomain
Routing (CIDR)
collision
CoS
CSMA/CD
The information capacity, measured in bits per second, that a channel
can transmit. The bandwidth of Ethernet is 10 Mbps, the bandwidth of
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.
CA See Certificate Authority.
Stores copies of frequently accessed objects locally to users and serves
them to users when requested.
An organization that issues Digital Certificates.
Routing between two subnets where the size of the subnet is explicitly
stated using a Variable Length Subnet Mask (VLSM) rather than being
implied by the class of the IP address.
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.
Cost of Service. A network prioritization scheme that sorts packets into
queues based on tagging or traffic type.
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