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· Interconnect
LANs of different types
· Example ethernet
and token ring
· These differ in
frame format, opeartion and speed and these issues to be taken
care of
· Since the frame
formats are different reformatting is done and new FCS is used.
But adds processing overhead.
· Since the data
rate is different the bridge should have sufficient buffering capacity
· Two approaches
used are : translational bridging
source route transparent bridging
Switch
• used to concentrate connectivity
• combine the connectivity of a
hub with the traffic regulation of a bridge
• switch frames from incoming
ports to outgoing ports providing each port with full
bandwidth
• provide separate data paths
switch functions
– Address learning
– Forward/filter decision
– Loop avoidance
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