Friday, December 16, 2011

Bridges

Bridges--A bridge operates in both the physical and the data link layer. As a physical layer
device, it regenerates the signal it receives. As a data link layer device, the bridge can
check the physical (MAC) addresses (source and destination) contained in the frame.A bridge has filtering capability. It can check the destination address of a frame and
decide if the frame should be forwarded or dropped. If the frame is to be forwarded, the
decision must specify the port. A bridge has a table that maps addresses to ports.
A bridge does not change the physical (MAC) addresses in a frame.
  A two-layer switch is a bridge, a bridge with many ports and a design that allows better (faster) performance.A bridge has filtering capability.

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