Tuesday 5 July 2011

Switch

What is the difference between store-and-forward and cut-through switching?

Cut-through switching examines just the frame header, determining the output switch port through which the frame will be forwarded.


Store-and-forward examines the entire frame, header and data payload, for errors. If the frame is error free, it is forwarded out its destination switch port interface. If the frame has errors, the switch drops the frame from its buffers. This is also known as discarding the frame to the bit bucket.


What is the difference between Layer 3 switching and routing?

 The difference between Layer 3 switching and routing is that Layer 3 switches have hardware to pass data traffic as fast as Layer 2 switches.

 However, Layer 3 switches make decisions regarding how to transmit traffic at Layer 3 in the same way as a router. A Layer 3 switch cannot use WAN circuits or use routing protocols; a router is still required for these functions

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