Let’s consider the operation of a learning switch in the context of a network in

Question

Let’s consider the operation of a learning switch in the context of a network in which 6 nodes labeled A through F are star connected into an Ethernet switch. Suppose that (i) B sends a frame to E, (ii) E replies with a frame to B, (iii) A sends a frame to B, (iv) B replies with a frame to A. The switch table is initially empty. Show the state of the switch table before and after each of these events. For each of these events, identify the link(s) on which the transmitted frame will be forwarded, and briefly justify your answers.

Explanation / Answer

Action Switch Table State Link(s) packet is forwarded to Explanation B send a frame to E Switch Learns interface Corresponding to MAC address of B A,C,D,E,F Since Switch table is empty , so switch does not know the interface corresponding to MAC address of E E Replies with a frame to B Switch Learns interface Corresponding to MAC address of E B Since Switch already know the interface corresponding to MAC address of B A send a frame to B Switch Learns interface Corresponding to MAC address of A B Since switch already knows the interface corresponding to MAC address of B B Replies with a frame to A Switch table state remains the same as before A Since switch already knows the interface corresponding to MAC address of A

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