Peterson Davie 3.4

Question

Give forwarding tables for switches $S1$ to $S4$ in Figure 3.46. Each switch should have a default routing entry, chosen to forward packets with unrecognized destination addresses toward OUT. Any specific destination table entries duplicated by the default entry should then be eliminated.

Answer 1

Host               incoming interface                 outgoing interface

A,B                       1,2                                               3

                              1,3                                             2

C                            2,3                                             1

D                              2                                                1