The network topology of Figure 6.10 has more than one cycle. Explain why the ICMP packets continue looping in the same cycle.
What will be an ideal response?
Though the topology has more than one cycle we notice that the packets loop in the same cycle.
This is because of the MAC forwarding table entries of the bridges. Topologically PC1, Router1 and
Router 2 is a loop. Messages from PC1 to PC4 will not be forwarded by Router 1 (PC4 entry for PortA).
Similarly messages coming along PC2 will not be forwarded by Router 2 (PC4 entry for PortA). However
these messages can loop in the other cycle of PC2 -> Router3 -> Router4 -> PC2
Similarly messages sent by PC4 to PC1 will not be forwarded by Router 1 if the message has been sent by
PC2 and viceversa. However these messages can loop in the other cycle of Router3 -> Router2 ->;
Router4 -> Router3
Thus though the topology has more than one cycle, the ICMP packets continue looping in the same cycle.
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