QUESTION $1$

$[$TOTAL MARKS: $20]$

Refer to the topology and corresponding addresses given above when answering $($a$)$

and $($b$)$ below.

$($a$)$

$[10$ Marks$]$

Assume all MAC address tables and ARP caches are empty. PC$-$E successfully

pings PC$-$ A$.$ Next, PC$-$B successfully pings PC$-$C$.$ Provide the resulting updated

MAC address table contents for switches $S1,S$ and $S3.$ Document any assump$-$

tions.

Note: A successful ping is one that receives a reply.

$($b$)$

$[5$ Marks$]$

Given above are the content's of S$3\text{'}$s MAC address table when a ping addressed as

shown below arrives at S$3$ from PC$-$E$.$ How does S$3$ react? Explain your reasoning.

$($c$)$

$[5$ Marks$]$

Jimmy has an idea. Since MAC addresses are unique, he proposes abandoning IP

addresses and routing Internet traffic solely based on MAC addresses. Is Jimmy's

idea practical? Provide evidence to support your opinion.

$[$END OF QUESTION $1]$