3. (a) When does a host use the ARP cache? Your answer should provide details of the algorithm. (b) Write the minimum routing table for the local router in Figure

1that allow the hosts to be connected to the Internet.[10 marksı (c) Provide diagrams and a detailed explain on either of the two following topics:[14 marksl Show how a DNS message is encapsulated in an Explain why TCP is called connection-oriented protocol and UDPis connection less.