Answered: Q2C.Justify the usage of a MAC address at datalink layer along with IP address at network layer in the TCP/IP protocol suite.

Computer Networking: A Top-Down Approach (7th Edition)

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Author: James Kurose, Keith Ross

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Question

Q2C.Justify the usage of a MAC address at datalink layer along with IP address at network
layer in the TCP/IP protocol suite.
Consider a LAN with 4 hosts A,B,C,D and a default router R1 implemented with a switch
S1.Suppose Host A would like to send an IP datagram to Host B, and neither A's ARP
cache contains B's MAC address nor does B's ARP cache contain A's MAC address.
Further suppose that the switch S1's forwarding table contains entries for Host B and
router R1 only. Give the actions That will Host A and switch S1 perform to send the ARP
request message to B. Once Host B receives this ARP request message, it will send back
to Host A an ARP response message. But will it send an ARP query message to ask for A's
MAC address? Why? What will switch S1 do once it receives an ARP response message
from Host B?

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