What is the purpose of the Address Resolution Protocol (ARP)? ls the size of the ARP packet fixed? Explain.

Subject Computer Network
NU Year Set: 4.(b) Marks: 3+2=5 Year: 2017

Short for Address Resolution Protocol, a network layer protocol used to convert an IP address into a physical address (called a DLC address), such as an Ethernet address. A host wishing to obtain a physical address broadcastsan ARP request onto the TCP/IP network. The host on the network that has the IP address in the request then replies with its physical hardware address.
There is also Reverse ARP (RARP)which can be used by a host to discover its IP address. In this case, the host broadcasts its physical address and a RARP server replies with the host's IP address.

The size of the ARP packet in Question 2 is 28 bytes. We need to pad the data to have the minimum size of 46. The size of the packet in the Ethernet frame is then calculated as 6 + 6 + 2 + 46 + 4 = 64 bytes

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