Computer Network: Study of RARP command and ARP command.

Object: Study ARP & RARP .Use ARP command to see ARP cache status .Show the output for ARP with following options:

1) –s          2) –a

ARP PROTOCOL

The ARP protocol plays a key role among Internet layer protocols relating to TCP/IP, since it enables the physical address of a network interface card corresponding to an IP address to be known. That is why it is called Address Resolution Protocol.

RARP PROTOCOL

RARP (Reverse Address Resolution Protocol) is much less used. It is a type of reverse directory of logical and physical addresses. 
In reality, the RARP protocol is essentially used for work stations without hard disks that want to know their physical address.The RARP protocol allows a work station to find out its IP address from a lookup table between MAC addresses (physical address) and IP addresses hosted by a gateway located on the same local area network (LAN).

The ARP protocol maps addresses between the Data Link Layer and the Network Layer of the OSI Model.The Data Link layer of TCP/IP networks utilizes MAC addresses, the Network Layer of TCP/IPnetworks utilizes IP addresses. 

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