UGC NET PAPER 2 June 2019 Question 82 (Shift-I)

Question 82

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82. What is the name of the protocol that allows a client to send a broadcast message with its MAC address and receive an IP address in reply?

Options:

1. 1. ARP
2. 2. DNS
3. 3. RARP
4. 4. ICMP

Answer : 3 RARP

Explanation Question 82

Reverse Address Resolution Protocol

It is used to get IP address with the help of Physical address(MAC Address).

RARP was used by old diskless workstations. These old hosts don’t have a disk so there is nothing to store an IP address on. They do have a hardcoded MAC address though. When the workstation starts, it broadcasts a RARP request with its own MAC address.

On the same network as the hosts, we have a RARP server listening to the RARP requests. This server has a table that contains a combination of MAC and IP addresses. When it receives a RARP request, it checks its table to find the matching IP address for the MAC address in the RARP request packet. The RARP server then replies with a RARP reply to the host. When the host receives the RARP reply, it knows its IP address.

Reference : RARP (Reverse Address Resolution Protocol - Reverse ARP)

Reference 2 : Reverse Address Resolution Protocol

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