Difference between ARP and RARP
ARP: The address resolution protocol (ARP) is used to associate the 32 bit logical/IP address with the 48 bit physical address. ARP can find the physical address of the receiver and for that it has to know the internet address of that node.
RARP: Reverse Address Resolution Protocol allows a host to find out its IP address when its physical address is known. When a computer is connected to a network for the first time then RARP is used.
| ARP | RARP |
|---|---|
| 1. ARP means Address Resolution Protocol. | 1. RARP means Reverse Address Resolution Protocol. |
| 2. Retrieves the physical address of the receiver when its logical address is known. | 2. Retrieves the logical address of a host when its physical address is known. |
| 3. ARP is used to map 32 bit logical address to 48 bit physical address. | 3. RARP is used to map 48 bit physical address to 32 bit logical address. |
| 4. In ARP local hosts maintain the ARP table. | 4. In RARP, RARP server maintain the RARP table. |
| 5. ARP reply is used by the ARP table for the update procedure in ARP table management | 5. RARP reply is used by the RARP table for the configuration of IP addresses in RARP table management. |
| 6. ARP is used by hosts and routers for knowing the physical address of other hosts and routers in the network. | 6. Small amount of users having less facilities use RARP. |
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Contributed By: Romana Rahman Ema