Address Resolution Protocol (ARP) - Definition - Networking

Q.  Which protocol is used to find the physical address of the node when its Internet address is known?
- Published on 22 Jun 15

a. Address Resolution Protocol (ARP)
b. Reverse Address Resolution Protocol (RARP)
c. ICMP
d. None of the above.

ANSWER: Address Resolution Protocol (ARP)

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    Discussion

  • Prajakta Pandit   -Posted on 26 Oct 15

    - ARP (Address Resolution Protocol) is used to find the physical address of the node when its Internet address is known.

    - The Internet is based on IP addresses. Data link protocols (Ethernet, FDDI, ATM) may have different (MAC) addresses.

    - The ARP protocols perform the translation between IP addresses and MAC layer addresses.

    - ARP is also said to be a protocol used to resolve address mapping between layers in LAN.

    - Why ARP ?

        - It provides MAC address 48 bit unique in the LAN.

        - Hardware addresses are not computable from protocol address.

        - Used static table in ARPANET.

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