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* Do you know what ARP is?

Suggested article: ARP (Address Resolution Protocol) – Why is it important?

The Address Resolution Protocol, or shortly ARP, is a network layer protocol that is very important for the proper operation of IP networks. It mainly serves for mapping an always changing Internet Protocol (IP) address to a fixed physical machine address - a Media Access Control (MAC) address, in a local-area network (LAN).

There are several different types of Address Resolution Protocols, which are the following:

  • Proxy ARP: A device on a network can be configured as a proxy ARP, which allows it to respond to ARP requests on behalf of other devices.
  • Gratuitous ARP: An ARP request or reply message that is sent by a device even though it hasn’t been asked for it.
  • Reverse ARP (RARP): A protocol that allows a device to determine its own IP address when it only knows its physical (MAC) address.
  • Inverse ARP (InARP): A protocol that performs the opposite function of traditional ARP. It maps IP addresses using the associated hardware addresses.

Without ARP, devices cannot identify each other on a precise network, and communication would not be possible.

If you want to discover more information, we recommend you to check the following detailed article about ARP!