ARP Process Well-Explained || ARP Encapsulation Step-By-Step || ARP 3

Your one-stop explanation on the concept of ARP. This content explains, using well-coordinated demonstrations, to describe the process by which a host obtains the MAC address mapped to an IP address of another host on a TCP/IP network. ARP process requires exchange of two messages: ARP request which is flooded on the link, i.e., sent as a broadcast message and received by all hosts on the link. ARP reply message which is sent directly as a unicast message after encapsulating within an Ethernet frame. Processing of a received ARP Packet is as follows.: 1. All hosts verify that they speak the hardware type and protocol type in the ARP message. 2. Any host that already has an entry for IP address of the sender simply updates the mapping in its ARP table with the sender’s hardware MAC address. Here, we make the assumption that all devices have no ARP records for PCA. 3. According to the packet reception rules defined in RFC 826, a host will only learn a new ARP mapping when the target protocol address in the ARP request message is its interface IP address. Meaning that all other hosts will discard this ARP message and not learn the new mapping. Some ARP implementations may require all devices to learn the new mapping irrespective of the target protocol address in the received ARP message. Don't forget to leave a comment and subscribe for more awesome content. References to this video can be found by following the links below: 1. The standard IETF documentation for ARP https://datatracker.ietf.org/doc/html/rfc826#section-100 2. Wikipedia https://en.wikipedia.org/wiki/Address_Resolution_Protocol