Intro To Computer Networks Week 7

        In week 7 we learned more about the link layer and local area networks. Once specific topic that was fairly important this week was ARP, address resolution protocol. Within a LAN, network devices such as network interface cards (NICs) are given unique MAC addresses which identifies the card. However, the layer 3 interface needs 32 bit address for forwarding. With ARP we can resolve IP addresses to MAC addresses. For a host to determine the MAC address of another without having previous knowledge of it, the host mush search it's cache to determine if it knows the MAC address of the other host. If the desired MAC address it's unknown, an ARP broadcast can be sent and the host machine can reply with its MAC address, updating the requesting machine's ARP table, and allowing the requesting machine to send a datagram.

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