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1. Defined by datalink and physical protocalls

   • Size

2. MAC address - unique device identification

   • Types of addressing
     • Unicast - address to one device only
     • Broadcast - all device on network
     • Multicast - multiple devices on network
   • For Ethernet to Ethernet communication

3. Switches

   • Layer 2 device
     • Uses MAC address to forward decisions

4. IP addressing

   • Source to destination addressing
     • No need for MAC if on same LAN
     • If outside LAN must contain MAC address

5. ARP - Address Resolution Protocall

   • Used to determine a MAC address for a corresponding know IP address
     • Searches ARP table for MAC address
       • Found
         • Packet can be sent
       • Not found
         • ARP request sent
           • Contains
             • Des. MAC
             • Source MAC
             • Type
             • Destination host replies with the same information

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