Lesson 5

Dates: 2/15/2017
Linux networking
Linux System Administration


Link Layer Protocols

Provides Datagram (data) delivery between hosts physically connected via cables, hubs and switches (physical layer components).

Ethernet protocol.

  • Packet collisions.
  • Ethernet packet (simplified):
    Header Data Field (IP protocol data) CRC

  • The header (14 b): MAC addresses of the destination and source; type field for the network layer.
  • MAC address (6 bytes):
    00:60:08:CA:39:C3
    the first 3 bytes identify the vendor

  • Address Resolution Protocol (ARP): relates IP to MAC for the local hosts :
    /usr/sbin/arp -a
    ? (192.168.5.240) at 08:00:20:1A:FD:43 [ether] on eth0
    



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