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Discuss link layer connection in TCP/IP model.

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By Dipali Umre

  1. Local Network Focus:
    • The link layer deals with communication within the local network (or link) that a device is directly connected to.
    • It doesn’t involve sending data outside this local network, so it’s limited to devices on the same network segment.
  2. Communication Between Local Devices:
    • The link layer handles communication between devices on the same local network.
    • It helps in maintaining information about the local network, like its topology (how devices are connected).
  3. Key Protocols:
    • Important protocols in the link layer include:
      • Address Resolution Protocol (ARP): Resolves IP addresses to physical MAC addresses.
      • Reverse Address Resolution Protocol (RARP): Resolves physical MAC addresses to IP addresses.
      • Neighbor Discovery Protocol (NDP): Manages information about neighbors on the local network.
  4. Comparison with OSI Model:
    • The link layer in TCP/IP is often compared with the combination of the data link layer and physical layer in the OSI model.
    • While they cover similar ground, they are not exactly the same.
  5. Layering Consideration:
    • In TCP/IP, layering is not a strict design rule, unlike in the OSI model.
    • Direct comparisons between layers should be avoided, as layering in TCP/IP is considered less rigid.
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