Introduction of TCP/IP Network Layer

Features of TCP/IP Network Layer

  • Message delivery at the network layer does not give any guarantee.
  • It examines network or logical addresses in the data instead of physical addresses seen in the Data Link layer.
  • The network layer establishes, maintains, and terminates logical and/or physical connections.
  • The network layer is responsible for translating logical addresses or names into physical addresses.

Functions of TCP/IP Network Layer

Protocols of TCP/IP Network Layer

  • Network layer protocols are considered as management protocols that can be categrorised into :-
    • Routing protocols
    • Multicast group management protocols
    • Network-layer address assignment protocols
  • There are following TCP/IP network layer protocols –
(A) Internet Protocol(IP)
(B) Address Resolution Protocol(ARP)
(C) Reverse Address Resolution Protocol(RARP)
(D) Internet Control Message Protocol(ICMP)
(E) Internet Group Message Protocol(IGMP)
(F) Routing Information Protocol(RIP)
(G) Open Shortest Path First(OSPF) Protocol
(H) Border Gateway Protocol(BGP) 

IP (Internet Protocol)

  • IP is the best known TCP/IP protocol at the internet layer of TCP/IP model which provides the basic packet delivery service for all TCP/IP networks node addresses.

IP Header/Datagram Formats

IP Classes/IP Addressing

ARP (Address Resolution Protocol)

RARP ( Reverse Address Resolution Protocol)

ICMP (Internet Control Message Protocol)

IGMP (Internet Group Message Protocol)



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