It gets the packets across networks. It transfers data from a source network to destination network. This generally involves routing the packet across a network of networks. In Internet protocol suite, IP (Internet Protocol) performs the basic task of getting packets from source to destination. IP can carry data for a number of different upper layer protocols. These protocols are each identified by a unique protocol number. ICMP and IGMP are protocols 1 and 2 respectively. ICMP (Internet Control Message Protocol) is used to transmit diagnostic information about IP. IGMP (Internet Group Message Protocol) is used to manage IP multicast data. These protocols perform internetwork layer functions. All routing protocols like OSPF and RIP are also part of network layer.
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