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The network layer (internet Layer in TCP/IP model) is the second layer of the TCP/IP model. IP (Internet Protocol), ARP (Address Resolution Protocol), RARP (Reverse Address Resolution Protocol), ICMP (Internet Control Message Protocol) and IGMP (Internet Group Management Protocol) are the protocols at this layer.

http://www.omnisecu.com/tcpip/internet-layer.htm

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The Network Layer in the TCP/IP model is responsible for routing data packets between different networks. It determines the best path for data to travel from the source to the destination through various interconnected networks. The Internet Protocol (IP) is the main protocol used at this layer to address and forward packets.

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Q: Network Layer of TCPIP model
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