Chapter 6: Network Layer

• Layer 3
• Responsibilities include:
• Insert information into the packet’s header so it can be properly addressed and routed.
• Actually rout the packets to their proper destination.
• The network layer’s protocols determine which path is the best path to send the packets.
• They do not ensure the delivery of the packets and rely on the transport layer to catch any problems and resend it if necessary.
• The Network Layer has routing protocols that build and maintain their routing tables, maps of the network.
• Some of the other protocols that work in the network layer are:
•  Internet Control Message Protocol (ICMP)
• Routing Information Protocol (RIP)
•  Open Shortest Path First (OSPF)
•  Broader Gateway Protocol (BGP)
•  Internet Group Management Protocol (IGMP)