Chapter 4:Network Layer ▣4.1 Introduction 4.5 Routing algorithms 4.2 Virtual circuit and o Link state datagram networks o Distance Vector 4.3 What's inside a o Hierarchical routing router 4.6 Routing in the ▣4.4IP:Internet Internet Protocol o RIP o OSPF o Datagram format o IPv4 addressing oBGP o ICMP ▣4.7 Broadcast and o IPv6 multicast routing Network Layer 4-20Network Layer 4-20 Chapter 4: Network Layer  4. 1 Introduction  4.2 Virtual circuit and datagram networks  4.3 What’s inside a router  4.4 IP: Internet Protocol  Datagram format  IPv4 addressing  ICMP  IPv6  4.5 Routing algorithms  Link state  Distance Vector  Hierarchical routing  4.6 Routing in the Internet  RIP  OSPF  BGP  4.7 Broadcast and multicast routing