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understand principles behind network layer services: network layer service models forwarding versus
1. Network Layer 4-1
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
• NAT
• 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
2. Computer Networks: Routing 2
Network Layer Design
Goals
1. The services provided by the network layer
should be independent of the subnet topology.
2. The Transport Layer should be shielded from
the number, type and topology of the subnets
present.
3. The network addresses available to the
Transport Layer should use a uniform
numbering plan (even across LANs and WANs).
4. Computer Networks: Routing 4
Application
Transport
Internet
Network
Interface
Application
Transport
Internet
Internet
Network 1 Network 2
Machine A Machine B
Router/Gateway
Network
Interface
Network
Interface
Figure 8.3