文档介绍：Chapter work Layer
working: A Top Down Approach Featuring the , 3rd edition. Jim Kurose, Keith Ross Addison-Wesley, July 2004.
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All material copyright 1996-2005
Kurose and . Ross, All Rights Reserved
1
Network Layer
Chapter 4: Network Layer
Chapter goals:
understand principles work layer services:
network layer service models
forwarding versus routing
how a router works
routing (path selection)
dealing with scale
advanced topics: IPv6, mobility
instantiation, implementation in the
2
Network Layer
Chapter 4: Network Layer
4. 1 Introduction
Virtual circuit and works
What’s inside a router
IP: Protocol
Datagram format
IPv4 addressing
ICMP
IPv6
Routing algorithms
Link state
Distance Vector
Hierarchical routing
Routing in the
RIP
OSPF
BGP
Broadcast and multicast routing
3
Network Layer
Network layer
transport segment from sending to receiving host
on sending side encapsulates segments into datagrams
on rcving side, delivers segments to transport work layer protocols in every host, router
Router examines header fields in all IP datagrams passing through it
network
data link
physical
network
data link
physical
network
data link
physical
network
data link
physical
network
data link
physical
network
data link
physical
ne