25-05-2012, 04:48 PM
Internetworking
CN Chapter 3IP.ppt (Size: 4.03 MB / Downloads: 45)
What is internetwork
An arbitrary collection of networks interconnected to provide some sort of host-host to packet delivery service
What is IP
IP stands for Internet Protocol
Key tool used today to build scalable, heterogeneous internetworks
It runs on all the nodes in a collection of networks and defines the infrastructure that allows these nodes and networks to function as a single logical internetwork
IP Service Model
Packet Delivery Model
Connectionless model for data delivery
Best-effort delivery
It is an unreliable service which results in :
packets are lost
packets are delivered out of order
duplicate copies of a packet are delivered
packets can be delayed for a long time
Global Addressing Scheme
Provides a way to identify all hosts in the network
Classless Addressing
CIDR tries to balance the desire to minimize the number of routes that a router needs to know against the need to hand out addresses efficiently.
CIDR uses aggregate routes
Uses a single entry in the forwarding table to tell the router how to reach a lot of different networks
Breaks the rigid boundaries between address classes
Summary
We have looked at some of the issues involved in building scalable and heterogeneous networks by using switches and routers to interconnect links and networks.
To deal with heterogeneous networks, we have discussed in details the service model of Internetworking Protocol (IP) which forms the basis of today’s routers.
We have discussed in details two major classes of routing algorithms
Distance Vector
Link State
CN Chapter 3IP.ppt (Size: 4.03 MB / Downloads: 45)
What is internetwork
An arbitrary collection of networks interconnected to provide some sort of host-host to packet delivery service
What is IP
IP stands for Internet Protocol
Key tool used today to build scalable, heterogeneous internetworks
It runs on all the nodes in a collection of networks and defines the infrastructure that allows these nodes and networks to function as a single logical internetwork
IP Service Model
Packet Delivery Model
Connectionless model for data delivery
Best-effort delivery
It is an unreliable service which results in :
packets are lost
packets are delivered out of order
duplicate copies of a packet are delivered
packets can be delayed for a long time
Global Addressing Scheme
Provides a way to identify all hosts in the network
Classless Addressing
CIDR tries to balance the desire to minimize the number of routes that a router needs to know against the need to hand out addresses efficiently.
CIDR uses aggregate routes
Uses a single entry in the forwarding table to tell the router how to reach a lot of different networks
Breaks the rigid boundaries between address classes
Summary
We have looked at some of the issues involved in building scalable and heterogeneous networks by using switches and routers to interconnect links and networks.
To deal with heterogeneous networks, we have discussed in details the service model of Internetworking Protocol (IP) which forms the basis of today’s routers.
We have discussed in details two major classes of routing algorithms
Distance Vector
Link State