Classless addressing

When you finish this chapter, you should: Understand the concept of classless addressing, be able to find the first and last address given an IP address, be able to find the network address given a classless IP address, be able to create subnets from a block of classless IP addresses, understand address allocation and address aggregation.

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This chapter compare and contrast classful and classless IP addressing, review VLSM and explain the benefits of classless IP addressing, describe the role of the Classless Inter-Domain Routing (CIDR) standard in making efficient use of scarce IPv4 addresses.

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Chapter 6 introduce VLSM and CIDR. This chapter compare and contrast classful and classless IP addressing, review VLSM and explain the benefits of classless IP addressing, describe the role of the Classless Inter-Domain Routing (CIDR) standard in making efficient use of scarce IPv4 addresses.

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When you’re subnetting an IP address for a network you have two options: classful and classless. Classful subnetting is the simplest method. It tends to be the most wasteful because it uses more addresses than are necessary. In classful subnetting you use the same subnet mask for each subnet, and all the subnets have the same number of addresses in them. Classless addressing allows you to use different subnet masks and create subnets tailored to the number of users in each group. This technique is referred to as VLSM....

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Classful addressing
Easy to work out but very wasteful.
Routers and hosts still assume class subnet masks by default. Class A /8 255.0.0.0. 23-Jul-12 18.

Class B /16 255.255.0.0.
Class C /24 255.255.255.0.Classless addressing
Any suitable prefix can be used.
We (and devices) need to know what the prefix is. More flexible, less wasteful.

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RFC-1631 A short term solution to the problem of the depletion of IP addresses Long term solution is IP v6 (or whatever is finally agreed on) CIDR (Classless InterDomain Routing ) is a possible short term solution NAT is another NAT is a way to conserve IP addresses Hide a number of hosts behind a single IP address Use: 10.0.0.0-10.255.255.255, 172.16.0.0-172.32.255.255 or 192.168.0.0-192.168.255.255 for local networks

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Co pa e and contrast classful and classless Compare a d co as c ass u a d c ass ess IP addressing. Review VLSM and explain the benefits of classless IP addressing. Describe the role of the Classless Inter-Domain Inter Domain Routing (CIDR) standard in making efficient use of scarce IPv4 addresses In addition to subnetting, it became possible to summarize a large collection of classful networks into an aggregate route, or supernet.

42p 0984272663 27-04-2011 87 7   Download

VLSM and CIDR. Objectives: Compare and contrast classful and classless IP addressing. Review VLSM and explain the benefits of classless IP addressing. Describe the role of the Classless Inter-Domain Inter Domain Routing (CIDR) standard in making efficient use of scarce IPv4 addresses In addition to subnetting, it became possible to summarize a large collection of classful networks into an aggregate route, or supernet.

42p thanhtung_hk 05-11-2010 126 34   Download