Classful and classless addressing
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Classful addressing divides IP addresses into classes A, B, C, D, and E, limiting flexibility and wasting addresses. Classless addressing, also known as CIDR, provides more flexibility by allowing companies to request the specific number of addresses needed rather than being restricted to block sizes. CIDR network addresses include a subnet mask to specify the network and host portions of the address, allowing discontiguous networks to be created from a classful address range.
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2) IP addressing including public vs private addresses, IPv4 and IPv6 address formats, classes of IPv4 addresses including class A, B, C, and private addresses.
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Ip address
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- MAC address is a unique number used to identify devices on a network and helps prevent unwanted access.
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- 1. Classful Vs Classless Address Hello friends in this post i am again going to tell you some more interesting concepts of networking.In this post i am going to tell you what is the difference between classfull and classless address. Classful addressing: In the classful addressing system all the IP addresses that are available are divided into the five classes A,B,C,D and E, in which class A,B and C address are frequently used because class D is for Multicast and is rarely used and class E is reserved and is not currently used.Each of the IP address belongs to a particular class that's why they are classful addresses.Earlier this addressing system did not have any name,but when classless addressing system came into existence then it is named as Classful addressing system.The main disadvantage of classful addressing is that it limited the flexibility and number of addresses that can be assigned to any device.One of the major disadvantage of classful addressing is that it does not send subnet information but it will send the complete network address. The router will supply its own subnet mask based on its locally configured subnets. As long as you have the same subnet mask and the network is contiguous, you can use subnets of a classful network address.
- 2. Classless Addressing: Classless addressing system is also known as CIDR(Classless Inter-Domain Routing).Classless addressing is a way to allocate and specify the Internet addresses used in inter- domain routing more flexibly than with the original system of Internet Protocol (IP) address classes.What happened in classful addressing is that if any company needs more than 254 host machines but far fewer than the 65,533 host addresses then the only option for the company is to take the class B address.Now suppose company needs only 1000 IP addresses for its host computers then in this (65533-1000=64533) IP addresses get wasted.For this reason, the Internet was, until the arrival of CIDR, running out of address space much more quickly than necessary. CIDR effectively solved the problem by providing a new and more flexible way to specify network addresses in routers.A CIDR network address looks like this: 192.30.250.00/15 The "192.30.250.00" is the network address itself and the "15" says that the first 15 bits are the network part of the address, leaving the last 17 bits for specific host addresses.One more advantage of classless addressing is that classless protocol sends subnet information. This allows you to create discontiguous networks with any given classful network address.