Thursday, 15 September 2011

What is SUBNET ?

          Believe me friends finding topics for writing blogs is very very difficult so now I have started writing blog on topics which I had gone through before and had feel that topic difficult. many people feel that writing blog is very easy you have to just copy paste materials from here and there but believe me it is very difficult to get the idea of topic in first place .and you are reading this topic on this blog because the information is there , you were not going to search on internet for topics like subnet,proxy server,cloud computing so I write this topics so that any doubt which you would be having in future is cleared now itself. so this is the new topic which i will share with you'll.
so friends lets start with our topic for today "WHAT IS SUBNET???"
so now what is SUBNET ?
       A subnetwork, or subnet, is a logically visible subdivision of an IP network. The practice of dividing a network into subnetworks is called subnetting. All computers that belong to a subnet are addressed with a common, identical, most-significant bit-group in their IP address. This results in the logical division of an IP address into two fields, a network or routing prefix and the rest field. The rest field is a specific identifier for the computer or the network interface.
create a subnet by dividing the host identifier.
                The routing prefix is expressed in CIDR notation(CIDR notation is a compact specification of an Internet Protocol address and its associated routing prefix) It is written as the first address of a network followed by the bit-length of the prefix, separated by a slash (/) character.For example, is the prefix of the Internet Protocol Version 4 network starting at the given address, having 24 bits allocated for the network prefix, and the remaining 8 bits reserved for host addressing. The IPv6 address specification 2001:db8::/32 is a large network for 296 hosts, having a 32-bit routing prefix. In IPv4 the routing prefix is also specified in the form of the subnet mask, which is expressed in quad-dotted decimal representation(Dot-decimal notation is a presentation format for numerical data) like an address. For example, is the network mask for the prefix.Traffic between subnetworks is interchanged with special gateway computers called routers; they constitute logical or physical borders between the subnets.
if you want more information on this topic you can click here to know more on subnet