Summary: A subnet mask is a way of telling your computer or router what network addresses it can consider local and which are remote.mcsgul@Yahoo.com
Subnetting is a technique used to break down (or partition) networks into subnets.
As we are using a class B network for the Subnetting and we have to make a total of at least 130 subnetworks...so, class B default subnet mask is 255.255.0.0 or 16 bits for networkingand we have to make 130 sunets. so it will come under the block size of 256 or we need 8 bits more to make 130 subnets.so our answer is 16+8=24ie, we will use subnet mask of 255.255.255.0 for this class B address.
In computer networking Math and binary operation are used in calculating subnet masks or in subnetting or in supernetting etc.
Definition: A subnet is a logical grouping of connected network devices. Nodes on a subnet tend to be located in close physical proximity to each other on a LAN.The pourpose of subnetting is not to provide extra addresses, but to keep network data separated to prevent congestion.
A default subnet mask gives you classful addressing on octet boundaries. A non-default subnet mask implies that you are subnetting a larger network into several smaller ones.
Variable Length Subnet Mask (VLSM) is the new and efficient way to create Networks as compared to the old Fixed Length subnet mask. In Fixed length subnet masks networks there are 2 categories - the basic is A,B & C subnets and the second is fixed subnets that are created from these basic subnets. But in either of the methods there is lots of IP wastage, as different sections of the network will vary in the number of hosts connected to that network. Wastage is more in the first classic way of networks. It is minimized with the help of subnetting, but the problem still exists as some network segments may contain very less hosts but has to use the same subnet masks as the entire network and thus waste IPs. While when we use VLSM different network segments may contain different subnets as per there requirement and while even doing so they will still be able to interact with each other using routers. The 2 main benefits of VLSM are - 1) Because of different subnet masks the broadcast from one subnet is not transmitted to other subnets. Thus saves lots of bandwidth. 2) It saves lots of IP,which is wasted instead. Hope This helps Happy Networking -- By MyNarutoAnime
segmentation
Devices interpret subnetting information on a LAN by determining where the traffic originated and routing it to the appropriate area. By creating subnets, it is possible to have segregated areas of a network.
There is no need to use subnetting if you have no wish to further divide up your network into smaller, logical networks.
Loose of ip address
Yes. Subnetting separates a network into multiple logically defined segments, or subnets.
one number of host bits must be left when you doing subnetting.
12
Subnetting is the practice of dividing a network into two or more networks.
172.16.1.0 24
126
Subnetting allows you to create multiple local networks within a network. For more details use this site: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800a67f5.shtml
Subnetting Bodry