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You are here: Home » Subnet and Subnet Mask

By Abhishek Ghosh February 21, 2014 1:47 am Updated on February 21, 2014

Subnet and Subnet Mask

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Subnet combines multiple successive IP addresses using a subnet mask to binary boundaries under a common front. In case of IPv6, it is called the prefix. There are several techniques for connecting different subnets together. A scheme for subdividing networks was introduced in 1985 and 1992 it was standardized for the first time in RFC 950. In administratively independent areas, so-called autonomous systems, always one or more subnets are managed, which in turn can be subdivided into smaller subnets.

 

Subnet, Network Addressing and Routing

 

There are several techniques for connecting different subnets together. Can be connected using :

  1. Aphysical layer ( OSI Layer 1 ) by repeaters or hubs
  2. Link level ( OSI Layer 2 ) by bridges or switches
  3. A network layer ( OSI layer 3 ) using routers
  4. Transport level ( OSI layer 4 )
  5. Application ( OSI layer 7 ) via gateways .

 

In the simplest case, you can divide a network into subnets of fixed size (all subnets have the same size). However, due to the shortage of IP addresses , nowadays often variable-sized subnets are used.

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The separation of the subnet range is detected by means of bitwise mask of a certain part of the IP address of the subnet mask. This is obtained from an arbitrary address for the subnet containing the address belongs to the assuming this mask.

Subnets used as a representation of IP networks in the routing tables. By routing between subnets, the Internet is structured.

 

Subnet versus Subnet Mask

 

The subnet mask indicates which bytes (or what portion) of the address is the network ID. The mask consists of a sequence of ones followed by a sequence of zeros written in the same manner as an IP address. The mask determines all parameters of a subnet: network address, broadcast address (broadcast) and can be assigned to network nodes (hosts) addresses.

Subnet

Routers form the boundaries between subnets. Communication to and from other subnets is done through a specific port on a specific router, at least momentarily.

Subnets simplify routing, since each subnet is typically represented as a row in the routing tables in each connected router. The subnets were used before the introduction of IPv4 addresses. Subnets allow Classless Inter-Domain Routing (CIDR). For computers to communicate with a network, you need to have own IP numbers, but if we have two or more networks, it is easy to divide an IP address from all hosts on the network. This forms can split large networks into smaller networks.

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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About This Article

Cite this article as: Abhishek Ghosh, "Subnet and Subnet Mask," in The Customize Windows, February 21, 2014, February 3, 2023, https://thecustomizewindows.com/2014/02/subnet-and-subnet-mask/.

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