Difference Between Subnetting and Supernetting

Subnetting is the method of separating an IP network in to subdivisions known as subnets. Computers associated with a sub network have a general group of very important bits in their IP addresses. As a result, this would divide the IP address into two parts in theory, as the network prefix and the rest of the field. On the other hand, supernetting is the method of combining a number of sub networks, which have a general Classless Inter Domain Routing (CIDR) routing prefix. Make sure you understand that supernetting is also known as route summarisation or route aggregation.

There are major differences between the two concepts. Subnetting is the method of dividing an IP network in to sub stations called subnets while, Supernetting is the method of mixing and matching manhy IP networks with a general network prefix. It is important to know that supernetting will cut down the number of entries in a routing table and they will also ease the routing process to make it simpler. Moreover, in subnetting, host ID bits (for IP addresses from a single network ID) are taken to be used as a subnet ID. Whereas, in supernetting, bits from the network ID are taken to be used as the host ID.

Instructions

  • 1

    Subnetting

    Method of separating an IP network in to sub divisions is known as subnetting. It divides an IP address in to two parts as the routing prefix or network and the rest field which will identify the particular host. CIDR notation comes in to write a routing prefix. It uses a slash to divide the networking beginning address and the duration of the network prefix in bits. For instance, in IPv4, 192.60.128.0/22 shows that 10 bits are allowed to the network prefix and the other 10 bits are allocated for the host address. Moreover, routing prefix can be indicated using the subnet mask. The subnet mask for 192.60.128.0/22 is 255.255.252.0 (11111111.11111111.11111100.00000000). Dividing the network area and the subnet portion of an IP address is performed by doing it bitwise and operation between the subnet mask and IP address.

  • 2

    Supernetting

    It was introduced as a solution to the issue of increasing size in routing tables. It also eases the routing process. The first 23 bits are the network region of the address and the remaining 9 bits are used as the host finder. Therefore, one address will show a lot of small networks.

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