What is subnetting? List advantages and disadvantages of the same.
subnetting • 4.2k  views


  • Subnetting allows you to divide one physical network whether a class A, B, or C into several smaller logical subnetworks.
  • The main idea of subnetting is borrowing bits from the host IP address and using them to create one or more networks within the network.
  • Furthermore, It permits using two or more local area networks (LANs) technology in the same network such as Ethernet and Toking ring.

Advantages of using subnetting:

  • It is useful to control and to reduce the network traffic by limiting number of broadcasts.

  • It is allowed any organization to subnet its network without needed to have a new network IP through an internet service provider (ISP).

  • Subnetting was so helpful to solve the problem of lacking IP addresses on the Internet.

  • Allowing to use two or more LAN technologies together in the same network.

  • Subnets also helpful to minimize the size of the routing tables on the internet since additional network numbers will not being added to the table.

a. When you want to isolate segments for security reasons such as accounting and sales segment.

b. When you want to isolate bad segments such as domination hosts which use most of the LAN Bandwidth.

Disadvantage Advantages of using subnetting:

  • Subnetting decreases the total number of IP addresses in the network but may need buying additional hardware such as a router. So, it may cost lots of money.

  • It cannot correct the lack of efficiency because companies still assign address block regarding to classes.

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