Importance and representation of subnet mask.

Asked By anonymous 7060 points N/A Posted on - 10/19/2011

Why subnet mask is important for IP addresses? How is a subnet mask is represented? What are the default subnet masks for the class A,B and C types of IP addresses?

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Answered By lee hung 75 points N/A #81123

Importance and representation of subnet mask.

Hi Sarah,

A subnet mask divides the network into parts,  which are crucial for performance and security purposes of the network. It also helps in identification of the network a computer is operating in and the routing tables.

Class A subnet Mask is 255.0.0.0, Class B subnet Mask is 255.255.0.0 and Class C subnet mask is 255.255.255.0

For class A, the subnet mask can support a wide range of computers in the network, in class B, the subnet can support quite a substantial number of computers but not like in A, but it is obviously more capable that C which holds a smaller number of PCs.

Hope this helps.

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Regards,

Lee Hung.

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• Posted on - 10/23/2011
• Question Category: ISPs & Hosting