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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.

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What is subnetting?

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


If you have a class b network 172.121.225.0 and you want to do subnetting of 130 networks how many bits are used for subnetting?

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.


How is math used in computer networking?

In computer networking Math and binary operation are used in calculating subnet masks or in subnetting or in supernetting etc.


Why is VSLM not used in CCNA 1?

VSLM (Variable Length Subnet Masking) is not covered in CCNA 1 primarily because the course focuses on foundational networking concepts, including basic IP addressing and subnetting. VSLM is a more advanced topic that involves optimizing subnetting for more efficient IP address use, which is typically introduced in later courses when students have a stronger grasp of networking principles. The emphasis in CCNA 1 is on understanding the basics before delving into more complex addressing techniques.


What is the motivation behind using a custom subnet mask versus the default subnet mask?

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.