How many networks are supported in a Class C network?
Understand the Problem
The question is asking for the number of networks that can be supported within a Class C network in the context of subnetting in computer networking. Specifically, it looks for the mathematical calculation of possible networks based on the Class C addressing scheme.
Answer
4
Answer for screen readers
There are 4 possible networks in a Class C network when 2 bits are borrowed for subnetting.
Steps to Solve
- Class C Network Basics
In a Class C network, the IP address consists of 32 bits. The first three octets (24 bits) are used for the network part, while the last octet (8 bits) can be used for host addresses. Knowing this helps us determine how to calculate for networks.
- Determine Subnet Mask
The standard subnet mask for a Class C network is $255.255.255.0$. This means there are 8 bits available for hosts. To find the number of available subnets, we can borrow bits from the host portion.
- Calculate Available Networks
Using the formula for calculating networks:
$$ \text{Number of Networks} = 2^n $$
where $n$ is the number of bits borrowed for subnetting.
If we borrow 2 bits from the last octet, we can calculate:
$$ \text{Number of Networks} = 2^2 = 4 $$
- Number of Hosts Per Subnet
Determine the number of hosts available in each subnet remaining:
$$ \text{Number of Hosts} = 2^h - 2 $$
where $h$ is the number of bits remaining for hosts. In our case, borrowing 2 bits leaves us with 6 bits for hosts:
$$ \text{Number of Hosts} = 2^6 - 2 = 62 $$
- Conclude with Total Networks and Hosts
So, for each borrowed configuration, we have 4 networks, and each network can host 62 devices.
There are 4 possible networks in a Class C network when 2 bits are borrowed for subnetting.
More Information
In Class C subnetting, usually, the last octet is used to create subnets. By changing the subnet mask, you can effectively increase the number of networks while managing the available host spaces.
Tips
- Confusing the number of networks with the number of hosts. Remember to separate the calculations.
- Forgetting to subtract 2 from the host capacity for network and broadcast addresses, which reduces the number of usable hosts.
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