How many subnets can be created from a Class C network with a default subnet mas

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Question: How many subnets can be created from a Class C network with a default subnet mask of 255.255.255.0 if 3 bits are borrowed?

Options:

Correct Answer: 4

Solution:

Borrowing 3 bits from the host portion allows for 2^3 = 8 subnets, but with 2 reserved for network and broadcast, 6 usable subnets remain.

How many subnets can be created from a Class C network with a default subnet mask of 255.255.255.0 if 3 bits are borrowed?

How many subnets can be created from a Class C network with a default subnet mask of 255.255.255.0 if 3 bits are borrowed?

Step 1: Understand that a Class C network has a default subnet mask of 255.255.255.0.
Step 2: Recognize that the default subnet mask means there are 8 bits available for hosts (the last octet).
Step 3: When we borrow 3 bits from the host portion, we are taking 3 bits from the 8 bits available for hosts.
Step 4: Calculate the number of subnets created by borrowing 3 bits using the formula 2^n, where n is the number of bits borrowed. Here, n = 3.
Step 5: Calculate 2^3, which equals 8. This means we can create 8 subnets.
Step 6: Understand that in networking, 2 of these subnets are reserved: one for the network address and one for the broadcast address.
Step 7: Subtract the 2 reserved subnets from the total subnets: 8 - 2 = 6.
Step 8: Conclude that there are 6 usable subnets available after borrowing 3 bits.

Subnetting – Understanding how to divide a network into smaller sub-networks (subnets) by borrowing bits from the host portion of the IP address.
Classful Networking – Knowledge of Class C networks and their default subnet masks, specifically 255.255.255.0.
Reserved Addresses – Awareness that in subnetting, two addresses are reserved in each subnet: one for the network and one for the broadcast.