How many usable IP addresses are available in a subnet with a /29 subnet mask?

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Question: How many usable IP addresses are available in a subnet with a /29 subnet mask?

Options:

Correct Answer: 6

Solution:

A /29 subnet mask provides 8 total addresses, of which 6 are usable for hosts after excluding the network and broadcast addresses.

How many usable IP addresses are available in a subnet with a /29 subnet mask?

How many usable IP addresses are available in a subnet with a /29 subnet mask?

Step 1: Understand what a subnet mask is. A /29 subnet mask means that the first 29 bits of the IP address are used for the network part.
Step 2: Calculate the total number of addresses in a /29 subnet. The formula is 2^(32 - subnet bits). Here, it is 2^(32 - 29) = 2^3 = 8 total addresses.
Step 3: Identify the special addresses in the subnet. The first address is the network address, and the last address is the broadcast address.
Step 4: Subtract the network and broadcast addresses from the total addresses. So, 8 total addresses - 2 special addresses = 6 usable addresses for hosts.
Step 5: Conclude that in a /29 subnet, there are 6 usable IP addresses available for devices.

Subnetting – Understanding how subnet masks work and how to calculate the number of usable IP addresses in a subnet.
IP Addressing – Knowledge of the distinction between total addresses, usable addresses, network address, and broadcast address.