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

Practice Questions

Q1
How many usable IP addresses are available in a subnet with a /29 subnet mask?
  1. 2
  2. 6
  3. 8
  4. 4

Questions & Step-by-Step Solutions

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.
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