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CISA QUESTION #6825
Question 1
Subnet Division Starting IP Ending IP
Original 192.168.1.1 192.168.1.254
After Split 192.168.1.1 192.168.1.126

An organization subdivides a network into two equal subnets. How many usable IP addresses are LOST in overhead per subnet?

  • 2✔️
  • 3
  • 4
Correct Answer Explanation

When an IP network is subdivided, each resulting subnet requires four specific addresses: network name, starting IP, ending IP, and broadcast IP. However, the network name and broadcast IP cannot be assigned to devices. Therefore, 2 addresses per subnet are consumed in overhead and lost from the usable address space.