Practice Quiz

Advanced Networking Administrator Test Prep

Category - CCNA

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John wants to divide his organization’s network into 6 subnets. He should be able to allocate a maximum of 25 hosts on each subnet. The organization’s network address is 202.142.16.5. Which of the following classful subnet masks should he use?
  1. 255.255.255.240
  2. 255.255.255.224
  3. 255.255.255.192
  4. 255.255.255.128
Explanation
Answer: B - The subnet mask that allows John to have 6 subnets with a maximum of 25 hosts per subnet is 255.255.255.224.

Key Takeaway: To divide a network such that a maximum of 6 subnets can be configured with at least 25 hosts per subnet, you should use the first 3 bits of the last octet as a part of the network ID. The other 5 bits should be used to identify the host in the subnet. Hence, the subnet mask is 255.255.255.224.
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