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If a subnet has the CIDR block 192.168.10.0/28, how many hosts can it support?

medium📝 Predict Output Q5 of 15
AWS - VPC Fundamentals
If a subnet has the CIDR block 192.168.10.0/28, how many hosts can it support?
A30
B16
C14
D12
Step-by-Step Solution
Solution:

  1. Step 1: Calculate total IP addresses

    32 - 28 = 4 bits for hosts. Total IPs = 2^4 = 16.

  2. Step 2: Calculate usable hosts

    Usable hosts = total IPs - 2 (network and broadcast) = 16 - 2 = 14.

  3. Final Answer:

    14 hosts -> Option C

  4. Quick Check:

    Usable hosts = 2^(32-mask) - 2 [OK]
Quick Trick: Usable hosts = 2^(32-mask) - 2 [OK]
Common Mistakes:
  • Counting network and broadcast as hosts
  • Miscounting bits for hosts
  • Confusing total IPs with usable hosts

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