How many total usable host IP addresses are available in an IPv4 subnet configured with the subnet mask /28 (255.255.255.240)?
Answer and explanation
Correct answer: D. 14
- Step 1: Calculate total IP addresses in a /28 subnet: 32 bits - 28 network bits = 4 host bits. Total addresses = .
- Step 2: Subtract 2 reserved addresses (one for network ID and one for broadcast): Usable host addresses = .
Answer
14.
Why not the others: 16 is total addresses including network and broadcast; 30 is for a /27 subnet (); 28 confuses the CIDR prefix with host counts.
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