CompTIA
220-801 · Question #992
220-801 Question #992: Real Exam Question with Answer & Explanation
The correct answer is B: 256. The netmask 255.255.255.0 is equivalent to a /24 prefix length. The last octet (0) represents 8 host bits. The total number of IP addresses in the block is 2^8 = 256. This includes 1 network address, 254 usable host addresses, and 1 broadcast address. The question asks for total
Question
How many total IP addresses are represented by the 255.255.255.0 netmask?
Options
- A128
- B256
- C512
- D1024
Explanation
The netmask 255.255.255.0 is equivalent to a /24 prefix length. The last octet (0) represents 8 host bits. The total number of IP addresses in the block is 2^8 = 256. This includes 1 network address, 254 usable host addresses, and 1 broadcast address. The question asks for total IP addresses - not usable hosts - so the answer is 256.
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