Subnetting & addressing
43 free practice questions with explanations
PassNova has 43 free Cisco CCNA practice questions on Subnetting & addressing, each with a clear explanation. Practise them in the browser with instant feedback — 100% free, no sign-up, on any device. Updated for 2026.
Subnetting & addressing: example questions & answers
Here are 6 example questions from this topic. Practise the full set of 43 free in the browser.
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How many bits are in an IPv4 address?
- A 16
- B 32 ✓
- C 48
- D 128
Answer: An IPv4 address is 32 bits long, expressed as four dotted-decimal octets.
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Which subnet mask corresponds to the prefix length /26?
- A 255.255.255.0
- B 255.255.255.192 ✓
- C 255.255.255.224
- D 255.255.255.240
Answer: /26 means 26 network bits, giving 255.255.255.192 (the last octet 11000000 = 192).
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How many usable host addresses are available in a /27 subnet?
- A 14
- B 30 ✓
- C 32
- D 62
Answer: A /27 has 5 host bits: 2^5 - 2 = 30 usable host addresses.
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Which IPv4 address class does 172.16.0.0 belong to?
- A Class A
- B Class B ✓
- C Class C
- D Class D
Answer: 172.16.0.0 has a first octet of 172, which falls in the Class B range (128-191).
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What is the network address of the host 192.168.10.74 with a subnet mask of 255.255.255.240?
- A 192.168.10.64 ✓
- B 192.168.10.72
- C 192.168.10.0
- D 192.168.10.80
Answer: A /28 (255.255.255.240) has a block size of 16. 74 falls in the 64-79 range, so the network is 192.168.10.64.
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What is the broadcast address for the subnet 192.168.1.0/26?
- A 192.168.1.63 ✓
- B 192.168.1.64
- C 192.168.1.127
- D 192.168.1.255
Answer: A /26 has a block size of 64. The first subnet is 0-63, so the broadcast address is 192.168.1.63.