Subnetting & addressing
43 practice questions with explanations — 15 free to try
3 of these 43 questions are in the free 15-question taster · the full topic is part of Premium
PassNova has 43 Cisco CCNA practice questions on Subnetting & addressing, each with a clear explanation. A 15-question taster is free with no sign-up; the full bank is part of PassNova Premium. Updated for 2026.
Subnetting & addressing: example questions & answers
3 worked examples with answers and explanations below. Try 15 Cisco CCNA questions free in the browser; the full 43-question Subnetting & addressing bank is part of PassNova Premium.
How many bits are in an IPv4 address?
- A16
- B32✓
- C48
- D128
Answer: An IPv4 address is 32 bits long, expressed as four dotted-decimal octets.
Which subnet mask corresponds to the prefix length /26?
- A255.255.255.224
- B255.255.255.192✓
- C255.255.255.240
- D255.255.255.0
Answer: /26 means 26 network bits, giving 255.255.255.192 (the last octet 11000000 = 192).
How many usable host addresses are available in a /27 subnet?
- A14
- B30✓
- C32
- D62
Answer: A /27 has 5 host bits: 2^5 - 2 = 30 usable host addresses.