Subnetting Questions and Answers

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Subnetting is one of the most important topics in networking, helping professionals efficiently allocate IP addresses and optimize network performance. This section presents a range of networking aptitude questions and answers with explanations focusing on subnet masks, CIDR notation, and IP calculations. Mastering these concepts is essential for certifications like Cisco CCNA and placement exams conducted by Infosys, Wipro, and TCS. The questions are designed to test both speed and conceptual accuracy. By practicing subnetting aptitude questions with solutions PDF, you can develop a strong foundation for network design and troubleshooting roles.

Subnetting

Showing 10 of 43 questions

31. Which IP class supports subnetting by default

  • Class A
  • Class B
  • Class C
  • Explanation: Subnetting can be applied to all IP address classes.
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32. What is the total number of addresses in a /28 subnet

  • 8
  • 12
  • 14
  • Explanation: /28 has 4 host bits, giving 2⁴ = 16 addresses.
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33. Which subnet mask allows the maximum number of hosts

  • /30
  • /28
  • /24
  • Explanation: /16 leaves more host bits, allowing more hosts.
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34. What happens when you increase the subnet mask length

  • Number of hosts increases
  • Number of subnets decreases
  • Explanation: Increasing the mask length reduces host bits.
  • IP address size increases
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35. Which of the following is a valid private IP address

  • 8.8.8.8
  • Explanation: 172.16.0.0 to 172.31.255.255 is a private IP range.
  • 200.10.5.1
  • 1.1.1.1
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36. What is VLSM used for

  • Fixed-length subnetting
  • Explanation: VLSM allows subnets of different sizes.
  • Encrypting IP packets
  • Address translation
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37. Which address represents the first usable host

  • Network address
  • Explanation: The first usable host is one more than the network address.
  • Broadcast address
  • Last address
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38. Which subnet mask is used for point-to-point links

  • 255.255.255.0
  • 255.255.255.128
  • Explanation: /30 is commonly used for point-to-point links.
  • 255.255.255.255
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39. How many bits are in an IPv4 address

  • 16
  • Explanation: IPv4 addresses are 32 bits long.
  • 64
  • 128
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40. Which of the following is a Class B default subnet mask

  • 255.0.0.0
  • Explanation: Class B networks use 255.255.0.0 as default.
  • 255.255.255.0
  • 255.255.255.252
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