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 18 questions

11. You have an interface on a router with the IP address of 192.168.192.10/29. What is the broadcast address the hosts will use on this LAN?

  • 192.168.192.15
  • 192.168.192.31
  • 192.168.192.63
  • 192.168.192.127
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12.  You have a network with a subnet of 172.16.17.0/22. Which is the valid host address?

  • 172.16.17.1 255.255.255.252
  • 172.16.0.1 255.255.240.0
  • 172.16.20.1 255.255.254.0
  • 172.16.18.255 255.255.252.0
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13. On a VLSM network, which mask should you use on point-to-point WAN links in order to reduce the waste of IP addresses?

  • /27
  • /28
  • /29
  • /30
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14.  To test the IP stack on your local host, which IP address would you ping?

  • 127.0.0.0
  • 1.0.0.127
  • 127.0.0.1
  • 127.0.0.255
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15. If a host on a network has the address 172.16.45.14/30, what is the subnetwork this host belongs to?

  • 172.16.45.0
  • 172.16.45.4
  • 172.16.45.8
  • 172.16.45.12
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16. Which configuration command must be in effect to allow the use of 8 subnets if the Class C subnet mask is 255.255.255.224?

  • Router(config)#ip classless
  • Router(config)#no ip classful
  • Router(config)#ip unnumbered
  • Router(config)#ip subnet-zero
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17. Using the illustration from the previous question, what would be the IP address of S0 if you were using the first subnet? The network ID is 192.168.10.0/28 and you need to use the last available IP address in the range. Again, the zero subnet should not be considered valid for this question.

  • 192.168.10.24
  • 192.168.10.62
  • 192.168.10.30
  • 192.168.10.127
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18. What is the subnetwork address for a host with the IP address 200.10.5.68/28?

  • 200.10.5.56
  • 200.10.5.32
  • 200.10.5.64
  • 200.10.5.0
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