Subnetting Questions and Answers
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
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43 questions
21. What does a subnet mask do
- Hides the IP address
- Explanation: A subnet mask separates the network and host parts of an IP address.
- Encrypts data packets
- Assigns MAC addresses
22. Which subnet mask represents a /24 network
- 255.0.0.0
- 255.255.0.0
- Explanation: A /24 subnet has 24 network bits, equal to 255.255.255.0.
- 255.255.255.252
23. How many usable hosts are available in a /30 subnet
- 1
- Explanation: A /30 subnet provides 4 addresses, 2 of which are usable.
- 4
- 6
24. What is the default subnet mask for a Class C network
- 255.0.0.0
- 255.255.0.0
- Explanation: Class C networks use a default mask of 255.255.255.0.
- 255.255.255.255
25. Which address is not assignable to a host
- Explanation: The network address identifies the subnet and cannot be assigned to a host.
- First host address
- Last host address
- Any private IP address
26. What is the broadcast address used for
- Identifying the router
- Explanation: The broadcast address sends packets to all hosts in the subnet.
- Assigning IP addresses
- Connecting different networks
27. How many subnets can be created using 3 borrowed bits
- 4
- 6
- Explanation: Number of subnets equals 2³, which is 8.
- 16
28. Which notation is used to represent the number of network bits
- Dotted decimal
- Binary notation
- Explanation: CIDR notation shows the number of network bits using a slash.
- Hexadecimal
29. What is the subnet mask for /26
- 255.255.255.0
- Explanation: /26 means 26 network bits, equal to 255.255.255.192.
- 255.255.255.224
- 255.255.255.240
30. How many usable hosts are in a /25 subnet
- 64
- Explanation: /25 provides 128 total addresses, 126 usable.
- 128
- 254