CCNA Exam Subnetting Questions Blog

CCNA Exam Subnetting Questions

In this blog post, we will go through a series of subnetting questions that are commonly found in the Cisco Certified Network Associate (CCNA) exam. Subnetting is a fundamental skill for network engineers, and having a strong understanding of subnetting is crucial for designing and troubleshooting networks.

Question 1: Subnetting Basics

Given an IP address of, how many usable hosts are there in each subnet when using a /27 subnet mask?

To answer this question, we need to understand that a /27 subnet mask would have 3 bits for host addresses, resulting in 2^3 – 2 = 6 usable host addresses in each subnet.

Question 2: Variable Length Subnet Masking (VLSM)

Given a network with the IP address of, design a VLSM scheme that provides:

  • 2 subnets with 200 hosts each
  • 4 subnets with 50 hosts each
  • 8 subnets with 25 hosts each

To solve this question, we need to start with the largest requirement, which is 2 subnets with 200 hosts each. This would require a /23 subnet mask (2^9 – 2 = 510 hosts per subnet). We can then allocate appropriate subnet masks for the remaining requirements, ensuring that they are smaller than the previous masks used.

Question 3: Subnetting and Routing

You have been given the network to be divided into multiple subnets. One of the subnets needs to support at least 70 hosts. Design a subnetting scheme that allows for growth and efficient use of IP addresses.

To solve this question, we can choose a /26 subnet mask (2^6 – 2 = 62 hosts per subnet) that allows for 64 host addresses. This would be sufficient for the current requirement of 70 hosts, while also considering future growth. Additionally, this leaves 2 host addresses for network and broadcast addresses.

Question 4: Subnetting and VLANs

You need to create 4 VLANs in a network. Each VLAN requires a maximum of 30 hosts. Determine an appropriate subnetting scheme to address the VLANs.

In this scenario, we can use a /27 subnet mask (2^5 – 2 = 30 hosts per subnet) to accommodate the requirement for each VLAN. We can allocate consecutive subnets for each VLAN within the available IP address range.

Question 5: IPv6 Subnetting

Convert the IPv4 address to its IPv6 equivalent using IPv6 subnetting rules.

To answer this question, we can convert the given IPv4 address to its corresponding IPv6 address by grouping the IPv4 address into two hexadecimals, separating them with colons, and adding the IPv6 prefix. For example, the IPv6 equivalent of the given address would be 2002:c0a8:3200::/48.

These subnetting questions are just some examples of what you might encounter in the CCNA exam. It is important to practice subnetting regularly to build confidence and improve your subnetting skills. Remember to review and understand the subnetting rules and calculations before taking the exam.

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