CCNA 1 Subnetting Questions Blog

CCNA 1 Subnetting Questions

Subnetting is a crucial skill for network administrators and engineers. It allows for efficient utilization of IP addresses and helps in optimizing network performance. This blog post aims to provide you with some challenging CCNA 1 subnetting questions to enhance your understanding and practice.

Question 1: Calculate Subnet Masks

Given the IP address, calculate the subnet mask for the following scenarios:

  1. 10 subnets
  2. 60 hosts per subnet
  3. 256 hosts per subnet

Explain your thought process and provide the correct subnet masks for each scenario.

Question 2: Subnetting and VLSM

Consider the network, which needs to be divided into multiple subnets using Variable Length Subnet Masking (VLSM). Answer the following:

  1. How many subnets can be created?
  2. What is the maximum number of hosts each subnet can support?
  3. Create a subnetting plan that meets the requirements:
    • Subnet 1: 500 hosts
    • Subnet 2: 200 hosts
    • Subnet 3: 100 hosts

Question 3: CIDR and Supernetting

Discuss the concept of Classless Inter-Domain Routing (CIDR) and supernetting. Explain why these techniques are important for conserving IP addresses and maintaining scalable network architectures. Provide an example of supernetting and mention the benefits it offers.

Question 4: Subnetting Troubleshooting

Explain common subnetting mistakes that network administrators make and provide troubleshooting tips to identify and fix them. Discuss scenarios such as overlapping subnets, incorrect subnet masks, and mismatched IP address assignments.

Question 5: IPv6 Subnetting

Discuss the differences between IPv4 and IPv6 subnetting. Explain the advantages of subnetting in IPv6 and how it simplifies network configuration. Provide an example of subnetting in IPv6 and explain the benefits it offers.

Question 6: Real-World Subnetting

Provide a real-world scenario where subnetting was effectively utilized to optimize network performance. Discuss the challenges faced, the subnetting solution implemented, and the positive outcomes achieved.


Subnetting is a fundamental skill required for network professionals. By practicing subnetting questions and understanding its practical implications, you can become proficient in designing and maintaining efficient networks. Remember to apply subnetting principles in real-world scenarios to enhance your problem-solving skills. Happy subnetting!

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