Do you STILL suck at subnetting?? (THE FINAL TEST) // EP 9

Do you STILL struggle with subnetting? NetworkChuck is here to help you conquer the final test in subnetting with VLSM (Variable Length Subnet Masks). In this video, you will learn how to subnet a subnet using VLSM, which allows for subnets of different sizes within a larger subnet. Starting with the largest host requirements and working down to the smallest, NetworkChuck will guide you through the process of slicing and dicing subnets. Sponsored by Boson Software, this video encourages you to practice and continue learning subnetting skills to become a subnetting master. So grab your coffee and get ready to level up your networking game with VLSM!

Can you subnet a subnet? The answer is a resounding yes! NetworkChuck presents the final challenge in subnetting with VLSM (Variable Length Subnet Masks). Using a given network and various host requirements, you will learn how to divide the network into smaller subnets of different sizes. By starting with the largest host requirement and progressively working down to the smallest, you will discover the power of VLSM in solving complex subnetting problems. With the support of Boson Software and additional resources like Network Chuck Academy, you have all the tools you need to excel in subnetting. So join the journey, sharpen your subnetting skills, and say goodbye to sucking at subnetting!

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Welcome to the final challenge in the subnetting series! In this video, we will be diving into Variable Length Subnet Masks (VLSM), a crucial skill in networking. VLSM allows us to create subnets within subnets, each with different sizes. By combining all the subnetting skills you’ve learned so far, you will be able to subnet a subnet using VLSM. So grab your coffee and get ready to enhance your subnetting skills!

Understanding Subnetting

What is subnetting?

Subnetting is the process of dividing a large IP network into smaller subnetworks, or subnets. It involves creating subnets by borrowing bits from the host portion of the IP address, which allows for better organization and more efficient use of IP addresses in a network.

Importance of subnetting in networking

Subnetting is a fundamental skill in networking that offers several benefits. It helps in optimizing network performance by reducing network congestion and improving network efficiency. Subnetting also enhances network security by creating separate broadcast domains and restricting the flow of traffic. Additionally, it allows for scalable and flexible network design as it provides the ability to accommodate different network sizes and requirements.

VLSM: Variable Length Subnet Masks

Explanation of VLSM

Variable Length Subnet Masks (VLSM) is an extension of subnetting that allows for the creation of subnets of varying sizes within a larger subnet. With VLSM, we can allocate IP addresses in a more efficient manner by matching the subnet mask to the specific needs of each subnet. This flexibility enables better utilization of IP addresses and promotes a more efficient network design.

Benefits of using VLSM

Using VLSM offers several advantages. First, it allows for more precise allocation of IP addresses. Each subnet can have its own unique subnet mask, ensuring that the right amount of address space is allocated to meet the specific requirements of the network segment. VLSM also helps in conserving IP addresses by minimizing IP address wastage. Additionally, it simplifies network management by creating smaller, more manageable subnets.

How VLSM allows for subnets of different sizes

VLSM works by subnetting a subnet. It allows us to further divide a larger subnet into smaller subnets, each with their own unique subnet mask and host requirements. By working from the largest host requirement to the smallest, we can allocate the appropriate amount of IP address space to each subnet. This flexibility in subnet sizing enables efficient IP address allocation and ensures that no IP address space is underutilized.

The Subnetting Process

Starting with the largest host requirement

When subnetting with VLSM, it is important to begin with the subnet that has the largest host requirement. By addressing this subnet first, we ensure that we allocate enough IP addresses to accommodate the necessary number of hosts. Starting with the largest requirement and working our way down to the smallest allows for a more organized and efficient subnetting process.

Working down to the smallest host requirement

After addressing the subnet with the largest host requirement, we move on to the subnet with the second-largest requirement, and so on, until we address the subnet with the smallest requirement. This systematic approach ensures that we allocate IP addresses accurately and do not waste any address space. By following this process, we can create a well-designed and optimized network.

Subnetting Subnets with VLSM

Step-by-step process of subnetting a subnet using VLSM

  1. Start by identifying the subnet with the largest host requirement.
  2. Convert the subnet mask of the original subnet into binary form.
  3. Determine the number of host bits needed to accommodate the host requirement of the subnet.
  4. Borrow the required number of host bits to create a new subnet mask.
  5. Save the allocated host bits and use the remaining bits to represent the network portion of the new subnet.
  6. Convert the new subnet mask back to decimal form.
  7. Build the network by incrementing the last octet of the original network address with the appropriate increment value, based on the new subnet mask.
  8. Repeat this process for each subsequent subnet, moving from the largest host requirement to the smallest.

Calculating subnets and subnet masks

To calculate subnets and subnet masks, we need to follow the steps mentioned in the previous section. By carefully considering the host requirements for each subnet, we can determine the number of host bits to borrow and create the appropriate subnet mask. Once we have the subnet mask, we can calculate the network address for each subnet by incrementing the last octet of the previous subnet’s network address.

Mastering Subnetting

Importance of practice in mastering subnetting skills

Mastering subnetting requires consistent practice. It is a skill that improves over time with hands-on experience. By continuously practicing subnetting, you will become more familiar with the process, develop a deeper understanding of IP addressing, and gain the confidence to subnet efficiently in real-world scenarios.

Continuing education and resources for subnetting

To further enhance your subnetting skills, it is important to continue learning and staying up-to-date with industry trends. There are various resources available that can help you deepen your understanding of subnetting, such as online courses, tutorials, and practice exams. Network Chuck Academy and Boson Software are two such resources that provide comprehensive training materials and practice exams specifically tailored for subnetting and CCNA preparation.

Boson Software: Subnetting Support

Introduction to Boson Software

Boson Software is a leading provider of network simulation software and practice exams for IT certifications. Their products are highly regarded within the networking community and are designed to help individuals prepare for exams like the CCNA.

Services offered by Boson

Boson Software offers a range of services to support your subnetting journey. They provide practice exams that closely resemble the CCNA exam, allowing you to test your subnetting knowledge and identify areas for improvement. Boson Software also offers a network simulator that allows you to practice subnetting and build networks in a virtual environment.

Practice exams for subnetting and CCNA preparation

The practice exams offered by Boson Software are an invaluable resource for subnetting and CCNA preparation. These exams help you evaluate your understanding of subnetting concepts and provide a realistic exam experience. By taking these practice exams, you can gain confidence in your subnetting skills and ensure that you are fully prepared for the CCNA certification.

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Network Chuck Academy

Overview of Network Chuck Academy

Network Chuck Academy is an online platform that provides comprehensive training materials for networking professionals. It offers a wide range of courses, including subnetting, that are designed to enhance your networking skills and knowledge.

Resources available for subnetting education

Network Chuck Academy offers resources specifically focused on subnetting education. These resources include video tutorials, practice exercises, and quizzes that allow you to practice subnetting concepts and reinforce your understanding. By taking advantage of these resources, you can further sharpen your subnetting skills and become a subnetting expert.


In conclusion, subnetting is a vital skill in networking, and mastering it can greatly enhance your ability to design and manage networks effectively. VLSM, in particular, allows for subnets of different sizes within a larger subnet, offering greater flexibility in IP address allocation.

Throughout this video, we learned the step-by-step process of subnetting a subnet using VLSM, starting with the largest host requirement and working down to the smallest. We also discussed the importance of practice and continuous learning in mastering subnetting skills.

We mentioned Boson Software as a valuable resource for subnetting support, offering practice exams and network simulators. Network Chuck Academy was also highlighted as an excellent platform for subnetting education.

Remember, practice is essential in becoming proficient at subnetting. Keep practicing, seek additional resources, and continue your subnetting journey to become a subnetting pro.

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