Subnetting in the /1 - /16 range - Subnetting Mastery - Part 7 of 7

Summary

The final video of Practical Networking's IPv4 Subnetting Mastery series dives into solving subnetting issues in the first and second octets, tying back concepts from earlier videos. By extending the existing cheat sheet to work with /1 through /16 CIDR notations, viewers learn to calculate subnet masks, group sizes, and solve example problems adeptly. From tackling a /12 problem in the second octet to guiding through a /2 problem covering the entire IPv4 address range, the video demystifies subnetting's complexities. It emphasizes the importance of practice for achieving subnetting mastery and directs users to additional resources for further learning.

Highlights

• Seventh video in the subnetting series tackles problems in the first two octets! 🎯
• Learn to use the subnetting cheat sheet effectively for /1 to /16 ranges! 🚀
• Practice subnetting for 10.50.1.11.2/12 and IPv4's entire address space! 🧠
• Around 1 billion addresses covered in a /2 subnetting problem! 🤯
• Subnetting mastery means solving problems quickly and accurately! ⏱️

Key Takeaways

• Extend your subnetting skills to the 1st and 2nd octets! 💪
• Learn how to solve subnetting with CIDR values as low as /1! 🔍
• Master the use of subnetting cheat sheets for quick solutions! 📜
• Practice makes perfect, keep honing your skills! ✨
• Everything in IPv4 can be your playground with subnet mastery! 🕹️

Overview

In the thrilling conclusion to Practical Networking's subnetting series, video seven focuses on demystifying subnetting challenges in the first and second octets. Extending the knowledge from past videos, the cheat sheet now includes CIDR values down to /1, giving viewers the power to work with massive network spaces efficiently. Whether you're dealing with 10.50.1.11.2/12 or spanning the whole IPv4 scope, this final video is packed with practical insights and tips.

Starting with an example in the second octet, you’ll discover how to tackle subnetting problems with a /12 mask, calculating subnet values and increments like a pro. Using the cheat sheet is almost formulaic once you get the hang of it, enabling rapid and accurate subnet calculation that's essential for advanced networking tasks. Moving on to the first octet, the /7 mask problem demonstrates how identical techniques simplify even large-scale network calculations.

As the series wraps up, attention turns to a mind-blowing /2 problem that encompasses nearly 1 billion addresses, teaching viewers about the vastness of IPv4 addressing and the power of subnetting. It’s a celebration of mastering a skill that might seem daunting at first. However, with practice and the right tools, anyone can aspire to mastery, achieving quicker problem-solving times and confidently tackling even the most daunting subnetting challenges.

Chapters

• 00:00 - 00:30: Introduction and Overview In the 'Introduction and Overview' chapter of the IPV4 Subnetting Mastery video series, the video introduces viewers to video seven, focusing on solving subnetting problems in the first and second octet. The chapter promises to conclude the series by connecting the content back to the first video. It highlights the use of a subnetting cheat sheet employed throughout the series and notes the extension of CIDR values for more detailed octet breakdowns.
• 00:30 - 02:00: Subnetting in the Second Octet The chapter titled 'Subnetting in the Second Octet' begins by contrasting subnetting in the second octet with that of the first octet, specifically from /8 through /1. The chapter provides a practical subnetting problem example using an IP address of 10.50.1.11.22 with a CIDR of /12 in the second octet. It emphasizes that the subnetting methodology is almost the same across different octets, except that one needs to pay attention to which octet is being worked on. The chapter continues to explain the process starting with the provided CIDR value of /12, guiding readers on how to use a cheat sheet effectively for subnetting in different octets.
• 02:00 - 03:00: Subnetting in the First Octet The chapter titled 'Subnetting in the First Octet' focuses on subnetting within the second octet. The process involves using a worksheet to determine the subnet value of 240, appearing in the second octet of the IP address. With a group size of 16, the relevant column is incremented, beginning from 0. Since the subnet mask is /12, which falls in the second octet, calculations also continue in the second octet. This involves increments of 16 (e.g., 0, 16, 32, 48, 64), and the process identifies when the target value, such as 50, has been surpassed. Appropriate actions are then taken based on this observation.
• 03:00 - 05:00: Comprehensive Subnetting Problem The chapter discusses the methodology of solving subnetting problems, specifically focusing on the process of utilizing values for octets. It outlines how each octet's value is derived and discusses the steps for filling in essential attributes using a cheat sheet—particularly when calculating subnetting in the second octet. Additionally, the chapter addresses tackling subnetting issues in the first octet using an example IP address with a given subnet mask, highlighting the importance of starting the process in a consistent manner.
• 05:00 - 05:30: Closing Remarks and Encouragement to Practice In the final chapter, the focus is on solidifying understanding through a practical example involving subnetting. It explains the process of calculating subnet masks using a given prefix length. The example provided involves subnetting with a /7 prefix, and details the step-by-step method of determining the subnet mask by identifying the column and incrementing the group size in the octets. The chapter encourages readers to practice subnetting on their own to deepen their comprehension and offers reassurance that with practice, mastering the skill is achievable.

Subnetting in the /1 - /16 range - Subnetting Mastery - Part 7 of 7 Transcription

• 00:00 - 00:30 hey YouTube welcome to the ipv4 subnetting mastery video series welcome to video seven in this video we'll show you how to solve submitting problems in the first and second octet then we will wrap up the series by tying everything back together to what we discussed in the first video this is the subletting cheat sheet we've been using for the first six videos in the last video we extended the cheat sheet to include the site or values for the third octet to extend to the second and first octet we will simply continue the process we ended with / 17 so we will continue with / 16 through / 9 for the second octet
• 00:30 - 01:00 and / 8 through / 1 for the first octet our first example will be a submitting prom in the second octet we will solve all seven attributes for 10.50 1 11.2 - 2 / 12 if you watch the last video you'll understand the process to use this cheat sheet for any octet is nearly identical you just have to be mindful of which octet you are in as always we will start by using the provided cider value of / 12 to find our column in the cheat
• 01:00 - 01:30 sheet then we'll use the column to determine the subnet value which is 240 since the problem we are solving for is in the second octet 240 will appear in the second octet then we will use the group size of 16 to increment in the relevant column starting from dot 0 since a / 12 is in the second octet our mint will also be in the second octet so you'll have 0.16 top 32 48 . 64 and at this point we've passed our target value of 50 we can bring down the appropriate
• 01:30 - 02:00 values for the remaining octet he chalked out to the left of our increment is inherited from above and each octet to the right is 0 and from here the process to fill in the 7 attributes is the same as we've done many times before and that is how to use the same cheat sheet and steps to solve for submitting problems in the second octet next we'll do a subheading problem in the first octet we will solve all subheading attributes for 10.50 111 - t 2 / 7 the process starts the same / 7
• 02:00 - 02:30 gives us our column and the column gives us our subnet mask value of 254 since the / 7 is in the first octet this value will appear in the first octet every octet to the right will be 0 next we will use the group size of two to increment from zero in the first octet until we pass our target of ten giving us zero two four six eight ten twelve we can now fill in the remaining octets and at this point we've done the hard part and can simply fill in the appropriate attributes adding or
• 02:30 - 03:00 subtracting one as necessary just like that we've solved the subletting problem in the first octet in less than a minute okay we've reached the final prom this one will hopefully tie everything back together to what you learn back in video 1 we will solve all seven attributes for two 1351 11.2 to 2/2 as before The Cider of slash two gives us our column in the cheat sheet and the column gives us the subnet mask value of 192
• 03:00 - 03:30 which appears in the first octet since this is a slash two will then increment in sets of our group size of 64 in the first octet until we pass our target IP giving us zero 64 128 192 56 the weight 206 is not a valid value for an ipv4 address we also can't exactly increase the next octet because there is no octet before the first so let's talk about what is happening with this problem this
• 03:30 - 04:00 is every IP address in the ipv4 internet starting from 0 0 0 0 through 255 255 255 255 this is referred to as a / 0 network and includes all 4.2 billion addresses in ipv4 if we were to break up the entire Internet into two parts we would have to equal slash 1 and sub networks if we were to break up each of those into two parts we would have a total of 4 equal slash two networks when we were doing our increments of 64 we
• 04:00 - 04:30 were simply listing out the first IP address in each / 2 sub Network a specific IP address we were solving for exists in the fourth block we were successfully able to identify at the network ID which is the first IP in the block but you'll notice there is no slash to block after this is the last slash to in the Internet hence there is no next network attribute possible the last IP in the block serves as the broadcast IP address and the IP addresses after and before the
• 04:30 - 05:00 network ID and broadcasts are our first and last hosts to get the total number of IP addresses we would simply take 32 minus 2 which is 30 + 2 ^ 30 gives us approximately 1 billion addresses and that is the solution for yet another submitting problem if you've watched every video in the series and were able to keep up with the concepts you should be well on your way to becoming a subnetting master but mastery doesn't come without practice though so check out the end of video 4 for a link to a sub dating problem generator otherwise I hope you have found the content of the
• 05:00 - 05:30 subject mastery video series helpful if you've learned something please spread the word and share this video series with your friends so they too can enjoy sub bending in a way that is simple accurate and fast [Music]