Practice Examples - Subnetting Mastery - Part 4 of 7

[@PracticalNetworking]

All the videos in the series and the problem generator is available here: SubnetIPv4.com Want to learn the Fundamentals of Networking? www.practicalnetworking.net/index/networking-fundamentals-how-data-moves-through-the-internet/ Studying for the CCNA? Here are free resources to help you learn: www.practicalnetworking.net/index/ccna/ If you enjoyed this content, don't forget to show your support by liking, subscribing, and sharing this content amongst your peers. That would really help me out. Thank you!

[@CorgiiTube]

All of the HOURS I spent using Messer's "7 second subnetting" and all of the other 'guides' on how to subnet and THIS is exactly what I needed. I feel like a GOD - you are seriously amazing. THANK YOU!!!!!!!!!!!!!

[@PracticalNetworking]

Wohooo! Congrats on attaining Subnetting Mastery! Glad it all makes sense now =) You're very welcome, Priya!

[@SeraphSeph]

Yeah I feel like messers videos work for info dumping when you need to memorize facts, not so much for stuff like this where you actually have to learn a new function

[@AlexCruz-mv1gj]

I've tried to understand subnetting for at least 12 years and this method is really helping. Thank you!

[@PracticalNetworking]

Great to hear! If you have any questions, feel free to ask =)

[@olanrewajuadagba955]

It is unbelievable that your videos are still relevant in solving CCNA problems. You are the best Tutor I've ever met, thank you.

[@PracticalNetworking]

Thank you. So glad you're finding this content helpful. If you're interested in more, all my CCNA related content is here: www.practicalnetworking.net/index/ccna/

[@user-ih6oe9ny3j]

Nearly 2025 and it's still useful for the CCNA

[@genisis8951]

spent tremendous amount of time and watched quite plenty videos but never explained and elaborated at the same time made easy like you did Sir. Thank you

[@PracticalNetworking]

Thank you for the kind words =) I'm glad you found these videos helpful!

[@keitwilliamsmusic]

Dude, I found your video series through the r/CCNA subreddit. This is absolutely amazing and helped to tie together a subject I've been fighting with for a long time. Thank you for this!

[@PracticalNetworking]

Hi Moskeeto! So glad you've enjoyed the series and that its helped you learn subnetting!

[@abhishekshah11]

Hey good to see you on here from IG.!

[@richardluvhengo8195]

For the past two weeks, I've been struggling to understand. Through these videos, I finally hit a breakthrough. Thank you for taking the time to prepare and present this video.

[@PracticalNetworking]

Glad to hear it, Richard =). Congrats!

[@traceypeterson2328]

You're video teaching was the breakthrough I needed to wrap my head around and finally understand Subnetting! I am so grateful to you for taking the time to make these video teachings available for free! I don't have much money and I am changing careers into the IT field. This has always been a dream of mine and you are helping me to make it possible! No good deed goes undone! Thank you and God bless you, Sir!!

[@PracticalNetworking]

Hi Tracey. So glad this series helped you! If you liked these, you'll probably also like the rest of my CCNA content: www.practicalnetworking.net/index/ccna/

[@afaintmemory]

I did the practice problems and I was so happy! I'm learning, and I understand why my answers are my answers! Your subject matter goes from broad to specific and is organized in a very practical way! Thank you for helping us!

[@PracticalNetworking]

That's great news! So glad it's all clicking for you. Happy to help!

[@fabledfate]

The best video guide for subnetting by FAR. I struggled to get it on my own when studying for my Network+, but this video pushed me through everything. It all clicked! Thank you a ton!

[@hthmangum]

I have been struggling with this for 2 weeks now and this blew the doors wide open for me. I'll be knocking down these in class tomorrow morning and moving forward! Thank you!! This is Awesome. Everyone has told me to use Prof. Messer, this broke it down Barney style!

[@PracticalNetworking]

Glad this series helped =). Goodluck knocking these down in class tomorrow =). Remember, with great power, comes great responsibility.

[@mrgelin2159]

I can't thank you enough!!!! I feel free because you are explaining every side of the calculation of sunetting. You are greatly appreciated.

[@PracticalNetworking]

You're very welcome. So happy this is all helping with your Subnetting journey =)

[@martinotesta3983]

The lesson and chart are fantastic but the subnetting calculator is the bomb! This helped turn three days of frustration into an ahha moment. You know your stuff. Thank you.

[@PracticalNetworking]

Excellent, Martino! I'm so happy you had your "ahha" moment =).

[@ionutmatei7646]

Spent hours watching people from Udemy/KZbin trying to understand subnetting, just never clicked. I saw about these videos from somebody who posted on reddit. Practical Networking, you deserve a big 👍. This makes it so easy for me now to subnet. Can't believe that is so easy to grip once someone like you has managed to find the simplest explanation. Will recommend your series to anyone who is still struggling to understand subnetting. +1 Sub here

[@PracticalNetworking]

Thanks for your subscription =). Glad you found these videos and can now subnet. THanks for the kind words! PS: Out of curiosity, where did you see it linked on Reddit =) ?

[@performingspecs7841]

This is a great video series, I wasn’t able to catch on to this IPv4 subnetting through my CCNA 1 class and I don’t think my instructor has any ideas of how to explain it. Thank God for your videos because I wouldn’t have passed my class without it!

[@PracticalNetworking]

I'm glad you found these videos as well =). Feel free to pass them on to the other students in your class!

[@brianlockard1435]

You are a gentleman and a scholar, sir. Thank you so much for making these

[@randomness8455]

Great video. I finally understand it now. Great examples that make you think. I was ready to throw in the towel on subnetting and take my chances on the exam. You're a lifesaver.

[@eternalblue4660]

I never even knew about this cheat sheet, I feel cheated lol. This saves so much time though and makes me more confident now in my subnetting abilities. Thank you so much! I will recommend this playlist to anyone who asks how to subnet.

[@PracticalNetworking]

Thank you. Glad this gave you more confidence =).

[@genemae_179]

you are my angel my only angel you make me happy when skies are gray. Im crying of pain reading the Cisco document how to subnet i never had any experience with IT and im emotional that you saved me. Thank you so so so much for these videos i will definitely share to those who suffer :-)

[@PracticalNetworking]

This is the first song someone has sung to me on KZbin. Thank you! Glad you found these videos helpful. Thank you for your support in sharing the content.

[@redeyes392]

Best guide i've seen on the topic no doubt. Great teacher right here

[@PracticalNetworking]

Good news, everyone! The problem generator is now available at an easier link: SubnetIPv4.com.

[@Awdowdy]

Stumbled across your video on a Reddit thread link earlier today.This has helped me speed up my subnetting immensely! This will help me when I take my CCNA later this year. Thank you for this!

[@PracticalNetworking]

Glad it helped! You're welcome =)

[@BebehCookieIcecream]

I walked out of my networking college class very upset. Even with a very good GPA, subnetting just wasn't clicking for me. I had no idea what each value meant, why we incremented in certain ways, etc. This series is solving all my issues with the topic and I feel so much more ready to perform with each video in the series. My notes are also super organized as the video structure is also organized so well. Thanks so much!!!

[@Abiwrl]

Much respect from Puerto Rico. This video series is simply excellent. Thank you so much.

[@PracticalNetworking]

You're welcome! You might also like this one: kzbin.info/aero/PLIFyRwBY_4bRLmKfP1KnZA6rZbRHtxmXi

[@gdr1174]

Finally, an explanation that was straight to the point and clear 👍👍

[@TreasureSam-Ogolo]

Thank you for this series I am a noob in networking and other videos I came across were confusing, this showed clarity from the onset. Well done!!!

[@PracticalNetworking]

Thank you for the kind words, and you're very welcome =) Glad you enjoyed these !

[@thecommentor5519]

This concept was so confusing and I spent weeks to get over it on other sources. Found your videos yesterday and I am able to crack all the subnetting problems in < 60s! Thanks bro! Subscribed to your channel !

[@PracticalNetworking]

That's great, so happy to hear that! Thank you for your support!

[@3rawkz]

Bro... HANDS DOWN, best subnetting tut out on the web. Some tutorials are overly complicated methods, some try simplistic approach that I feel doesn't cover all the bases. This cheat sheet has helped me to get a grip on how to answer subnetting questions. My problem is that I'm taking my CompTIA Net+ tomorrow online and not allowed to use scraps of paper.... they want you to use a virtual whiteboard function PearsonVue exam application and is kind wack for writing things down but w.e, first thing Ill do is create my cheat sheet.... thank you so much!

[@PracticalNetworking]

Erick that's awesome! Glad to hear you're getting your head around Subnetting questions. Yes, most certification exams don't allow bringing notes. But they do provide a way for you to quickly jot down notes. That's the benefit of this cheat sheet is how easy it is to quickly jot down the three lines at the beginning of your exam.

[@Mr420ajay]

Thanks a lot for this video, for the past two to three weeks I had been watching several instructors video but some how was not able to grasp the idea fully and I was doubting my capabilities. Luckily while having coffee the other day I thought give one more try and am so glad I found your video on KZbin. Am so happy finally I cracked this and doing good in the problems generator. :-)

[@PracticalNetworking]

Ajay! That's awesome! I'm so happy it makes sense now! No need to doubt your capabilities anymore =) Join us for the live stream tomorrow and Saturday, we're going a step further with Subnetting: www.practicalnetworking.net/announcement/ip-aggregation-and-supernetting-upcoming-live-streams/

[@horsepower33]

i wish i found these videos before i sat my Network+. After so many months this is the only method I understand. Alot of people praise professor messer. But he makes me more confuse. Will be watching all your networking videos before i sit the cert again. Already subscribed. You deserved it

[@PracticalNetworking]

Thank you, Printassia. I'm glad you enjoyed this method and these videos. Good luck with your next certification exam! The Networking Fundamentals series will also probably be helpful for you: www.practicalnetworking.net/index/networking-fundamentals-how-data-moves-through-the-internet/ (although, at this time, the series is about halfway completed at this time).

[@horsepower33]

@@PracticalNetworking 🙂 the networking fundamentals playlist is what Ive been going through since last week, after completing the subnetting mastery playlist. I’m on the switches part 1 video. So we are both thinking the same.

[@pascaltube8434]

Hallo Ed, You as a teacher have following qualities. 1. you know how to teach (this is quite rare but still one might be lucky to find) 2. you know how to make people learn (almost impossible to find) 3. you know how to make people retain knowledge (this skill not there any more in this world)

[@PracticalNetworking]

Wow, thanks Preetam =) Such kind words! I appreciate you taking the time to comment and am so happy you have gotten a lot out of my content =)

[@rikardocorona7271]

Dude, incredible teaching how you explain so clear and understandable. You really help me a lot. Thanks for this.!!!

[@PracticalNetworking]

Glad it's helped you, Rikardo. =)

[@rikardocorona7271]

Hey bro. Could you help me with some examples of the VLSM with the third and second octects?

[@AlexDaniels74]

WOW, this is SO easy to understand now! I was racking my brain trying to figure out how to do this myself, but as with everything there is always an easier way.

[@PracticalNetworking]

I'm so glad you found these videos =). Glad it makes sense now.

[@ricardovisconti5681]

I´m astonished by your cheat sheet method. I´ve checked many methods out there, even the Cisco´s official course for the CCNA and this has been the best with difference!! I´m taking the exam next month, I think this series will make a huge difference :)

[@youjol11]

good work practice network. this video eliminate any sub netting confusion + reduce the calculation time half than before.

[@PracticalNetworking]

Fantastic. Congratulations!

[@MarlonT]

so glad i came across your playlist when trying to learn subnetting for the first time. I was able to do all the examples super easily, and based on the other comments, I feel like I saved myself a looot of headaches lmao. You made this super easy for me, thanks a lot!!

[@lucidspawn]

i can't thank you enough for this (haven't even finished all vids yet still 4/7) but it's helped me out so much. currently studying for my ccna. I owe you a beer man !

[@PracticalNetworking]

That's awesome. I'm glad it's all beginning to click =). If you're interested, we're going a step further with Subnetting in a live stream today and Saturday. Details here: www.practicalnetworking.net/announcement/ip-aggregation-and-supernetting-upcoming-live-streams/

[@karenfitzgerald1910]

Do more videos on CCNA please! You are the best instructor hands down!

[@PracticalNetworking]

Thank you for the kind words, Karen. I have more CCNA content posted here: pracnet.net/ccna

[@Duck_III]

Thank you for the clarification on when to increase when you run out of space within ipv4 addresses!!

[@kdominguez4089]

Awesome simple and easier than writing out several charts for my upcoming exam!

[@PracticalNetworking]

Glad it was helpful! =)

[@PracticalNetworking]

Did you use the problem generator? Did you solve all seven attributes? Reply to this comment with the IP address, Subnet Mask, and seven attributes you resolved.

[@svenstubes]

6 years later, it's still a helpful series.

[@aMacFanatic]

this vid with the practice link at the end made me feel like an expert. Well done

[@Recken1]

This simplifies subnetting so much. Oh, Man. Thank you.

[@PracticalNetworking]

You're very welcome. Please don't reck me =)

[@mad-xq6xy]

@@PracticalNetworking what about /24 and lower???????????????

[@meenaputra7210]

this is the most simplest way of explaining this, thank you very much. i just had to subscribe

[@PracticalNetworking]

Thank you for subscribing. Glad you enjoyed it =)

[@robjuke]

This is really great, but going from these examples to a /16 in the generator was mind blowing lol Thanks for making these vids!

[@PracticalNetworking]

Glad you liked them, Robert =). Hopefully Videos 6 and 7 in the series will make /16 (and anything /1 - /24) less mind blowing. =)

[@santran1240]

Thank you so much. I've been struggling to find a method to help me and your method is by far the best. It really help me in my study for the exam.

[@PracticalNetworking]

You're very welcome =)

[@rokeshkapali3743]

The best one I have come so far. Thank You!

[@PracticalNetworking]

Glad you enjoyed it !

[@mehmetnunoi2226]

Wow amazing, very detail and also best explanation with more cases. Thank You Sir, God bless you.

[@PracticalNetworking]

Glad you liked it! You're very welcome.

[@jeffersonsanchez5972]

I’ve tried to use your tool for exercises but the first problem was a /20 and I got lost cause didn’t know how to use you CC. Btw you are doing a great job and it’s really easy to understand. Thank you

[@t.manojkumar]

Very greatly explained, one-stop solution for all the subnetting calculations

[@jontejas7188]

thank you and everyone that encourages and makes learning possible.

[@PracticalNetworking]

You're welcome, Jon =)

[@infotechyeti]

the practice subnetting is priceless. thank you!

[@PracticalNetworking]

Hi again Jonathan, glad you enjoyed them! =)

[@Partyys]

great that you've decided to create a website for this !because without it i wouldnt never land here, thaaaaanks maan youre amaziing

[@ebogdan1037]

Currently prepping for the ccna ..... your a life saviour 👍👏👏

[@PracticalNetworking]

Glad to help =). Don't forget to check out the rest of my CCNA content: www.practicalnetworking.net/index/ccna/

[@techiessj]

Learned this method. In 1 hour. Practicing and learning the cheat sheet. Thank you. Please make more videos or send classes so I can subscribe like udemy

[@91thewatcher23]

good last two problems!!! Glad you included those.

[@PracticalNetworking]

;) Yup. Those can be tricky, wanted to provide examples before turning students lose to practice on their own.

[@Zoloist]

Best video for subnetting by far.

[@skybyte4me]

You're explanation is better than my CISCO teacher in college

[@PracticalNetworking]

Glad you enjoyed it =)

[@dahamsoysa]

Awesome, Thank you so much for this video series. That explanation was very clear and perfect. 😍😍🥰🥰

[@jakeem8681]

Brother thank you so much. You make things so clear. I’m forever grateful. Keep up the great work. Let us know if there’s anything we can do other than subscribing and liking your videos.

[@PracticalNetworking]

Spreading the word would be the other thing =) There are too many people out there still struggling with Subnetting. I'd love for them all to learn just as you have =). Thanks Jakeem!

[@papaakumaning3502]

I almost gave up bro!... like for real for real you saved me

[@PracticalNetworking]

Glad you didn't give up =).

[@catlover1157]

Spot on. Gold Mine! Thank you Sir. I wasted a lot of time with the other resources. I wish i found this sooner

[@PracticalNetworking]

Your'e welcome! Glad you enjoyed it.

[@talalakbarlaghari]

Easy as ! excellent resource Heads off to you mate !

[@PracticalNetworking]

Thank you, Tee. Glad you enjoyed the series =)

[@Ud-bg02]

Wow best ever explanation... Bless u!! 🥰

[@PracticalNetworking]

Cheers!

[@m.c.rodriguez28]

Thank you for your videos. Great work.

[@PracticalNetworking]

You're welcome!

[@iiN1GH7M4R3ii]

thank you thank you!!!! you deserve awards

[@PracticalNetworking]

[@fafa_belle]

You are the best..I finally understand this.

[@PracticalNetworking]

In that case, I'm so glad you found these videos =). Don't forget to practice at SubnetIPv4.com !

[@simpleHass]

Can confirm after several videos, this was the easiest for me to understand. I' am also currently in a CISCO course and found this video easier to understand than the QA teacher :D My company is paying for the course but 2.5k is joke when I can get the info in videos lol

[@arturz8192]

That's an amazing content! I watched Professor Messer, Mike Myers, Sunny network academy, some other resources, they were all understandable, but confusing. Your vuseo is clear and concise, finally helped me to put all bolts and nuts together! Subscription and Like from me :)

[@PracticalNetworking]

Artur! That's awesome, I'm so glad it finally sunk in. Thanks for the kind words, and the like/subscribe. I appreciate it!

[@lahirupriyankara2183]

@@PracticalNetworking LOL! thanks man i also follow above mentioned videos and didn't understood anything thanks to this video series now i have the confidence to subnet

[@PracticalNetworking]

@@lahirupriyankara2183 That's great, Lahiru! I'm so glad you found this set of videos helpful =)

[@Appoxo]

@@PracticalNetworking Can confirm...Currently in training for a job and the school side did explain the concept I somehow could use it in docker but never really solve it that fast. I solved all 4 problems probably within 5 or 6min. My personal problem was to calculated the subnet of the before and after and the BC-adress. You just made my evening with these steps

[@willberforce876]

yes this makes it way more simpler compared to everything else ive seen.....even the famous professor messer didnt explain is as good. i was still confused after watching his.

[@Mellowcanuck33]

Thank you brudda. You sorted my gray matter right out. Cheers.

[@NityadeepikaSiddamsetty]

at 8:15 , why should we go from 10.2.2.192 to 10.2.3.0 ? It is /26, that means, 26 bits are ON. that also means 26 bits are fixed network and cannot be modified. Am I right? please correct me.

[@adamjameel7108]

Finally now I'm an official sub-netter, thank you very much.

[@PracticalNetworking]

Congrats Adam! Happy for you!

[@abakarabrar]

Absolute quality. Thanks a bunch!!

[@PracticalNetworking]

You're welcome!

[@toniatfort56]

thanksss... This is magical; very helpful!

[@SnowDaemon]

This is a God-send. Thank you

[@PLazz257]

I blame myself for not finding this channel sooner!

[@PracticalNetworking]

Glad you found it now =)

[@ihsanmohammed3593]

Excellent! Thank you so much. I found the cheat sheet very helpful :-)

[@PracticalNetworking]

You're welcome =)

[@ZoeBredan]

Thank you , i enjoyed watching your videos.

[@PracticalNetworking]

Those are covered in part 6 of the series. =) There are links in the description.

[@saedaden9722]

thank you for ur clear illustration. how do i know when i have to increase the size until i pass the target..

[@PracticalNetworking]

You're welcome. You will increase the size until you pass the target for every problem.

[@barunkumar9429]

Thank you for providing this easy solution

[@josem9408]

Correct me if I'm wrong because I'm new to subnetting and you have much more experience than me, but I think when it comes to determining the number of subnets and hosts, I think this chart may be flawed. Maybe I'm overthinking it, but here's my thought process: the number of subnets = 2^x, where x = the number of host bits turned on (the number of ones) the number of hosts = 2^x - 2, where x = the number of host bits turned off (the number of zeros) The example at 3:53 is a class A IP Address, which means the first octet is for the network, and the last 3 octets are for the hosts. So the number of host bits in total are 24. Of those 24 host bits, 17 host bits are turned on (they are 1s), so 2^17 = 131,072 subnets. (I'm assuming your "# of IP addresses" is the number of subnets). That means 7 of those host bits are turned off (they are 0s), so 2^7 - 2 = 126 hosts (usable addresses). So I guess the hosts (usable addresses) part is fine, but I'm concerned about the part about the subnets. Don't get me wrong, bless you for making this cheat sheet because it's so simple to understand and I love it, but I don't know if I just confused myself more about how to figure out the subnets. Could you please clear this up for me?

[@PracticalNetworking]

Hi Jose. You're referring to networks and subnets from a "Classful" perspectives ... but Class A/B/C networks have been deprecated for nearly 30 years. I wrote about Classful vs CIDR in this article, I think it will help you understand: www.practicalnetworking.net/stand-alone/classful-cidr-flsm-vlsm/ Either way, regarding the 2^x you mentioned, that is absolutely correct and a strategy I talk through in video 8 and 9 of this series.

[@josem9408]

@@PracticalNetworking Thank you so much!

[@naveenkumar-cr2eg]

This is Just Amazing. Please upload video for Network fundamentals like TCP

[@lydiagiwa2178]

I cant believe i could learn this. Thanks a mil

[@PracticalNetworking]

You're welcome, Lydia. I'm happy you've learned to Subnet from these videos =)

[@mr.l3785]

Thank you for creating this!

[@ronaldbocaly5054]

Hi. I feel like you could have precised that so far, we're only able to solve ip subnets from /25 to /32. If I were to go on the website rn for more practice, I wouldn't be able to solve a subnet with /20 for example. That's a little confusing but great job still.

[@PracticalNetworking]

This is part 4 of 7 in a series or videos. Video 1-5 will teach you to master Subnetting /25-/32, and videos 6&7 will teach you /1-/24. =)

[@sbcns]

Bruh, I agree. Lol, I feel like I'm getting vertigo once I start solving /20 and below it. I'm glad OP has a video for that. Thank you!

[@GaryKlimeck]

Thank you, very clear and helpful.

[@PracticalNetworking]

You are welcome, Gary!

[@maxmoanz6561]

Dude, I feel like I have received forbidden knowledge.

[@walidg7810]

Bro, your teaching is just amazing. Thank you so much. Want to know what and why is /24 and so on. Or do u have other video about this.

[@jonpinkley2844]

Are you going to cover the special case of /31? rfc3021 - Using 31-Bit Prefixes on IPv4 Point-to-Point Links. Also the use of /32 for things like loopback interfaces.

[@PracticalNetworking]

Hi John. I cover /30 and /31 networks for point to point links in the VLSM video here: kzbin.info/www/bejne/l56uqpmYnJp6aLM I don't cover loopback interfaces in this series.

[@dangoos]

Thank you very much for the videos. I however want to find out why the Subnet mask is always 255.255.255.......... thus the default subnet mask of type C IPs.. Thank you

[@PracticalNetworking]

That's just the most common. It was commonly held in the past that a Subnet couldn't sustain 200~ hosts. Modern computers/routers/switches can handle significantly more, but 200 became the unofficial target and 255.255.255.0 allows for 250~ hosts maximum, so it fit well.

[@solomonezeugo-ugonu8887]

Thanks bro, It was really helpful!

[@paritoshk990]

Such an amazing series! Just loved it! You are a really really cool teacher! Also, can we also have one video on supernetting, please? :D

[@PracticalNetworking]

Thank you, Paritosh. I am weighing up making a "VLSM on paper" and "Aggregation / Supernetting" appendix video to add to this series. Do you think those would be useful for students?

[@paritoshk990]

@@PracticalNetworking Yes, it will be much helpful for students! Supernetting and subnetting go hand-in-hand in the university curriculum. WRT VLSM, it is sort of a pre-requisite/assumed knowledge when we study network design, making it really important. Also, isn't VLSM just so interesting? :D

[@facundocolino5017]

Great method, what happens for CIDR less than /24?

[@DarkSw0rD]

5:46 Why is the grp size (4) is the number of ip adresses and not 4-2= 2 usable ip adresses ?

[@PracticalNetworking]

Group Size is the Total number of addresses. You'll always have to do -2 to get usable. This is explained in these videos: kzbin.info/www/bejne/eIi9XoB-fs2koK8 kzbin.info/www/bejne/a17anZl3mcigfLM

[@DarkSw0rD]

@@PracticalNetworking Alright thank u! Awesome videos btw!!

[@PracticalNetworking]

@@DarkSw0rD You're welcome. Glad you enjoyed them =). If you're willing to help me out, mentioning this video series on twitter/linked in/reddit/etc would be greatly appreciated =).

[@mallekhn]

your video is amazing thanks simple explanation

[@ahmedsifaw247]

Thank you sir, this is really helpful

[@nicholas1895]

Isn't that cheat sheet only for class C networks, though? If the address is 10.2.2.88 /27 , like in the first example, how would we know that only 3 bits are borrowed from the last octet, as opposed to 3 from the last octet and 8 from the previous octet (making a total of 12 bits borrowed, thus many , many more subnets)? thanks!

[@PracticalNetworking]

The cheat sheet can be extended to handle all octets. Videos 6 and 7 will show you how. As for borrowing bits... the problem/question ought to include the starting point, for the very reason you mentioned: /27 could be borrowing 3 bits from a /24, or 11 bits from a /16. If the problem/question doesn't explicitly state a starting point, then typically the problem expects you to infer it from the IP addresses' Class -- Class A / Class B / Class C. The issue is IP Address classes have been legacy for nearly 30 years: www.practicalnetworking.net/stand-alone/classful-cidr-flsm-vlsm/

[@nicholas1895]

@@PracticalNetworking thansk for pointing me to those videos and thanks for an excellent series!

[@SEAhawkstwelfthman]

I am attempting to navigate to the subnetting practice page referenced in the video, but I'm receiving a 404 error stating that it isn't there anymore? Please let me know if there is any recourse available. Thank you very much for this whole subnetting series, and I will be viewing your other material as well. Short, to the point, concise, and the concepts are very clearly explained and demonstrated. You earned a sub for this one. Currently I'm studying for my CCNA. I'm on ICND1 practice, and this subnetting series is great! I especially enjoy your cheat sheet. Very helpful!

[@PracticalNetworking]

Hi there. Glad you enjoy the videos and articles! Thanks for the Subscribe ;) The practice page is working for me... here is the full link, try that: www.practicalnetworking.net/subnet.html Also, if you're interested in a concise list of every article I've written that overlaps with ICND/CCNA curriculum, check out this link -- I just put the list together for Reddit: www.reddit.com/r/ccna/comments/8zmafo/studying_for_the_ccna_youll_want_to_read_these/

[@SEAhawkstwelfthman]

Oh wow, I was only typing www.practicalnetworking.net/subnet. My apologies, it is working properly! Heads up for anyone doing the same thing I suppose! I appreciate the prompt response. Thanks again!

[@PracticalNetworking]

Ah, yea, that makes sense. The "shortcut" URL is "pracnet.net/subnet", which automatically redirects you to www.practicalnetworking.net/subnet. Good luck with the studies!

[@Banananananananananananannnn]

Why is the total number of IP addresses in this video the same as the group size, but in the other videos it is 2^(32-CIDR)?

[@infomoreandmore]

Very awesome and helpful video

[@PracticalNetworking]

Thank you =)

[@infomoreandmore]

@@PracticalNetworking can you please make a video on STP please!