This is the second Subnetting playlist I went through and will NOT need a third one. Explanations are very well structured and I feel now confident to answer any type of questions including FLSM and VLSM. Did some extra practices and after 15 minutes the results (answers) were flawless. These are the 3 keys of the playlist to master Subnetting: A. Cheat Sheet including the four octets / B. The 4 speed tips / C. The 2 to the power of x table for VLSM efficient tailor-made subnets sizes. 11 out of 10 for Practical Networking!!!! :)
Ed you get enough compliments on every video you publish but I couldn't resist saying how much they help us learn or refresh these concepts. Your visualizations are on next level and I know it takes a lot of work and dedication. Thank you!
I don't think it's possible to do a better job teaching subnetting. So clear, concise, quick and thorough. Great job. I can't wait to watch more of your videos.
Bro Im on CCNA right now and you have absolutely no idea how helpful you have been your videos are literally what allowed me to pass Network + and I’m rewatching for CCNA but taking it further with your VLSM videos thanks man I’m sure you have heard this a lot but I truly think you should make a full CCNA course and chargefor it the way you explain just clicks and makes things not so intimidating
Thank you for the kind words =). Glad you found this content helpful and it's helping/helped you with the Net+ and CCNA. Yes, I get "full CCNA" requested very often. I'm still weighing up whether that will work as beneficial time investment tradeoff. If I could find a way to make RUclips pay full time salary, it would be an easy choice =/
Thank you so much for putting up these videos, was really having trouble with my subnetting until you broke it down and went over it step by step in an easy to understand methodology, now to memorize this for my CCNA 200-301 :) Thanks again!
Dude, just thank you. So much. I was lucky enough to stumble across one of your comments on reddit, and I'm so glad I did. I've watched Prof. Messer's, Mike Meyers', and Jason Dion's videos on subnetting and, although I love all of their content for my studying, none of them laid out subnetting in such a clear and easy to understand way. Thanks again!
Hey Josh. So glad these have helped =). You're very welcome =) I'm sure you know other class mates or peers or communities you've connected with studying for Net+/Sec+/etc. If so, maybe they would also benefit from seeing these videos as well? Any sharing you can do is greatly appreciated!
This series has been great. I finally understand subnetting. I have been very confused using several different resources. Your explanations and cheat sheet have been the best. Thank you!!
That's great news, James. I'm so glad it's all clicked for you! If you're willing, I'm sure you have coworkers or classmates that would also benefit from watching this series. Sharing the links would be greatly appreciated.
*_BONUS Question_* : *At **07:48** I allocated **9.9.9.224/28** to the segment that required 12 hosts. I could have allocated **9.9.9.48.**.. Why, from a network design standpoint, was my choice to use **9.9.9.224/28** more optimal?*
@@RyandeMedeiros Hi Ryan! Glad you've enjoyed the series! To answer your 2nd question, 9.9.9.48/26 is not a valid Network ID, there are only 4 /26's in 9.9.9.0, and they start with .0, .64, .128, and .192. If that's unclear, check out Video 3, and solve for the Network ID of 9.9.9.48/64, you'll see what I mean. (or plug it in at SubnetIPv4.com ) And as for your first question, I don't want to give away the answer just yet. But, I'll give you a hint. At some point, R1 is going to have to learn of the specific networks connected to R2 and R3. How does my strategy make it easier to tell R1 about the subnets to the right? =)
@@ytfamily000 I suppose it wasn't. So, thanks for the reminder. And... here it is: The reason I chose 9.9.9.224/28 was to make so all the networks behind R3 fit inside the same "/25" block -- 9.9.9.128/25. This then makes it so all the networks behind R2 fit in the other /25 -- 9.9.9.0/25. This will make the routing on R1 much simpler, as we would just have to tell R1 that 9.9.9.128/25 is behind R3, and 9.9.9.0/25 is behind R2. The /30 and /31's we use for the Point to Point link are all directly connected to R1, so we won't have to account for an additional static route for them.
@@PracticalNetworking Say, I was establishing OSPF in these routers, then a single command would've established routes instead of defining each networks differently if done as per your answer: router ospf 1 network 9.9.9.0 0.0.0.127 area 0 network 9.9.9.128 0.0.0.127 area 0 Am I right?
@@jeevansapkota6647 Oddly enough, I'm going to be working on a video that discusses the Network command and how it works shortly. But to answer your question, You could apply the 9.9.9.0/25 line on R2 and the 9.9.9.128/25 line to R3 and R1 would receive all the necessary updates (about all six networks) If the /28 we assigned to R3 was 9.9.9.48/28, then R3 would need both network statements to advertise all of it's networks to R1. Either way, remember the Network statement only enables OSPF on interfaces (and therefore, the advertisement of those interface's networks). What actually gets advertised is the interface network itself, not the masks in the Network statement. (If that didn't make sense, stay tuned, it will all make sense when I release that video)
Thank you... and... I agree =) With that goal in mind... Could you do me a favor? Do you mind sharing this video on Linked In, Reddit, Facebook, or any other social media you use? As an independent creator, that would be an _enormous_ help, and I would appreciate it _greatly_ . =)
As you said we can use /31 for point to point network, where we don't need broad cast address but what about network address in /31, for network address there also need an IP address so we must have 3 IP addresses in which case again /30 comes. Can you clarify me about this doubt?
I'm having one problem. How do you use the cheat sheet if the host size is over 600? I tried to use the 2 to the power of n table, but it only went up to 9. Also, the cheat sheet doesn't have a group size larger than 128. Kinda confused.
At 8:15 when you say each router interface gets 2 IP addresses, what does it mean? How is it different than any other device (say my PC) getting a single IP address?
2 IP addresses for the _link_ - one on either side (i.e., one on reach Router interface). As for your 2nd question (difference between Host and Router), see here: ruclips.net/video/AzXys5kxpAM/видео.html (start at ~2:09 or so)
My next question is about the 2:39 timestamp. How exactly did you arrive at that calculation? I initially thought you were going by 32, but that would've made it so you listed each block in the /27 column. Did I miss something?
That's similar to one of the questions in Part 1 of the appendix discussing FLSM. If the question doesn't provide a mask, they probably mean for you to infer the mask from the IP address class. Details here: www.practicalnetworking.net/stand-alone/classful-cidr-flsm-vlsm/ Note that Classful addressing has been discontinued for nearly 30 years. That is why I intentionally made no mention of it in the series.
9.9.9.0/27 includes 9.9.9.0 through 9.9.9.31 (which is a total of 32 IP addresses). The next available IP would be 9.9.9.32, which is where the next block (of /28) will start. Let me know if that makes more sense.
The Network ID being unusable was sort of a relic of ancient networking. There is nothing about the "first IP address" that makes it unavailable for use... it was sort of arbitrarily decided that way back in the 70s and 80s when the "IP" protocol was being written. Case in point... IPv6 totally allows the use of the first IP address (what would be the "Network ID" -- but IPv6 doesn't have a Network ID).
10:04 I was confused for a bit cuz you only said "you don't need a Broadcast IP", but then I guess we also don't need a Network ID, since there are only two devices in this subnet. Though this type of subnet can only be identified using its two IP addresses and its subnet mask according to GPT-4, however that's done... Great playlist though, long road ahead but trying to power through it!
@@HinSela It takes me a while to put together videos at this level of quality. I'm getting better at it, and at completing them faster. But I also can't work on videos 24/7 =/
Great video ! I do have one question though. If the requirement host IP address is something like 1000, then we would have to reach sub /24 CIDR. Do you have a guide on VLSM with a large address requirements?
So glad you asked =). There's a video about how to solve these using only scratch paper and no visualization: ruclips.net/video/2i_2za40vZg/видео.html =)
I cannot tell you how valuable your Subnetting series was to me!! Quick question: On VLSM networks, with one subnet needing 16,000 hosts, the next needing 8,000, and down the line, if I am given a CIDR of /16 to start with , does the cheat sheet still work? i.e. keep adding CIDR's like it did in vid 6/7?
So glad you enjoyed it =). Unfortunately, no, ithe cheat sheet wouldn't help you there. The Group Size represents the # of IPs, but only for /25 - /32. Once you go bigger than that, I would recommend 2^N strategy to calculate number of IPs. For example: In a /24, there are 24 bits in the Network portion, which means 8 bits are remaining, and 2^8 = 256. In a /20, there are 20 bits in the Network portion, which means 12 bits are remaining, and 2^12 = 4096. Hopefully if you're being asked to carve out blocks of 8000 and 16000 IP addresses your instructor is letting you use a calculator =)
You have a great teaching style - You've just got a new subscriber! Do you know whether these types of questions will come up on the CompTIA Network+ exam? The Exam objectives does say VLSM (given a scenario, configure the appropriate IP addressing components)
Thank you for your videos. They are all truly incredible. At 9:43, the point to points are 9.9.9.48/30 and 9.9.9.52/30. If we applied the same method from the second portion to the first portion, will the following information be correct: 50 = 9.9.9.0/26 25 = 9.9.9.64/27 10 = 9.9.9.96/28 Point to point 1 = 9.9.9.100/30 Also, would it be incorrect if: Point to point 2 = 9.9.9.228/30 ? Thank you.
You're welcome =) You're very close! 9.9.9.96/28 includes 16 IP addresses (.96 - .111). So 9.9.9.100/30 wouldn't be a usable /30. The next /30 would be 9.9.9.112/30. Otherwise the rest looked good. You're also slightly off on your 2nd Point to Point. Instead of giving you the answer, why not give it another go? Consider what you may have learned from the correction above.
Address Classes are no longer relevant. They are an artifact of history. More details here: www.practicalnetworking.net/stand-alone/classful-cidr-flsm-vlsm/
Great question. This is exactly why being able to solve the "next network" value described in Videos 1-7 is important. If you organize the networks you need to solve for from biggest to smallest, the "next network" will always be the start of where the next block you have to assign begins. Honestly I should make a video about this... what do you think?
I imagine you are referring to the visualization of the network space broken up in twos over and over again? That is simply something to show you visually how to solve VLSM problems. Once you've worked through a few practice problems, you'll start to no longer need it and can simply do it 'by hand'.
Thank you for the great videos! Great quality and informational. I have watched them all and sub'd. I have a special request if possible: show subnetting/vlsm for larger groups? Example something like you have ip 172.20.9.0/22, need to break into different subnets for users in each group; 450, 300, 150, 50. How do I subnet the large groups? How is it addressed between 172.20.9-10... since there's only 255 hosts in ...9.0, right? I hope this is understandable enough :S thanks all the same!
You'll want to start with becoming comfortable solving for number of IP addresses in the /24 through /17 range. You can watch video 6 and 7 for instructions on that. Once you've done that, the process is the same as it was in this video: Start with the biggest network, assign the appropriate size network and subnet, then solve for the Next Network ID of the block you just assigned -- the next subnet you assign will start with that IP address (regardless of it's size). Hope that is enough to get you started. Best of luck!
I'm a tad retarded so maybe someone could peer review what I did and tell me if it's viable? (/26 for 50 hosts) 9.9.9.0 - 63 *(First number is Net, last is Broadcast) (/28 for 31 hosts) 9.9.9.64 - 127 (/27 for 25 hosts) 9.9.9.128 - 159 (/27 for 19 hosts) 9.9.9.160 - 191 (/28 for 12 hosts) 9.9.9.192 - 207 (/28 for 10 hosts) 9.9.9.208 - 223 Routers. Once I got to this point I wished I assigned them lower numbers (/31 for 2 hosts) 9.9.9.224 - 225 (/31for 2 hosts) 9.9.9.226 - 227
For this one: (/28 for 31 hosts) 9.9.9.64 - 127 Did you mean /26? The rest of the math is done as if it were a 26. Otherwise, yes. That is viable solution for the problem set in the video.
@@PracticalNetworking Hi Really good video. I really like how you incorporated the real world aspect for VLSM. One thing I was looking for was an example that uses the 3rd octet in VLSM. Consideration for an example such as a college campus student wi-fi or similar. You know for cases when you have to consider a subnet size of 1200 IPs or so where a CIDR of /21 would have to be used.
The process is the same. You're just using bigger networks and subnetworks. Video 6 in the series will teach you about working with subnets in the 3rd octet, and specifically, how to determine the number of IP addresses. That would tell you the network sizes you need to "carve out", and then the process is the same as the beginning of the video where we kept cutting things in half, or the part of the video where we broke the /28 into /30's and /31 networks.
This is the second Subnetting playlist I went through and will NOT need a third one. Explanations are very well structured and I feel now confident to answer any type of questions including FLSM and VLSM. Did some extra practices and after 15 minutes the results (answers) were flawless. These are the 3 keys of the playlist to master Subnetting: A. Cheat Sheet including the four octets / B. The 4 speed tips / C. The 2 to the power of x table for VLSM efficient tailor-made subnets sizes. 11 out of 10 for Practical Networking!!!! :)
Whoa! Thanks for the kind words, Stefano =). I'm so happy you feel comfortable with Subnetting now!
As someone who conceptualizes math visually with colors and blocks this video is incredibly helpful. THANK YOU!!!
So glad you enjoyed it. You're very welcome!
Ed you get enough compliments on every video you publish but I couldn't resist saying how much they help us learn or refresh these concepts. Your visualizations are on next level and I know it takes a lot of work and dedication. Thank you!
It's still appreciated =) Thank you for the kind words, Enes. =)
I don't think it's possible to do a better job teaching subnetting. So clear, concise, quick and thorough.
Great job. I can't wait to watch more of your videos.
Bro Im on CCNA right now and you have absolutely no idea how helpful you have been your videos are literally what allowed me to pass Network + and I’m rewatching for CCNA but taking it further with your VLSM videos thanks man I’m sure you have heard this a lot but I truly think you should make a full CCNA course and chargefor it the way you explain just clicks and makes things not so intimidating
Thank you for the kind words =). Glad you found this content helpful and it's helping/helped you with the Net+ and CCNA.
Yes, I get "full CCNA" requested very often. I'm still weighing up whether that will work as beneficial time investment tradeoff. If I could find a way to make RUclips pay full time salary, it would be an easy choice =/
If there are Oscars for subnetting videos, this series worth it without second though!!! Excellent presentation in any aspect.
Love it ;).. That would be awesome, heh.
One of the best comprehensible subnetting videos I have come across - Thank you very much!
Glad you enjoyed it, Vikram =). Thank you for the kind words.
Thank you so much for putting up these videos, was really having trouble with my subnetting until you broke it down and went over it step by step in an easy to understand methodology, now to memorize this for my CCNA 200-301 :) Thanks again!
Glad I could help! Good luck with your exam! By the way, more free CCNA resources are available here: www.practicalnetworking.net/index/ccna/
Dude, just thank you. So much. I was lucky enough to stumble across one of your comments on reddit, and I'm so glad I did. I've watched Prof. Messer's, Mike Meyers', and Jason Dion's videos on subnetting and, although I love all of their content for my studying, none of them laid out subnetting in such a clear and easy to understand way. Thanks again!
Hey Josh. So glad these have helped =). You're very welcome =)
I'm sure you know other class mates or peers or communities you've connected with studying for Net+/Sec+/etc. If so, maybe they would also benefit from seeing these videos as well? Any sharing you can do is greatly appreciated!
This is the best video I found on RUclips to learn easiest way..superb
=)
This series has been great. I finally understand subnetting. I have been very confused using several different resources. Your explanations and cheat sheet have been the best. Thank you!!
That's great news, James. I'm so glad it's all clicked for you!
If you're willing, I'm sure you have coworkers or classmates that would also benefit from watching this series. Sharing the links would be greatly appreciated.
For a visual orientated learner this video was a boon. Thank you.
Thank you, Pascal. Glad you enjoyed this one too =)
*_BONUS Question_* : *At **07:48** I allocated **9.9.9.224/28** to the segment that required 12 hosts. I could have allocated **9.9.9.48.**.. Why, from a network design standpoint, was my choice to use **9.9.9.224/28** more optimal?*
@@RyandeMedeiros Hi Ryan! Glad you've enjoyed the series!
To answer your 2nd question, 9.9.9.48/26 is not a valid Network ID, there are only 4 /26's in 9.9.9.0, and they start with .0, .64, .128, and .192. If that's unclear, check out Video 3, and solve for the Network ID of 9.9.9.48/64, you'll see what I mean. (or plug it in at SubnetIPv4.com )
And as for your first question, I don't want to give away the answer just yet. But, I'll give you a hint. At some point, R1 is going to have to learn of the specific networks connected to R2 and R3. How does my strategy make it easier to tell R1 about the subnets to the right? =)
Was this bonus question answered anywhere?
@@ytfamily000 I suppose it wasn't. So, thanks for the reminder. And... here it is:
The reason I chose 9.9.9.224/28 was to make so all the networks behind R3 fit inside the same "/25" block -- 9.9.9.128/25. This then makes it so all the networks behind R2 fit in the other /25 -- 9.9.9.0/25.
This will make the routing on R1 much simpler, as we would just have to tell R1 that 9.9.9.128/25 is behind R3, and 9.9.9.0/25 is behind R2.
The /30 and /31's we use for the Point to Point link are all directly connected to R1, so we won't have to account for an additional static route for them.
@@PracticalNetworking Say, I was establishing OSPF in these routers, then a single command would've established routes instead of defining each networks differently if done as per your answer:
router ospf 1
network 9.9.9.0 0.0.0.127 area 0
network 9.9.9.128 0.0.0.127 area 0
Am I right?
@@jeevansapkota6647 Oddly enough, I'm going to be working on a video that discusses the Network command and how it works shortly.
But to answer your question, You could apply the 9.9.9.0/25 line on R2 and the 9.9.9.128/25 line to R3 and R1 would receive all the necessary updates (about all six networks)
If the /28 we assigned to R3 was 9.9.9.48/28, then R3 would need both network statements to advertise all of it's networks to R1.
Either way, remember the Network statement only enables OSPF on interfaces (and therefore, the advertisement of those interface's networks). What actually gets advertised is the interface network itself, not the masks in the Network statement. (If that didn't make sense, stay tuned, it will all make sense when I release that video)
Great Videos. Should be used in every IT Networking classroom!
Thank you... and... I agree =)
With that goal in mind... Could you do me a favor? Do you mind sharing this video on Linked In, Reddit, Facebook, or any other social media you use? As an independent creator, that would be an _enormous_ help, and I would appreciate it _greatly_ . =)
@@PracticalNetworking Will do
@@bobdemp8691 Much appreciated, Bob. Thank you.
This is kind of explanation I want to hear! Thank you very much!
So glad it helped =) You're very welcome!
Wow. I'm blown away. Thank you so much for making these videos 😇
You're welcome =)
Excellent video - the visualization is top-notch to get the idea across.
SO glad you liked it! Thanks for the kind words =)
Bro, you need more recognition. What a content!
You should do more of these videos. Thank you very much!
You're welcome. Working on another video as we speak ;)
Great explanation,may god bless you guys
Glad you liked it =)
This is how simple I need things to be great job!
You are a master at teaching. Thank you.
Thank you for the kind words. =)
As you said we can use /31 for point to point network, where we don't need broad cast address but what about network address in /31, for network address there also need an IP address so we must have 3 IP addresses in which case again /30 comes. Can you clarify me about this doubt?
Ed, you are just the best. God bless you.
I'm having one problem. How do you use the cheat sheet if the host size is over 600? I tried to use the 2 to the power of n table, but it only went up to 9. Also, the cheat sheet doesn't have a group size larger than 128. Kinda confused.
At 8:15 when you say each router interface gets 2 IP addresses, what does it mean? How is it different than any other device (say my PC) getting a single IP address?
2 IP addresses for the _link_ - one on either side (i.e., one on reach Router interface).
As for your 2nd question (difference between Host and Router), see here: ruclips.net/video/AzXys5kxpAM/видео.html (start at ~2:09 or so)
@@PracticalNetworking Thanks, you're awesome.
@@SinghBivek
that was an awesome explanation of VSLM.
Glad you liked it!
Great videos. Watched them all. Thank you so much.
Glad you enjoyed them, Charles =)
This saved my grades thankyou so muuchh❤
My next question is about the 2:39 timestamp. How exactly did you arrive at that calculation? I initially thought you were going by 32, but that would've made it so you listed each block in the /27 column. Did I miss something?
Never mind, you're not listing them in a particular order. My bad!
You are correct. I'm listing the /27 increments to identify the Network IDs for each /27 in 9.9.9.0/24, which indeed is going in increments of 32.
This was clear and informative!! Amazing!
Glad you enjoyed it!
I encountered some practice questions online that asks for number of subnets and hosts, given only an IP Address and no CIDR. How to deal with that?
That's similar to one of the questions in Part 1 of the appendix discussing FLSM. If the question doesn't provide a mask, they probably mean for you to infer the mask from the IP address class. Details here:
www.practicalnetworking.net/stand-alone/classful-cidr-flsm-vlsm/
Note that Classful addressing has been discontinued for nearly 30 years. That is why I intentionally made no mention of it in the series.
bro thank you really! this is so simplified much thanks again
Glad it helped! You're welcome =)
Hey quick question, should the /28 network sitting behind R2 be "9.9.9.48/28" instead of 9.9.9.32/28 because the /27 network has a group size of 32?
9.9.9.0/27 includes 9.9.9.0 through 9.9.9.31 (which is a total of 32 IP addresses). The next available IP would be 9.9.9.32, which is where the next block (of /28) will start.
Let me know if that makes more sense.
Beautiful explanation, thank you!
You're welcome, Alitta =)
Why both addresses in /31 are usable hosts addresses? I understand there's no need for a broadcast, but what about network id?
The Network ID being unusable was sort of a relic of ancient networking. There is nothing about the "first IP address" that makes it unavailable for use... it was sort of arbitrarily decided that way back in the 70s and 80s when the "IP" protocol was being written.
Case in point... IPv6 totally allows the use of the first IP address (what would be the "Network ID" -- but IPv6 doesn't have a Network ID).
10:04 I was confused for a bit cuz you only said "you don't need a Broadcast IP", but then I guess we also don't need a Network ID, since there are only two devices in this subnet. Though this type of subnet can only be identified using its two IP addresses and its subnet mask according to GPT-4, however that's done...
Great playlist though, long road ahead but trying to power through it!
Yup, pretty much! Remember this was an exception added after the fact to help save IP addresses. So it sort of breaks the original rules a bit.
Your are awesome every videos you have are easy to understand
Thanks for the kind words. Glad you enjoyed the content!
Practical Networking bro you have not update any new video just want to know what’s is going on
@@HinSela It takes me a while to put together videos at this level of quality. I'm getting better at it, and at completing them faster. But I also can't work on videos 24/7 =/
Practical Networking so u must be an CCIE level
Practical Networking you know what I can do a subnet just only 30sec haha
Great video ! I do have one question though. If the requirement host IP address is something like 1000, then we would have to reach sub /24 CIDR. Do you have a guide on VLSM with a large address requirements?
Absolutely Perfect !!! Thanks !!!
Hello,
I understood how to solve the problem using visualisation. But I am afraid how can we solve this without visualization?
So glad you asked =). There's a video about how to solve these using only scratch paper and no visualization:
ruclips.net/video/2i_2za40vZg/видео.html
=)
I cannot tell you how valuable your Subnetting series was to me!! Quick question: On VLSM networks, with one subnet needing 16,000 hosts, the next needing 8,000, and down the line, if I am given a CIDR of /16 to start with , does the cheat sheet still work? i.e. keep adding CIDR's like it did in vid 6/7?
So glad you enjoyed it =).
Unfortunately, no, ithe cheat sheet wouldn't help you there. The Group Size represents the # of IPs, but only for /25 - /32. Once you go bigger than that, I would recommend 2^N strategy to calculate number of IPs.
For example:
In a /24, there are 24 bits in the Network portion, which means 8 bits are remaining, and 2^8 = 256.
In a /20, there are 20 bits in the Network portion, which means 12 bits are remaining, and 2^12 = 4096.
Hopefully if you're being asked to carve out blocks of 8000 and 16000 IP addresses your instructor is letting you use a calculator =)
You have a great teaching style - You've just got a new subscriber! Do you know whether these types of questions will come up on the CompTIA Network+ exam? The Exam objectives does say VLSM (given a scenario, configure the appropriate IP addressing components)
Glad you enjoy it! Thanks for the subscription!
If VLSM is on the exam objectives, it's safe to say you may get VLSM questions on the actual exam.
Almost guaranteed you will.
Amazing videos. Thank you so much! Maybe I missed it. Did you go over how to get the number of networks in a particular subnet?
Thank you! Yes, I covered that in the FLSM video: ruclips.net/video/F05sDLXOFh8/видео.html
i feel like im learning from a paid course ... its so perfectly explained
Sir how 48 is coming at 9:30
Thanks for the help!
Happy to help!
Thank you!!! Icnd1 is next month.
Good luck!
Thank you for your videos. They are all truly incredible. At 9:43, the point to points are 9.9.9.48/30 and 9.9.9.52/30. If we applied the same method from the second portion to the first portion, will the following information be correct:
50 = 9.9.9.0/26
25 = 9.9.9.64/27
10 = 9.9.9.96/28
Point to point 1 = 9.9.9.100/30
Also, would it be incorrect if:
Point to point 2 = 9.9.9.228/30 ? Thank you.
You're welcome =)
You're very close! 9.9.9.96/28 includes 16 IP addresses (.96 - .111). So 9.9.9.100/30 wouldn't be a usable /30. The next /30 would be 9.9.9.112/30. Otherwise the rest looked good.
You're also slightly off on your 2nd Point to Point. Instead of giving you the answer, why not give it another go? Consider what you may have learned from the correction above.
@@PracticalNetworking I see the error I made. Phenomenal videos and same day responses.. Keep up the excellent work. Thank you!
Glad to help, friend. =) Cheers!
Why /24 uses ip address start from 9 ?
1-126 supposedly for class A ?
Address Classes are no longer relevant. They are an artifact of history. More details here:
www.practicalnetworking.net/stand-alone/classful-cidr-flsm-vlsm/
Will this come up in the Network+ exam? Or just videos 1-7 in this series?
YOU ARE THE BEST AND THANKS ALOT !
You're welcome! =)
THANK YOU SOOO MUCH! ❤
You're welcome!
Great Work!
Thanks!
Ok, but how to do it fast? There is no time to draw such big cidr table with colors
Great question. This is exactly why being able to solve the "next network" value described in Videos 1-7 is important. If you organize the networks you need to solve for from biggest to smallest, the "next network" will always be the start of where the next block you have to assign begins.
Honestly I should make a video about this... what do you think?
VLSM is very interesting 😊
Can you plz provide a questions for practice such conditional questions answer that would be a great help
I would love to. I have plans to one day expand SubnetIPv4.com to include VLSM question generator as well. But there is no timeline at this point.
so I would see it this way: learn it, practice it, then use... online calculator on the daily basis, right?
7:31 why 9.9.9.192? can't we just use 9.9.9.96 /27
Because those IPs are in use from the 9.9.9.64/26 assignment from earlier.
You mean to say that, if we use from greatest to least so that there wont be too much loss of ip address
?
It allows the assignments of IP networks to flow more easily. You won't have to go back and carve more IP space out of blocks you've already passed.
@@PracticalNetworking thank u
Thank you so much!
You're welcome!
This chart of vlsm is time consuming we have only 90mins to cover up the exam how can we solve the vlsm questions?
I imagine you are referring to the visualization of the network space broken up in twos over and over again? That is simply something to show you visually how to solve VLSM problems. Once you've worked through a few practice problems, you'll start to no longer need it and can simply do it 'by hand'.
Great videos
Glad you like them!
excellent video! thank you very much
You are welcome, again =)
out of the box....supereb.
Thanks =) Cheers!
Thank you!!
You're welcome!
Thank you!
You're welcome =)
Thanks man
Lifesaver
;)
Thank you for the great videos! Great quality and informational. I have watched them all and sub'd. I have a special request if possible: show subnetting/vlsm for larger groups? Example something like you have ip 172.20.9.0/22, need to break into different subnets for users in each group; 450, 300, 150, 50. How do I subnet the large groups? How is it addressed between 172.20.9-10... since there's only 255 hosts in ...9.0, right? I hope this is understandable enough :S thanks all the same!
You'll want to start with becoming comfortable solving for number of IP addresses in the /24 through /17 range. You can watch video 6 and 7 for instructions on that.
Once you've done that, the process is the same as it was in this video: Start with the biggest network, assign the appropriate size network and subnet, then solve for the Next Network ID of the block you just assigned -- the next subnet you assign will start with that IP address (regardless of it's size).
Hope that is enough to get you started. Best of luck!
👍👍👍
I'm a tad retarded so maybe someone could peer review what I did and tell me if it's viable?
(/26 for 50 hosts) 9.9.9.0 - 63 *(First number is Net, last is Broadcast)
(/28 for 31 hosts) 9.9.9.64 - 127
(/27 for 25 hosts) 9.9.9.128 - 159
(/27 for 19 hosts) 9.9.9.160 - 191
(/28 for 12 hosts) 9.9.9.192 - 207
(/28 for 10 hosts) 9.9.9.208 - 223
Routers. Once I got to this point I wished I assigned them lower numbers
(/31 for 2 hosts) 9.9.9.224 - 225
(/31for 2 hosts) 9.9.9.226 - 227
For this one: (/28 for 31 hosts) 9.9.9.64 - 127
Did you mean /26? The rest of the math is done as if it were a 26.
Otherwise, yes. That is viable solution for the problem set in the video.
@@PracticalNetworking yes thank you I probably just got mixed up
Woi! Part 2 come out.
You doubted? ;)
@@PracticalNetworking Nah man, it was an expression of excitement at first look.
@@hennessy6996 =) Glad you are excited! Let me know what you think of the video!
@@PracticalNetworking Hi
Really good video. I really like how you incorporated the real world aspect for VLSM.
One thing I was looking for was an example that uses the 3rd octet in VLSM. Consideration for an example such as a college campus student wi-fi or similar. You know for cases when you have to consider a subnet size of 1200 IPs or so where a CIDR of /21 would have to be used.
The process is the same. You're just using bigger networks and subnetworks. Video 6 in the series will teach you about working with subnets in the 3rd octet, and specifically, how to determine the number of IP addresses. That would tell you the network sizes you need to "carve out", and then the process is the same as the beginning of the video where we kept cutting things in half, or the part of the video where we broke the /28 into /30's and /31 networks.
Woahhhhhhhhhhhhh!
;)
VLSM pretty harf to me, I watch it 5 time 😅
Daba ke thoko like! Jay Mahakal!!
jay Mahakal!! daba k like thoko yeh ek do like k liye nai mehenat kar rahe !!!
@@fluid_sky Yeh toh bhavuk ho gaya. Arey abhi toh bohot duniya dekhni baaki hai beta!
from 8:12 to the end: I don't understand the part with 3 routers