How to work with VLSM in the Cisco CCNA -Part2

[@davidfinley406]

STILL the best tutorial on VLSM I've found.

[@melanionhendra8753]

I've spent the entire semester trying to wrap my head around this. You just taught me more in 5 minutes than I got in 12 weeks of a uni course. You're a goddamn hero, mate.

[@nobleminstrel]

Hi Sir, I'm an IT student and the struggle on making the final projects on other subjects, resulted to sacrifice the time for my networking subject and It's our examination today about VLSM and subnetting. I just wanted to say Thank you so much Sir you've helped me a lot. Blessings, and May you have a great day. :-)

[@motleywells]

I was so lost my teacher wasn't helping me understand either. Watched this video and finally understand. Thank you. You saved me from failing!

[@Jerrel28]

I know this video is going on like 10 years old, but these are gold Dan. I've learned so much from these subnet videos. Never delete these videos, they are a treasure trove of information.

[@mikeylazer]

wow i learned more from this 10 minute video than i did during my 3 hour lecture in CCNA 1

[@PaulMacLeod1]

Dan, you are the man! I'm midway through my CCNA boot camp, and have been struggling with subnetting - your two videos have helped so much!

[@seldian]

This is probably one of the best videos i have ever watched for networking concepts.

[@mikecarter79]

This is the best and most concise explanation of VLSM I have see on youtube. Thanks Dan !!

[@bfradette]

my ccna 2 final is tonight. I did not expect to pass my skills test, due to utter confusion about VLSM. Now, I feel I will do fine on this part. My instructor used a pie chart to explain it, and it seemed fine, until I tried to do it myself. This method you show is how I will attack the test in a few hours. Thank you.

[@maimunahussain94]

Literally the best VLSM tutorial I have seen so far in my studies for CCNA. Thank you so much

[@danscourses]

@Rams709 if you want 300 hosts the subnetting or borrowing of bits in the subnet mask will happen in the 3rd octet

[@didancc]

Absolute BEST video! Your tutorial totally crystallized the meaning & how-to of VLSM for me. Thank you!!!!!

[@JOKBO1]

Dude u helped me so much, i dunno if i'm going to pass the exam because there is a lot of theory there but this is what it's all about, i tried to read the course materials but i couldn't get it and now i do.THANK U!

[@danscourses]

@geyercr The first subnet (network) is 0 (0-127) and the second subnet (network) is 128 (128-191).

[@jassy0479]

THANKS DAN!!!! ANOTHER GREAT VIDEO! you are much more simpler and effective than many others ...thanks

[@michaelmutawakkil6978]

This video was the key and the light for my CCNA studies, thank you very very very very much Dan.

[@ace05hun]

Oh my god thanks Dan. I learning in Hungarian, the CCNA but i not understand anything that lecture says in VLSM. But your video is explaining very good so i understood. Thanks again Dan!

[@danscourses]

@Jehangt3 Hello its easy /24 or 255.255.255.0 is 256 hosts (254 usable). /23 or 255.255.254.0 is 512 users or hosts. /22 = 1024, /21 = 2048, /20 = 4096, /19 = 8192, and so on... it all makes sense when you think about it in binary as 32 bits with 1s on the left and 0s on the right. /19 = 11111111.11111111.11100000.00000000. In this situation the zeros are the hosts 2 to the 13th power or 8192

[@iswoo10]

It took me a while to get it at first when I started the ccna program, but now that I'm reviewing what I had done in the past it makes perfectly sense ;-) Iswoo

[@lioii]

I think it would be useful to clarify for someone new to VLSM that thet should... a. First establish the number of networks needed. b. Work from the largest requirement to the smallest Maybe that's obvious to some but useful for someone who's looking at VLSM for the first time...

[@lioii]

Volf Khat No, you must establish number of networks needed first but recognise the fact that a /27 is insufficient to satisfy all the requirements. Hence VLSM...

[@Fabi43]

Hi Dan. First of all: Thanks, thanks and thanks. You put your soul in your teaching and that cause all this stuff to be easy to understand. I wanted to draw your attention to a little mistake: in the network that you use for the 13 stations you say that the usable hosts go from 192.168.1.224 to 239 when you should've said 225 to 239 (224 is the network). Fabian.

[@Quellos007]

@danscourses you are right, first subnet is 0-127 but use able addresses are 1-126

[@sebbis]

Nice work, i finally get it. Don't stop making these.

[@plyguard72]

Thank you so much. You made VLSM so easy to understand!

[@ramirez368]

To me it definitely made a difference and what help me at least to understand the concept that the next network where start and stop!!!!!! like for his example to cover the128 users it starts at network 0 and it stops at the next network 128.......meaning that the first network is going to cover 0-127 (last octat), because I first I thought why did it get 128 for the second network and that's how I got it....you always consider the next network considering the range of the previous network and that will tell you where the new network starts

[@Snippsie]

Very good guide, helped me understand really quickly - now I'm getting everything on my worksheet correct really fast! :)

[@higginsjoe]

Thanks a million!, 2 very helpful videos that got my head around it after hours of reading through notes, well done:)

[@Nerdzillamit]

And the light bulb just went on! Thanks Dan! You rock.

[@flickadmin]

Thank you very much !!!! Its Great tutorial regarding VLSM and CIDR. I have some confusion on this area, now its clear !!!! Great !!!!

[@johanoosterwaal]

thanks man i lost track of how the vlsm work but now i know again

[@AussieRaver1996]

You have saved my ass from my Networking Essentials final exam :) THANKS!

[@PaggosBlitz]

Depends how large the networks are. If you're dealing with huge networks, I'd put some on the 169.13.10.2 and another on 20.2, etc, but if i could manage each segment, I'd put it all on the same, but with different networks they could still communicate with a routing protocol. RIP, OSPF,etc.

[@Omarcito2003]

Never mind, I went back and review it and now I understand why you used 224.

[@danscourses]

@geyercr You cannot just say this is wrong....what is wrong? Which network or subnet is incorrectly configured? Are there any networks that cross over into one another? If you cannot show which one then you are mistaken I have been teaching this for 8 years.

[@bboosss1065]

best videos ever made on ccna topic thanks you!

[@kidroys]

this is great, i understood the whole sub netting in one go, thanks dude

[@Zephilwroxt]

You are a genius Dan! Thank you for your great effort!

[@danscourses]

@Quellos007 yes that is true!

[@Xxyousif145xX]

Best VLSM Tutorial i found, Thank you so much !!

[@HobieHenning]

Great video! I understand VLSM's a lot better now

[@digitalx788]

This is a very helpful video .I feel more able to ans VLSM questions

[@hewsme]

may god bless you dan ... thanks a lot ..you saved my life .. thnx mister .. thnx sir

[@Rmiller07]

This is great, just like all of your other videos. I just wish the language of "usable hosts" vs "addresses" was more consistent.

[@gordonosullivan]

Good tutorial Dan. Question,Should these networks not be starting at 0 if ip subnet zero is enabled ? Also for the /30 networks Could you use 192.168.1.0 /30 192.168.1.4 /30 to avoid the overlap ? Thanks

[@ThunderRodriguez]

Thanks a lot for this video, it really helped me understand VLSM and subnetting in general! Subscribed for future reference :)

[@johnnewman5098]

makes things so simple ...thanx a lot

[@Omarcito2003]

Dan, On the network that needs 13 users, can I use the 208 network instead of the 224 network, the reason I ask is because after the 192 network, only 13 users are required for the next work therefore, I just add 16 to the 192 which equals to 208 with a mask of /28 will that work as well?

[@shay00795]

great tutorial and explanation. Helped out a lot.

[@Angel61323]

If someone could answer this that would be awesome, so if i understand this part right, the reason you were able to put 244 and 248 are because that from the last octet in that ip "240" and the subnet "252" are valid addresses? so your actually could have given those networks any number between 240 and 252?

[@daveboogie1]

Question, Could you do a similar video based on the 3rd octtet i.e 129.64.*.0, if you don't have time could you tell if it is the same method because I use a slightly different approach when doing non-variable subnetting. Great vid though really helped. Keep it up.

[@MEHHFIZ]

What will be summary route of all these subnets

[@Manoj_Mak]

Hi.. I have a question for you. In this video, the third subnet starts with 192 and ends with 223. It has 32 IP addresses but 30 are usable and you have only 30 users in that subnet. It is ok that you have fulfilled all their requirements. But what IP address are you going to assign for the routers ethernet interface which is connected to that subnet?

[@Ayalae2010]

Thank you so much; very clear and concise.

[@jassy0479]

@geyercr You are thinking Class B subnetting whereas the example here is a class C network- 192.168.x.x

[@TheMoviesManX]

Thanks you so much , I really needed this tutorial !

[@rbaake]

Dude, great job, this helped me a lot!

[@akhilkumar87]

Very much thanks to the uploader appreciate that

[@joyceww3]

cheers man iv a test tomorrow ya saved my ass but i do it a bit diffeent but ya refreshd me mind

[@zzyy210]

What if they didn't tell you how many networks that you need it? Where do I start with my subnet addressing?

[@therealnpc]

does the ccna require you automatically do 15% growth on addressing or will they tell you

[@Rams709]

Let's say I want to add an 8th network now with 300 hosts. You have to change the third octet number on its IP?

[@powerbook1]

Thanks for the two videos :)

[@SvenCheddar]

Ok my lightbulb just went off. Is it normal to calculate your network links at the end after you calculate your subnets? The links between routers that only need 4 addresses i mean

[@Dihtung]

Thank you, it really helped me to understand.

[@GingerRasp]

Very good explanation - thanks

[@TheSword3000]

DAmn! You made this look eazy!

[@Pl4sm0]

great explanation .....you made my day .......thank you ;)

[@MrHorizonkid]

If a user behind the first network with a subnet of /26, wants to access another host with an IP of 67 let's say. Woudn't the user which has an IP after 64 will automatically be in the different network even though being under the same /26 subnet?.

[@moatasemsalman5284]

very nicely done thanks for explaining

[@smadiz]

Good video. Really helpful. Thanks a lot

[@SeanYves09]

@danscourses hi, why do you have 244 and 248

[@rogerandreeta8006]

Excellent explanation. Thank you!

[@JOKBO1]

@SeanYves09 should it be 245 and 249?

[@TheSword3000]

@sinlap Hey, thanx SinLap- i'll check it out! Have a great weekend!

[@wrtoll]

Good job,Easy to follow Thanks

[@karimadel8496]

very nice to the point and quick thanks so much for the video :)

[@DanielTownend]

This made perfect sense, thanks!

[@TheLouh86]

Great Viedo, on VLSM and CIDR

[@mohamed-bk9yj]

hi,i think On the network that needs 2 users 192.168.1.224/30, that should be 192.168.1.248/30 and via -192.168.1.252/30 is it ? thax cheers!

[@rkcst6503]

excellent explanation.

[@JonnyBeoulve]

Thank you Dan!

[@TheSword3000]

I understand everything here except how he came up the 4th octet numbering scheme- could some one explain this this clearer for me? Thanx!

[@staggerii]

Great explanation!!

[@alvin6607]

why do we need to use /30 instead of /29 for the 2 users?

[@When_Disaster_Strikes]

Alvin Seah Song Qian Because you need two additional IP addresses for the network and broadcast addresses. If you need 2 "user" addresses for your subnetwork, you will need at least 4 total IP address: 1 for the network, 2 for the "users", and 1 for the broadcast.

[@Joe-zx6jb]

This is a good question IMO and I'd love to hear the answer. Lawrence's reply doesn't make sense to me. I get the whole subnet id and broadcast address concept but if I'm not mistaken, a /29 would still give you 6 usable hosts (the next bit in line is the 8). Doesn't making it a /30 give you 10 usable hosts, which would then screw up the other two links because you ran out of subnets? Heck, even using a /29 you might not be able to squeeze in the other two links.

[@slizza90]

It's best practice in VLSM to be efficient and don't waste address space. It's /30 as that make the most efficient use of the address space.

[@asadullahfringi4190]

Awesome, thanks for the help

[@marthyh]

Verry Good now I understand !!

[@BeatBasement]

Thank you Dan.

[@HouseJunk1e]

thank you so much, helped alot. i subscribed.

[@yunatilmitt2]

Thank U so much! Finally get it :)

[@ketchum57a]

Thank you, very well done!

[@TheMatteLS]

but its a good guide sorry for my bad eng :D can you plz make a overlapp giude i got exam on friday :D and you explain great ! :D

[@GilliamFlebus]

Thanks! This helped a lot ;)

[@danscourses]

Watch my videos on the Magic Number. In binary, count the number of zeros and 2 to the power of that number is the number of hosts. i.e. 11111111.11111111.11111100.00000000 the hosts equals 2 to the 10th power which equals 1024.

[@TheMatteLS]

i have not reed anny other comments but why do you make subbnets so small? if you whant to make it bigger you have to change the subbnet masks. why not make a 255.255.255.0 and get 254 host in evry subnets? then if you whant to add a new router i just have to plugg it in? you got 1 router out to the Internet?with 1 ip addres right? then you can make you own network inside and you can joust wast with your IP-addresses no need to be so exactly :D

[@rxseqvartz5679]

Wow

[@MBP6705]

Thank you so much.

[@iPROFITDON]

I'd give you a hug if I could :c

[@slindorj]

Hmm, so he didn't borrow 31 bits for the last 3 networks because of first and last unusable hosts?

[@EmanuelCz]

in that particular case only 2 host's are needed for those 3 networks, and yeah, you have to take into account the usable host's and unusable host's out of which the first one will result in the network ID and the last one the broadcast address, leaving you with exact 2 usable host's.

[@nmarinpe]

Thank you !! :)