spending whole semester dealing with a fine strategy to solve subnetting questions ,and here we go 9 minutes of explanation and all my doubts solved .that's magic of correct teaching method.
Sir you are truly gifted. I have direct this video to many people and it was like the heavens opened up. I did have to watch a few times to get the rhythm, but it was worth it. I now understand how to do a subnet. Thank you so much.
OMG- After having one of the worst Cisco teachers EVER and struggling with subnetting for over a year. Your 10 minute video cleared all confusion and made it soooo simple. THANK YOU
Hernan Hernandez I didn't know ANYTHING about subnetting before I watched this video. And after I did, I practiced on subnetting.net and managed to solve almost all problems. This guy is great!
Cant thank you enough,, i have seen tons of videos on IP subnetting but nothing helped, This video is awesome,,,you made it so simple and easy for beginners like me!!!!
I like your videos a lot! I just want to point something else out: Unless I'm wrong, you should have 3 subnets there because the connection between routers is also a network! It is a little confusing the way it is presented. Having said that, TY for uploading, and I appreciate the hard work you put into these! Matt
You probably dont give a shit but does any of you know a tool to get back into an instagram account? I was dumb lost the login password. I would appreciate any assistance you can offer me
Failed CCNA exam twice thinking I had it both times. I'm not sure if I want to go for a third. That thing is pure, ego-destroying evil . Feels like I've been assaulted in a dark alley by a gang of 1's and 0's, all of which were of course, wearing /masks. You win Cisco.
Thank you so much !! I watched your other videos. Your way of explaining things are excellent to people like me who are new to this area. Thanks again for your great work !!
Having been a graduate of Cisco Acadamy in 1998, this is a great refresher. I just wish I did not have a unknown sickness from making me study harder and obtain my ccna. My first job would have made me make well over 70,000 the first year. I install routers and switches all day long just that the remote cisco engineer does the software and want to break away from Nationals and have my own customers.
yes you could say that. When you subnet a network from say a /24 to a /28 (255.255.255.240) you are breaking the one network into multiple smaller networks
@relisys001 Yes, if the netmask is 255.255.255.0 then they are both on the same subnet or network, 192.168.1.0 /24. To make to subnets 192.168.1.0 and 192.168.1.128 you would need netmasks of 255.255.255.128
It was not professional Dave, it was done off the cuff in class with no script and no prior preparation, and it is free. I think everyone gets the point of my subnetting techniques even with the minor imperfections. Also, the point you are making is old news, I put an annotation note at the top of the video letting everyone know there is a mistake.
excellent teaching. by correcting the IP Address from 192.168.1.47 to 192.168.1.46 shows the teacher is well experienced in Network and Broadcast addresses
Truly speaking ........have you noticed that on the right side the IP Addresses are in 192.1.1.0 network.......and the left side is 192.168.1.0 network..........the concept is fine but I can argue with that because he said it can't be in the same subnet .......
Good apart from the fact that the right hand network is 192.1 when the left is 192.168. I'm not the best by a long shot, but surely the subnet isn't as important
Duh!! Double-Duh!!! I have always been able to see the powers of the "borrowed" borrowed bits. Ie. 128 & 64 place. Two bits. 2 to the 2nd power = 4. Four subnets. But what really drove it home is when you pointed out the position value of the 2nd borrowed bit, "magic bit", in this case 64!!! Yes! I see the light! I was using up a whole page of notebook paper on each subnetting problem. I can do them in my head now.
I"ve been looking around and this is one of the most simpliest technic i've seen. thanks: I didn't even notice the IP's I was more concerned ont the break down. thanks:
@danscourses hahaha, It was there in front of me, Ive been working so hard to learn this stuff my brain had switched off. Id got the /25 CIDR Notation in my head (because thats what you started with on your white board) and couldnt figure out how they could be not ben on the same subnet, but to get the fact that /24 is 255 (one whole subnet), where as you where doing /25 which is 2 ;-) Thankyou so much
@danscourses So as I'm understanding this both switches/routers need to have the subnet of 255.255.255.240 and that automatically breaks the network up into block addresses that are easily chunkable and therefore easily on different subnets?
Or does it depend on how you look at it? That is, rather, would we say: any less than 8 activated 1 bits in the 3rd octet are now considered additional bits that we've activated in the 3rd octet, having gone beyond the 2nd octet?
I wasnt having a go but since your name is danscourses I thought you might have some kind of business attached to your RUclips account. If it was me I would have reuploaded but anyways. Your other material seems good and your helping other learn so good job :D
I was using the term “Least significant Bit” but magic number is way cooler. Totally lost about the 192.168.1 on one network and 192.1.1 on the other. How one network is subnetted has absolutely nothing to do with how another network is subnetted as far as I can tell. Thanks for enlightening us.
So the last usable host cannot be included as the end number of the range? (that's why you had to change the 47 to a 46, right? because 47 is not included? I know nothing about networks or anything so this is just a video I stumbled upon to make some sense of things. Thanks.
pls do u mind explain g where u got 47 to 48 becos the binary is 128,64,32 and 16 so the magic number moves from 0-15,16-31,32-63,64-127,128-239,240-255.
I know you are just trying to illustrate something here, but in the example you have 2 routers, but only one of those routers can have the 192.168.1 network, correct?
the first three octet of the two routers are different meaning they are in different network so how can you classify that two different networks into single groups of subnets?
I have a question, if all those subnets use the same subnet mask, how do they get established as a range of hosts that talk amongst themselves? does that happen when you create a VLAN? does a VLAN contain the range of hosts it will be using?
Hi Dave. A VLAN is a layer 2 concept. I will get back to that. When a packet is sourced from a machine, it has a destination address. The routing logic on the sourced machine makes a calulation using the configured subnet mask on the machine. This initial calculation determines one of two things. The packet is destined to a different subnet block or part of the block that the source machine's subnet is on. Because of the subnet mask, the range is established. IP is overlayed on top of layer 2. For IP hosts addressed on the same subnet block to communicate, they must be bound to MAC addresses on the same layer 2 VLAN. VLANS are configured usually via ports. Subnets and VLANS are two seperate concepts.
Im pretty good at maths but this really is hard to grasp, I used to run books for horse racing, most people dont get that, however I found it easy, this takes some getting ones head around.
this explanation is indeed right if you consider having 2 networks then the correct answer is /28 but you wrote "all addresses should start with 192.168.1, i wrote 192.1.1 by accident Thanks to mikjet to point out " on the top of the video, then the answer /26 would be correct.
I know it was 5 months since you posted this comments, but I just had to point it out. You said "this explanation is indeed right if you consider having 2 networks then the correct answer is /28 but you wrote "all addresses should start with 192.168.1, i wrote 192.1.1 by accident Thanks to mikjet to point out " on the top of the video, then the answer /26 would be correct.". That is incorrect, because if you have two networks using the same IP addresses there can be problems. Imagine you have PCs with the IP 192.168.1.2 ans 192.168.1.3 on one network. And then you have the same IP addresses on two PCs in the other network. Now, if you were to ping from 192.168.1.2 to 192.168.1.3, you would only be pinging the PC in your own network. You would never get to the thetwork over on the other side, because the router would not know that you wanted to go there.
ive read so much and watched videos but I still get confused as to why you would have different subnets. Why does it matter what number im using. Surely I can pick any and use that. Can someone please explain.
ok, so i'm confused can you help me? if you have an ip address and the last number is /24 then the network's go up by 1? is that right? cause the LSB is in the 1's place so the first network would be 0-1?
Ive been asked a question : Are the IPv4 addresses 192.168.1.200 and 192.168.1.24 on the same subnet, both have the same subnet mask of 255.255.255.0. I thought not as I thought 255.255.255.0 had 2 subnets 0-127 and 127-255 ? ? Im told they have the same subnet, please help
how do i find the ip addresses of each computer. I have an assignment which asks me to create three networks with each network having 8 computers. How do I calculate the the ip addresses for each computer and router ?
The first address and last address in a range (in this case 32 and 47) are reserved addresses for the network number and broadcast number. Because the device shown is a computer which needs a HOST address to operate, it would not work on the broadcast address. 46 is the top host address in the range which is why it was changed.
Prior to reading the comments below I understand where Mr. Dan was going with this, provided if we were in the same network of 192.168.1.x. (since we saw 192.1.1.x) Was this an honest "typo" mistake? Aside from the "typo" I was able to follow along with ease through the walk through provided... Thank you very much +danscourses !
I don't understand how they would all be in the same subnet with options A) and B) when the ip addresses are 192.168 and the 192.1 ?? Could you explain please?
Network structures remind me of space a little bit and different solar systems etc. Anyway I wrote out a flowchart of my network to a T,and even gave then names too. It's not even that big either, the most complicated thing on my network flowchart is the firewall of course with modified rules blocking specific IP addresses most of them located in China and India.
![Felix "Unfair" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/Oswujxm2Ag0/mqdefault.jpg)
spending whole semester dealing with a fine strategy to solve subnetting questions ,and here we go 9 minutes of explanation and all my doubts solved .that's magic of correct teaching method.
Sir you are truly gifted. I have direct this video to many people and it was like the heavens opened up. I did have to watch a few times to get the rhythm, but it was worth it. I now understand how to do a subnet. Thank you so much.
OMG- After having one of the worst Cisco teachers EVER and struggling with subnetting for over a year. Your 10 minute video cleared all confusion and made it soooo simple. THANK YOU
Thank you so much. I missed this class. One class makes such a big difference.
Your videos completely made me get subnetting. I was struggling with it until i watched your videos!! Thank you so much.
Been a struggle but not anymore after watching this video! You are such a genius in explaining...
Excellent work on this. Far more understandable than other subneting video/articles I've watched/read.
I have to disagree. Just because he knows his stuff doesn't mean he can teach it very well. This video is a great example of that.
Killed Fromafar I found this easier to learn than other videos I've seen and articles.
Yup, despite the two mistakes, this is very nicely laid out.
I hope I'm not exaggerating, but this honestly taught me everything I needed to know regarding subnetting. Very clear! Thanks!
Hey man, I feel the same way. This video literally blew my mind.
Hernan Hernandez I didn't know ANYTHING about subnetting before I watched this video. And after I did, I practiced on subnetting.net and managed to solve almost all problems. This guy is great!
Yeah Eddie! Absolutely, I've been watching other videos but nothing compares to this one. Keep it up Networking bud
Probably the best VIDEO on this I've come across on this subject.Thanking you.
Exactly what I was looking for. Going to ace my exam now. I love RUclips.
Great Vid Dan. Ive been trying to grasp this concept for a while now, and this is the first time it "clicked" Well done!
Dude i've been trying for months to understand this!! and just 1 day of watching your video and i passed the test!
Thank you so much for the help!!
Out of curiosity: are you still in networking?
Woah! The way you explained this, solved all my questions regarding sub-netting. You made it look so damn easy! Kudos! :)
This definitelity changed the game. He said it's a hard questions. Now it's easy. Thanks +danscoures
Cant thank you enough,, i have seen tons of videos on IP subnetting but nothing helped, This video is awesome,,,you made it so simple and easy for beginners like me!!!!
Thanks Dan! This really helped! Been struggling for AGES!
I'm still learning the basics of subnetting & don't understand it in totality but this has helped me tremendously. Thank you!
I like your videos a lot! I just want to point something else out: Unless I'm wrong, you should have 3 subnets there because the connection between routers is also a network! It is a little confusing the way it is presented. Having said that, TY for uploading, and I appreciate the hard work you put into these! Matt
Initially struggled but eventually got it, thanks man !!
You probably dont give a shit but does any of you know a tool to get back into an instagram account?
I was dumb lost the login password. I would appreciate any assistance you can offer me
Failed CCNA exam twice thinking I had it both times. I'm not sure if I want to go for a third. That thing is pure, ego-destroying evil . Feels like I've been assaulted in a dark alley by a gang of 1's and 0's, all of which were of course, wearing /masks. You win Cisco.
Its nice to see someone put subnetting into context and have a diagram. My teacher only wants to teach the math part.
thanks, i've watched many videos on this and each time it gets a bit clearer... your's is nice and simple and to the point, great stuff
Thank you so much !! I watched your other videos. Your way of explaining things are excellent to people like me who are new to this area. Thanks again for your great work !!
Even with the 'mistakes' I found this video easy to follow , easier than my text . Thank You.
Having been a graduate of Cisco Acadamy in 1998, this is a great refresher. I just wish I did not have a unknown sickness from making me study harder and obtain my ccna. My first job would have made me make well over 70,000 the first year. I install routers and switches all day long just that the remote cisco engineer does the software and want to break away from Nationals and have my own customers.
You definitely have me as a subscriber now, keep making videos :) your explanations are the easier I've found thus far for anything networking.
I just wanted to say. Thank you SO much for this video! SOOOO MUCH HELP
Wow. And damn it at the same time. My phone got stolen and the person who stole it subscribed to your channel, I watched it and it was amazing!
yes you could say that. When you subnet a network from say a /24 to a /28 (255.255.255.240) you are breaking the one network into multiple smaller networks
@relisys001 Yes, if the netmask is 255.255.255.0 then they are both on the same subnet or network, 192.168.1.0 /24. To make to subnets 192.168.1.0 and 192.168.1.128 you would need netmasks of 255.255.255.128
Thank you! You made it easy to comprehend subnetting. I have the basics of it down after watching this.
It was not professional Dave, it was done off the cuff in class with no script and no prior preparation, and it is free. I think everyone gets the point of my subnetting techniques even with the minor imperfections. Also, the point you are making is old news, I put an annotation note at the top of the video letting everyone know there is a mistake.
excellent teaching. by correcting the IP Address from 192.168.1.47 to 192.168.1.46 shows the teacher is well experienced in Network and Broadcast addresses
Truly speaking ........have you noticed that on the right side the IP Addresses are in 192.1.1.0 network.......and the left side is 192.168.1.0 network..........the concept is fine but I can argue with that because he said it can't be in the same subnet .......
Correct! This would only work if all of the segments were on the 192.1.1.0 subnet with the corresponding Masks
Thank you Dan ... your videos are the best teaching videos I have found on this subject.
Good apart from the fact that the right hand network is 192.1 when the left is 192.168. I'm not the best by a long shot, but surely the subnet isn't as important
James Pollard
Thanks so much for this.. N+ exam in 2 days and I now know and can explain to others what a subnet is and how to work out magic numbers.
Great Job at explaining at an easy to understand level! I've watched several videos on this subject. This easily one of the best!!!
Thank you dan, im really enjoying these videos its helping me learn a heap for my CCNA. keep posting definitely appreciate it! your a great teacher
Others video,s show only theory....
you show real world scenarios thx great teacher
@mikjet Yes I think you are right, all addresses should start with "192.168" thanks for pointing out the mistake.
or the 192.1.1.0 /24 address block
Duh!! Double-Duh!!! I have always been able to see the powers of the "borrowed" borrowed bits. Ie. 128 & 64 place. Two bits. 2 to the 2nd power = 4. Four subnets. But what really drove it home is when you pointed out the position value of the 2nd borrowed bit, "magic bit", in this case 64!!! Yes! I see the light! I was using up a whole page of notebook paper on each subnetting problem. I can do them in my head now.
You are right mate, he made it look so damn easy! Really, he just made me a subnetting master now! :)
that's one hell of a six u created there! thanks man it helped allot
Wow, thank you. Something finally clicked in my head based on what you said!
I"ve been looking around and this is one of the most simpliest technic i've seen.
thanks: I didn't even notice the IP's I was more concerned ont the break down.
thanks:
i'm studying for net+ and man this really helped.. thanks!!
That sneeze freaking made me jump.....
Excellent demo.its cleared my concept of subnetting
@danscourses hahaha, It was there in front of me, Ive been working so hard
to learn this stuff my brain had switched off.
Id got the /25 CIDR Notation in my head (because thats what you started with on your white board)
and couldnt figure out how they could be not ben on the same subnet, but to get the fact that /24 is 255 (one whole subnet), where as you where doing /25 which is 2 ;-)
Thankyou so much
Thank you for your nice video. That helps a lot of people.
@danscourses So as I'm understanding this both switches/routers need to have the subnet of 255.255.255.240 and that automatically breaks the network up into block addresses that are easily chunkable and therefore easily on different subnets?
Or does it depend on how you look at it? That is, rather, would we say: any less than 8 activated 1 bits in the 3rd octet are now considered additional bits that we've activated in the 3rd octet, having gone beyond the 2nd octet?
This was eye opening to me. Great help, thank you
Great video and ignore those who are making a great deal of a genuine mistake. Thanks
my professor you are the best .
I wasnt having a go but since your name is danscourses I thought you might have some kind of business attached to your RUclips account. If it was me I would have reuploaded but anyways. Your other material seems good and your helping other learn so good job :D
192.168 and 192.1 is already in different network so its impossible to connect the network without routing it first even with right cidr. cmiiw
@mikjet I posted an annotation to let viewers know. Good job on catching that.
I was using the term “Least significant Bit” but magic number is way cooler. Totally lost about the 192.168.1 on one network and 192.1.1 on the other. How one network is subnetted has absolutely nothing to do with how another network is subnetted as far as I can tell. Thanks for enlightening us.
So the last usable host cannot be included as the end number of the range? (that's why you had to change the 47 to a 46, right? because 47 is not included? I know nothing about networks or anything so this is just a video I stumbled upon to make some sense of things. Thanks.
Amazing
i have watched Videos on youtube studied books
but this video gave me the understading of subnets
Thanks Dan you are Great !!!
Nice, this is super clear, unlike some french writers >.>
Good explaination, if you still dont understand the /26 /30 notations you need to let it go and become a gardener
Dude..thanks alot, YOU made it very simple.
The left hand side have a different subnet from the right hand side. I am not satisfied with your answer. But great job
despite few slips this vid was excellent! thx man :)
Very useful video and very easy to understand. Thank you
did see it from the start you made the mistake with 47 - which was the broadcast, so i was curious to see how you can solve the problem ...
pls do u mind explain g where u got 47 to 48 becos the binary is 128,64,32 and 16 so the magic number moves from 0-15,16-31,32-63,64-127,128-239,240-255.
Perfect explanation sir, i really appreciated it..
@danscourses Thanks, I am getting ready to take my CCNA exam soon and enjoy doing these.
I know you are just trying to illustrate something here, but in the example you have 2 routers, but only one of those routers can have the 192.168.1 network, correct?
@pinkylinky4 2n-1, or n-1, 0 is a number u must count it, so 0-63 is really 64 get it?
These ip you used not in same range
Range one 192.168.1.x
Second range 192.1.1.x
Its two default ranges why did you said same range ?!
Great vid. Just curious though how come you skipped /27
After 2 examples that did not work, he just skipped to the next subnet that did work, which was 28.
dan this is you,i have downloaded your ccna level packet tracer sims
thanks, your videos have helped me so much. . keep up the great work!
the first three octet of the two routers are different meaning they are in different network so how can you classify that two different networks into single groups of subnets?
I have a question, if all those subnets use the same subnet mask, how do they get established as a range of hosts that talk amongst themselves? does that happen when you create a VLAN? does a VLAN contain the range of hosts it will be using?
Hi Dave. A VLAN is a layer 2 concept. I will get back to that. When a packet is sourced from a machine, it has a destination address. The routing logic on the sourced machine makes a calulation using the configured subnet mask on the machine. This initial calculation determines one of two things. The packet is destined to a different subnet block or part of the block that the source machine's subnet is on. Because of the subnet mask, the range is established. IP is overlayed on top of layer 2. For IP hosts addressed on the same subnet block to communicate, they must be bound to MAC addresses on the same layer 2 VLAN. VLANS are configured usually via ports. Subnets and VLANS are two seperate concepts.
Im pretty good at maths but this really is hard to grasp, I used to run books for horse racing, most people dont get that, however I found it easy, this takes some getting ones head around.
this explanation is indeed right if you consider having 2 networks then the correct answer is /28 but you wrote "all addresses should start with 192.168.1, i wrote 192.1.1 by accident Thanks to mikjet to point out " on the top of the video, then the answer /26 would be correct.
I know it was 5 months since you posted this comments, but I just had to point it out.
You said "this explanation is indeed right if you consider having 2 networks then the correct answer is /28 but you wrote "all addresses should start with 192.168.1, i wrote 192.1.1 by accident Thanks to mikjet to point out " on the top of the video, then the answer /26 would be correct.".
That is incorrect, because if you have two networks using the same IP addresses there can be problems. Imagine you have PCs with the IP 192.168.1.2 ans 192.168.1.3 on one network. And then you have the same IP addresses on two PCs in the other network.
Now, if you were to ping from 192.168.1.2 to 192.168.1.3, you would only be pinging the PC in your own network. You would never get to the thetwork over on the other side, because the router would not know that you wanted to go there.
ive read so much and watched videos but I still get confused as to why you would have different subnets. Why does it matter what number im using. Surely I can pick any and use that. Can someone please explain.
ok, so i'm confused can you help me? if you have an ip address and the last number is /24 then the network's go up by 1? is that right? cause the LSB is in the 1's place so the first network would be 0-1?
Ive been asked a question :
Are the IPv4 addresses 192.168.1.200 and 192.168.1.24 on the same subnet, both have the same subnet mask of 255.255.255.0.
I thought not as I thought 255.255.255.0 had 2 subnets 0-127 and 127-255 ? ?
Im told they have the same subnet, please help
how do i find the ip addresses of each computer. I have an assignment which asks me to create three networks with each network having 8 computers. How do I calculate the the ip addresses for each computer and router ?
Best one ever!!!! Thanks for that and all clear!
Why do the hosts only go all the way up to 256? Why do we just look at the last 8 bits?
someone was yawning in the back lol That guy must be really tired . ! great video by the way thanks
That was so clear and easy, thanks.
What about the network in between the two routers ???
How do u find magical number for different /25 /26 /28....i have doubt on that
That was an awesome video and a great tip for those taking certs!
Why did you make it 46 when 47 falls under 32-47 ? Is the 47 reserved for something else?
The first address and last address in a range (in this case 32 and 47) are reserved addresses for the network number and broadcast number. Because the device shown is a computer which needs a HOST address to operate, it would not work on the broadcast address. 46 is the top host address in the range which is why it was changed.
Ah k Thanks.
Prior to reading the comments below I understand where Mr. Dan was going with this, provided if we were in the same network of 192.168.1.x. (since we saw 192.1.1.x) Was this an honest "typo" mistake?
Aside from the "typo" I was able to follow along with ease through the walk through provided... Thank you very much +danscourses !
it was a typo
Great tip...
If you cant answer the question....CHANGE THE QUESTION.......
If the first subnet starts at .32 then wouldn't the pc address of .47 be wrong seeing as it's the broadcast address for that subnet?
+ploperator but this can not be used for end user machine it that case
can i apply this to the cisco packet tracer? :3
Thank you very much your explanation very good.
I don't understand how they would all be in the same subnet with options A) and B) when the ip addresses are 192.168 and the 192.1 ?? Could you explain please?
Gemma Marsh mistake they're meant to be both 192.168.1.x
Network structures remind me of space a little bit and different solar systems etc. Anyway I wrote out a flowchart of my network to a T,and even gave then names too. It's not even that big either, the most complicated thing on my network flowchart is the firewall of course with modified rules blocking specific IP addresses most of them located in China and India.