As a retired educator, historian, electronics technician, TV studio technician, blah, blah, blah, I have taught many students both in analog as well as digital. So, that gives me a little authority to throw some criticism your way, BUT, there is no criticism to throw your way. Seriously, you have developed an outstanding method of teaching a very difficult concept as we all have found out. Great job!!
By far the best tutorial and I have watched a professor messer and others and they were not as half as easy explained. This is 10/10 highly recommended. Bravo buddy
u came here to learn or point out mistakes(for who r commenting)...sir i am a beginner in ccna classes in india and your making it very easy for me.i spend too much time in subnetting but ur brilliant...thank u
I watched this video last semester while taking an Intro to Network Administration class. A big chunk of the class dropped after the first test because they were so confused by subnetting. Now I had a decent understanding of the concept, enough to pass the exam, but after seeing your magic number explanation I breezed trough subnetting like a boss. In fact, I spoke with a classmate who's taking the CCNA 2 class at the moment and I asked him what the most difficult part was for him; the answer, subnetting. I took out a sheet of paper and showed him what you say in the video and it was like a light bulb came on. He had been under the impression that you had to just memorize all the different sizes and host/broadcast address.
Wth man, you really tricked my mind into learning this quickly lol. I guess it's true when everyone says to watch different instructors. Thank you good sir. 👍🏼
Wow… after reading from a lots of articles and youtube references… Your explanation and calculation makes a lot of sense and easy to ‘logically’ understand… Thanks Dan.
+Tinker Bot I have my paper and pen out and noticed the same thing!!! I thought i was losing my mind as this is my 2nd video ever on subnetting :) Thanks for pointing it out too! It's easy to mistake with so many 0's.
Tinker Bot get a book. These videos are for people who already know things from reading books, you cannot learn something from scratch off youtube unless you have read a great amount of books on any said subject.
I did CCNA but subnetting class i missed which i got disappointed, u explained well and iwatched so many videos but i didnt understood it proberly. Thanks well dude now i am familiar with subnetting.
I am an electronics tech in the canadian military.I am in the middle of my data comms course, and was lost on subnetting and routes, but your videos saved me!
@ybrody You are welcome. A supernet if similar to a summary route. Search for summary routes and you will find a few videos that I have posted. You can also check in my CCNA 1and 2 playlists.
wow. weeks of staring at the numbers laid out on paper, I didn't realise it was ANDING with the line underneath, I've been writing it all side by side and wondering how people decide what's true and what's false, I thought you all had some fundamental knowledge I've somehow missed my whole career. Thanks! Probably not my first comment on this vid, I'm learning a lot from it.
Hey man, i really feel the need to thank you, i watch one vid from you and i understand faster then what my professor could teach me in three god damn hours. You are a saint!
URLs Lazic dude I'm in college right now and I got a professor who has the knowledge but his English is very poor. this video help me a lot to subnet easy.
I've been searching on TH-cam for hours and your video is the closet to answering my question, but it doesn't quite answer it. How are you getting 240 at the end of the subnet mask for /28?
Excellent video. Easy to follow. Please explain the number "255". How did you arrive at that number. I listened to your video over again, and still didn't hear the explanation. Thanks
255 is from the binary conversion and is the highest possible number in an octet. Seeing 255 means that when converted to binary, every digit in the octet is "on" or "all 1's". There are 8 digits in each octet divided into "places" but instead of tens, hundreds, thousands, etc that you know from the Base 10 numbering system that most of the world uses for everything, the places for subnetting are "128 192 224 240 248 252 254 255". Also 128+64+32+16+8+4+2+1 = 255. Writing these 2 sets of numbers on top of each other can be a good "formula/cheat sheet" to write at the top of every scratch paper that you use for IPv4 subnetting. This video isn't very clear and doesn't get into that so I don't want to get too off topic, but if you want to learn subnetting or anything with networking in general, I would suggest watching Keith Barker's videos or subscribing to CBT Nuggets to get the best ones.
Not sure if this is a stupid question but I am a newbie and I am wondering how or where did he get the numbers 255.255.255.0 from 24? Did he do any calculations to get those numbers?
great tutorial.. all the while i was trying to figure out /28 and books explained so confusing when all they had to say was its the number of "1"s in binary lol! only down side of ur video is the sound and video dont sync... sound is delayed
Hi can you do a tutorial on valid ip range and calculating blocksize hats down to your tutorial...Doesn't an IP with the bits of 24 have a block size?? and y? Regards
The easiest wording for inexperienced "Anding" is for the output to be 1 all inputs must be 1. ANY 0's outputs a 0. (True=1 // False=0) . Just keep in mind 255 in the SNM, means that octet doesn't change after ANDing
Ok, finally a clear start in binary counting. So you need the 128 - 1 table as a guide for that... AND then its all about counting the inside of the buckets .
I am very frustrated with subnetting, for some reason I do not get It, any body with suggestion or help,I watched many tutorial nothing helps me, thank you.
/24 refers to there being 3 octets to the subnet mask or 24 bits reading from left to right. /20 would therefore be 11111111.11111111.11110000.00000000 in decimal this subnet mask would be 255.255.240.0, /21 would be 255.255.248.0 and /15 would be 255.254.0.0
Good work mate. Thanks for sharing. To all whingers: you're learning some here (and for FREE), at least respect it. If can't put any constructive comment then at least don't post silly comments for silly errors.
demolicious It does matter that the 3rd octet is missing ALL 8 bits, if you were to convert the binary subnet to decimal it would equal 255.255.127.0, if you use his method to convert the octets to decimal you'll see this
No it isn't because if you make a mistake you won't be able to work it out unless someone shows you the solution. You need to understand the binary or you simply have no fucking clue what's going on.
The point is if you happen to need to split the networks. Im just learning to But search "subnet masking eli the computer guy". He has tonnes of videos and hes quite clear to. not saying he knows everything but you will find useful info on many channels rather than 1 channel
Because of Dancourses, I can understand subnetting very clearly and other hard configurations. I just passed my ccna today, a big Thank you to Dan!!
As a retired educator, historian, electronics technician, TV studio technician, blah, blah, blah, I have taught many students both in analog as well as digital. So, that gives me a little authority to throw some criticism your way, BUT, there is no criticism to throw your way. Seriously, you have developed an outstanding method of teaching a very difficult concept as we all have found out.
Great job!!
This guy must be awarded for explain subnetting. never seen a tutorial like this. thanks a lot dear.
By far the best tutorial and I have watched a professor messer and others and they were not as half as easy explained. This is 10/10 highly recommended. Bravo buddy
entire Lecture series is awesome and thanks for Great teaching networking
siddhesh jadhav Thank you Siddhesh!
respected sir , I really found all your video worth and now i successfully solve subnetting problem. Thanks ones again
14 years ago, and I just found this! ❤ I finally understand how subnitting works.
Yes, Love your courses. I have never seen anyone explain subnetting so clearly. I love all your courses. Great job!! Keep'em coming!!
True!!
Funfact:I have never seen anyone explaining while using Internet Explorer! LoL
Well done sir. Easy way to understand Subnetting as well as CCNA. Big respect for you!
u came here to learn or point out mistakes(for who r commenting)...sir i am a beginner in ccna classes in india and your making it very easy for me.i spend too much time in subnetting but ur brilliant...thank u
I watched this video last semester while taking an Intro to Network Administration class. A big chunk of the class dropped after the first test because they were so confused by subnetting. Now I had a decent understanding of the concept, enough to pass the exam, but after seeing your magic number explanation I breezed trough subnetting like a boss.
In fact, I spoke with a classmate who's taking the CCNA 2 class at the moment and I asked him what the most difficult part was for him; the answer, subnetting. I took out a sheet of paper and showed him what you say in the video and it was like a light bulb came on. He had been under the impression that you had to just memorize all the different sizes and host/broadcast address.
I had such a hard time understanding this until I watched this video. Thank you so much
Wth man, you really tricked my mind into learning this quickly lol. I guess it's true when everyone says to watch different instructors. Thank you good sir. 👍🏼
Wow… after reading from a lots of articles and youtube references… Your explanation and calculation makes a lot of sense and easy to ‘logically’ understand… Thanks Dan.
Nonody noticed third octet is lack of 1 bit?
+Tinker Bot all those 1's and 0's as a distractor lol
+Tinker Bot Yeha, it only has 7 ones and should be 8, but same result.
+Tinker Bot I have my paper and pen out and noticed the same thing!!! I thought i was losing my mind as this is my 2nd video ever on subnetting :) Thanks for pointing it out too! It's easy to mistake with so many 0's.
+Chad Johnson Yeah i guess this will test who is paying attention :D
Tinker Bot get a book. These videos are for people who already know things from reading books, you cannot learn something from scratch off youtube unless you have read a great amount of books on any said subject.
I did CCNA but subnetting class i missed which i got disappointed, u explained well and iwatched so many videos but i didnt understood it proberly. Thanks well dude now i am familiar with subnetting.
I am an electronics tech in the canadian military.I am in the middle of my data comms course, and was lost on subnetting and routes, but your videos saved me!
noob
@ybrody You are welcome. A supernet if similar to a summary route. Search for summary routes and you will find a few videos that I have posted. You can also check in my CCNA 1and 2 playlists.
Great video to refresh my subnetting before my lab exam on monday, thank you!
Its 2022 and im so thankful for this video, thank you so much for helping even though 13 years have passed.
wow. weeks of staring at the numbers laid out on paper, I didn't realise it was ANDING with the line underneath, I've been writing it all side by side and wondering how people decide what's true and what's false, I thought you all had some fundamental knowledge I've somehow missed my whole career. Thanks! Probably not my first comment on this vid, I'm learning a lot from it.
I cannot believe it. Now I understand numbers in bit notation! Thank you!
Your courses are great. Clearly explained, well documented and you really helped take out the cobwebs on this topic. PROPS to you, and thanks.
Hey man, i really feel the need to thank you, i watch one vid from you and i understand faster then what my professor could teach me in three god damn hours. You are a saint!
URLs Lazic dude I'm in college right now and I got a professor who has the knowledge but his English is very poor. this video help me a lot to subnet easy.
Great vid man , I’m in to Cisco now and I have better understanding with you then my actual tutor 🙈😬
I've been searching on TH-cam for hours and your video is the closet to answering my question, but it doesn't quite answer it. How are you getting 240 at the end of the subnet mask for /28?
the best video.. this is the fundamental for anything in administration.. once this is mastered, then anything looks easy.
Excellent video. Very well explained.....it really helped me how to find the network IP address the router has to connect to.
This may seem old, but I was curious why the third octet for the IP and Subnet are only 7 bits ? or am I missing something
He just missed a 1, that's all.
@@brierepooc8987 😁 it felt like a thread necro at first but I was like ok he states it but no one else commented. Just covering my bases.
Best explanation out there. Thank you Sir.👍
the /24 is called the CIDR notation right? when you add up all the 1s?
correct
@@Nzslavic Hello:)
@@Xennox2 hi
Can the truth table be used with any Class of IP address? This made finding the network ID soooo much easier
where do you get the list of numbers that are underlined?
Shouldn't the third octet have 8 digits?
Yeah.
A mistake is at 4:28. One zero is missing in the third octet, there are 5 of them instead of 6. 3=00000011
thank you Dan, you have the best videos for subnetting; and your packet tracer videos are effective also. Dan for President!!!!!!!
Alfred Caver Many thanks Alfred!
small, precise, clear, awesome.
thank you, sir.
i'm just watching this video. Thanks for explaining
Newb question, but why does the .55 amount to 0? When subnetting, do you default to the last octet of the subnet mask??
why is it only 7 1's in the 3rd octet?
@0.57 why did you make 55 a 0 subnet mask? If 55 was 0 then I get it...should be 0 subnet but not sure
The fact that the audio is not synced makes this confusing.
Nice video....The voice are clear to understand
Is the video lagged from the audio?
Excellent video. Easy to follow. Please explain the number "255". How did you arrive at that number. I listened to your video over again, and still didn't hear the explanation. Thanks
255 is from the binary conversion and is the highest possible number in an octet. Seeing 255 means that when converted to binary, every digit in the octet is "on" or "all 1's". There are 8 digits in each octet divided into "places" but instead of tens, hundreds, thousands, etc that you know from the Base 10 numbering system that most of the world uses for everything, the places for subnetting are "128 192 224 240 248 252 254 255". Also 128+64+32+16+8+4+2+1 = 255. Writing these 2 sets of numbers on top of each other can be a good "formula/cheat sheet" to write at the top of every scratch paper that you use for IPv4 subnetting. This video isn't very clear and doesn't get into that so I don't want to get too off topic, but if you want to learn subnetting or anything with networking in general, I would suggest watching Keith Barker's videos or subscribing to CBT Nuggets to get the best ones.
Nice video but the voice being faster than the video is annoying haha
but where did u get the 24? u just wrote 24, so did it appear?
Do you have another video for class a and b subnetting?
Not sure if this is a stupid question but I am a newbie and I am wondering how or where did he get the numbers 255.255.255.0 from 24? Did he do any calculations to get those numbers?
24 stands for how many the '1' on the binary form. so you get the 11111111.11111111.11111111.00000000 and thats the same to 255.255.255.0
I'm sure you know by now but you add the 128 through 1 and it comes out to be 255
Thank you!!!!!! Most simplified way I've seen !!!!!!!
Great tutorial and very helpful. Thank you.
Hi, thanks for the time to make this video. It is interesting to know what do the router actually uses the values for.
your video rocks! helped me out when i had no clue
Thank you it makes sense when you explain it!
Hi,
Am I allowed to include this series in one of my playlists and use it? Or even more, allowed to tanslate it to upload it on my channel?
is there websites that i could go to practice the subnet things you have taught me ???
plz help
how can i find the delta and borrowed bits of this ip 200.220.20.0 /24
So you title this The Magin Number, but don't actually talk about it here?
I haven't gotten why at last 24 turns to 28. May you teach me?
excellent, finally some real information. thanks.
thanks... yes but the point is that you caught it. I was just testing you ... good job. :)
SERIOUSLY MAN? TESTING US? ☺☻ (0)(0)
great tutorial.. all the while i was trying to figure out /28 and books explained so confusing when all they had to say was its the number of "1"s in binary lol! only down side of ur video is the sound and video dont sync... sound is delayed
Hi can you do a tutorial on valid ip range and calculating blocksize hats down to your tutorial...Doesn't an IP with the bits of 24 have a block size?? and y?
Regards
Very good tutorial.....using an internet explorer gives you sir a +1 bonus
The easiest wording for inexperienced "Anding" is for the output to be 1 all inputs must be 1. ANY 0's outputs a 0. (True=1 // False=0) . Just keep in mind 255 in the SNM, means that octet doesn't change after ANDing
5:10 at octet 3 the octets are not 8 bits they are 7 the ip address and the subnet mask check them
11 years later, still learning
How can we define magic number in that mask 255.255.128.0 ip : 172.16.0.25
Ok, finally a clear start in binary counting. So you need the 128 - 1 table as a guide for that...
AND then its all about counting the inside of the buckets .
dan, you are doing a good job!
Your videos are just awesome
I am very frustrated with subnetting, for some reason I do not get It, any body with suggestion or help,I watched many tutorial nothing helps me, thank you.
I think this video is the simplest and easiest way to do so try understanding this video hope it helps.
Also i guess I'm late
Thank you! I prefer subnetting with binary! Great video!
A great way to start CCNA course. Thank you. :D
You sir, are frickin' brilliant.
Awesome video. I understand now.
All are masters explaining /24 mask subneeting, but what about /20, / 21, /15, I have looking videos for those ones and I have not found any !!
/24 refers to there being 3 octets to the subnet mask or 24 bits reading from left to right. /20 would therefore be 11111111.11111111.11110000.00000000 in decimal this subnet mask would be 255.255.240.0, /21 would be 255.255.248.0 and /15 would be 255.254.0.0
@@JohnSmith-kv8dx thank you for the explanation
@@know_how5661 You're welcome, glad to have helped..
Subscribed! thanks Danscourses
Excellent explanation. Thank you
This actually helped a lot
Dan do you have any docs on this method?
Hello sir, I think you are missing one 1 in third Octet
Good clear explanations !!
just out there but could you show some 1 over 32 in your I'm more of a mechanic
please try to redo this without the ah and uhms, right
This made it all click. Thanks so much
Hello is spelled with an "e" how could you miss that?
Which app would the be specifically?
so a like and a subscribe because of a good video more than a decade old.
Very good video, thanks for the explaination.
so far so good thank you bro
such a nice lesson
Thank you for making this.
Good work mate. Thanks for sharing.
To all whingers: you're learning some here (and for FREE), at least respect it. If can't put any constructive comment then at least don't post silly comments for silly errors.
Numbered position should be ended with t'h (eight'h)..How could you miss that?
Thanks for the vid. Quite clear.
Though I can't figure out why people care that the 3rd octet is missing a 1...
demolicious It does matter that the 3rd octet is missing ALL 8 bits, if you were to convert the binary subnet to decimal it would equal 255.255.127.0, if you use his method to convert the octets to decimal you'll see this
that was really helpful !!! thnx a ton fr the tutorial!
great tutorial Sir
great tutorial! subscribed
The best way to teach is to state the problem, then implement the solution and explain why it works. The old ways of teaching is not working.
This is exactly what needs to happen, implement this in to a job and teach us instead of straight binary.
No it isn't because if you make a mistake you won't be able to work it out unless someone shows you the solution. You need to understand the binary or you simply have no fucking clue what's going on.
What's the point of subnet masks?
The point is if you happen to need to split the networks. Im just learning to But search "subnet masking eli the computer guy". He has tonnes of videos and hes quite clear to. not saying he knows everything but you will find useful info on many channels rather than 1 channel