Subnetting Cisco CCNA -Part 1 The Magic Number

[@kaijunior4339]

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!!

[@rmachayes]

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!!

[@KabisNest]

This guy must be awarded for explain subnetting. never seen a tutorial like this. thanks a lot dear.

[@mohamedzubiar7045]

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

[@TerryRed]

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!

[@bollemuslol]

noob

[@danscourses]

@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.

[@davepetter7855]

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

[@siddheshjadhav]

entire Lecture series is awesome and thanks for Great teaching networking

[@danscourses]

siddhesh jadhav Thank you Siddhesh!

[@siddheshjadhav]

respected sir , I really found all your video worth and now i successfully solve subnetting problem. Thanks ones again

[@RonaArts477]

14 years ago, and I just found this! ❤ I finally understand how subnitting works.

[@CristinaReynoso-b4d]

I had such a hard time understanding this until I watched this video. Thank you so much

[@tinkerbot3609]

Nonody noticed third octet is lack of 1 bit?

[@jessicaedens5170]

+Tinker Bot all those 1's and 0's as a distractor lol

[@BigGollum1]

+Tinker Bot Yeha, it only has 7 ones and should be 8, but same result.

[@chad55009]

+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.

[@tinkerbot3609]

+Chad Johnson Yeah i guess this will test who is paying attention :D

[@1DJLNR]

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.

[@prof.newton2568]

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.

[@ManguPapi]

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. 👍🏼

[@franklincerpico7702]

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.

[@LWD-Hidden-Links]

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.

[@tramellmalone9146]

Yes, Love your courses. I have never seen anyone explain subnetting so clearly. I love all your courses. Great job!! Keep'em coming!!

[@0brycefury]

True!! Funfact:I have never seen anyone explaining while using Internet Explorer! LoL

[@mukhtaarabdisheekh8136]

Well done sir. Easy way to understand Subnetting as well as CCNA. Big respect for you!

[@Mazloum1000]

Great video to refresh my subnetting before my lab exam on monday, thank you!

[@neilecolango3639]

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.

[@zsahe21]

I cannot believe it. Now I understand numbers in bit notation! Thank you!

[@o.i2605]

Its 2022 and im so thankful for this video, thank you so much for helping even though 13 years have passed.

[@reggie473]

Excellent video. Very well explained.....it really helped me how to find the network IP address the router has to connect to.

[@shakerHeightsChannel]

The fact that the audio is not synced makes this confusing.

[@andrewfox7116]

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

[@brierepooc8987]

He just missed a 1, that's all.

[@andrewfox7116]

@@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.

[@5k_addy]

I've been searching on KZbin 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?

[@KamrulIslam-sz9eb]

the /24 is called the CIDR notation right? when you add up all the 1s?

[@Nzslavic]

correct

[@Xennox2]

@@Nzslavic Hello:)

[@Nzslavic]

@@Xennox2 hi

[@chirpingbluebird]

the best video.. this is the fundamental for anything in administration.. once this is mastered, then anything looks easy.

[@musicalokaoficial]

Great vid man , I’m in to Cisco now and I have better understanding with you then my actual tutor 🙈😬

[@ThePrado361]

where do you get the list of numbers that are underlined?

[@souradeepsengupta4269]

small, precise, clear, awesome. thank you, sir.

[@Popularguy74]

Can the truth table be used with any Class of IP address? This made finding the network ID soooo much easier

[@danscourses]

thanks... yes but the point is that you caught it. I was just testing you ... good job. :)

[@fortunespirit]

SERIOUSLY MAN? TESTING US? ☺☻ (0)(0)

[@jeylful]

Hi, thanks for the time to make this video. It is interesting to know what do the router actually uses the values for.

[@RetroSmoo]

Nice video but the voice being faster than the video is annoying haha

[@uroslazic9976]

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!

[@dfaro4582]

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.

[@jestbadzjt]

Do you have another video for class a and b subnetting?

[@jezzpopp]

your video rocks! helped me out when i had no clue

[@ghasanazeza2936]

i'm just watching this video. Thanks for explaining

[@Sid300481]

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.

[@bforever9039]

A mistake is at 4:28. One zero is missing in the third octet, there are 5 of them instead of 6. 3=00000011

[@Kanjiidesu]

why is it only 7 1's in the 3rd octet?

[@ShuyanStoryTeller]

I haven't gotten why at last 24 turns to 28. May you teach me?

[@valerieenglish2869]

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

[@jordanbell3903]

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.

[@idontcarestfu]

Newb question, but why does the .55 amount to 0? When subnetting, do you default to the last octet of the subnet mask??

[@invisibletenants]

Shouldn't the third octet have 8 digits?

[@CyrusTheGigagchad]

Yeah.

[@EmilValiyev1]

How can we define magic number in that mask 255.255.128.0 ip : 172.16.0.25

[@shitang4400]

Nice video....The voice are clear to understand

[@elvin33321]

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?

[@kwan899]

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

[@Haroldm814]

I'm sure you know by now but you add the 128 through 1 and it comes out to be 255

[@ChurchNewCreation]

is there websites that i could go to practice the subnet things you have taught me ??? plz help

[@polipatt6136]

Best explanation out there. Thank you Sir.👍

[@mr.hackers140]

how can i find the delta and borrowed bits of this ip 200.220.20.0 /24

[@Handalumaban]

Your courses are great. Clearly explained, well documented and you really helped take out the cobwebs on this topic. PROPS to you, and thanks.

[@Frank44060]

Is the video lagged from the audio?

[@danking9879]

11 years later, still learning

[@BeeBumper]

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

[@ChillinDylan]

So you title this The Magin Number, but don't actually talk about it here?

[@benjostoked]

dan, you are doing a good job!

[@brianm9463]

Very good tutorial.....using an internet explorer gives you sir a +1 bonus

[@sunny19886]

@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

[@tabk3992]

Thank you it makes sense when you explain it!

[@foxfox9587]

but where did u get the 24? u just wrote 24, so did it appear?

[@hermez2004]

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

[@philipprenner6619]

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?

[@alfredcaver4921]

thank you Dan, you have the best videos for subnetting; and your packet tracer videos are effective also. Dan for President!!!!!!!

[@danscourses]

Alfred Caver Many thanks Alfred!

[@afoslife6641]

Thank you!!!!!! Most simplified way I've seen !!!!!!!

[@hamidaisaiah6047]

Great tutorial and very helpful. Thank you.

[@Slotty_Botfast]

Dan do you have any docs on this method?

[@captainprototype187]

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 .

[@Montecm89]

You sir, are frickin' brilliant.

[@NassimDhaher]

so a like and a subscribe because of a good video more than a decade old.

[@BigGollum1]

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 !!

[@JohnSmith-kv8dx]

/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

[@know_how5661]

@@JohnSmith-kv8dx thank you for the explanation

[@JohnSmith-kv8dx]

@@know_how5661 You're welcome, glad to have helped..

[@network-nub6687]

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

[@mikheiltsikaridze6074]

Your videos are just awesome

[@Slotty_Botfast]

Which app would the be specifically?

[@jcashisme]

Excellent explanation. Thank you

[@TortureTestMagazine]

This made it all click. Thanks so much

[@danscourses]

Hello is spelled with an "e" how could you miss that?

[@mfahad9767]

This actually helped a lot

[@Midnight_187]

Subscribed! thanks Danscourses

[@qzorn4440]

excellent, finally some real information. thanks.

[@LMBC6Brian]

Awesome video. I understand now.

[@hjoseph777]

Good clear explanations !!

[@gatewayacademy3423]

5:10 at octet 3 the octets are not 8 bits they are 7 the ip address and the subnet mask check them

[@mattjoe67]

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.

[@asadmunir1921]

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

[@Runner3772]

As infuriating as the audio lag can be I can't stay mad at it when it is teaching me how to calculate subnets when I don't have a damn clue how to!

[@jessebaldwin1913]

just out there but could you show some 1 over 32 in your I'm more of a mechanic

[@tarunchopra3739]

Hello sir, I think you are missing one 1 in third Octet

[@hcatanzaro]

Thank you! I prefer subnetting with binary! Great video!

[@schioncalzanzi2019]

Dude your third octet has only 7 values instead of eight at the bottom bro, which means it adds up to NOT be 3 but perhaps 4 and the 2 value which equals 6. The math is a bit off 10101000 equals 164 yes? not 168. please redo the video the right way but thank you for even having the courage to make the video because I couldn't do it.

[@danscourses]

You are correct, it is my mistake as many commenters have pointed out. Still good job catching that! I was just testing you. lol

[@schioncalzanzi2019]

@@danscourses how clever man you got me!!! omg. however, you still had the heart to make a channel about it which says a lot. character and confidence. continue. How to configure IpV6 perhaps.

[@Sapien_bix]

great tutorial Sir

[@kidshaw]

great tutorial! subscribed

[@aynm.5496]

how come it became /28?

[@Semphortune]

I think he just took a random example. He could've said /29 or /27 or another random number.

[@BK4YN_HC_GUERILLA]

No he did not say just any random number the reason for 28 is that the 28 bit represent network and are of value 1 and 4 bits of value 0 are for the host portion of the address

[@idontcarestfu]

goaspiritoflove confusing.....

[@aedemirkan]

@ izleyebilirsiniz. İzlediğiniz için teşekkürler :)

[@ojeshsharma13]

such a nice lesson

[@xXxBladeStormxXx]

What's the point of subnet masks?

[@stefarrell7989]

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

[@holycow1001001]

please try to redo this without the ah and uhms, right

[@souvikchakraborty763]

Numbered position should be ended with t'h (eight'h)..How could you miss that?

[@aanish27]

im from 2023 and you?

[@Jozayver]

2024😂

[@miraclemulipola9537]

I'm from my mum

[@kristiyanivanov7414]

Thank you for making this.

[@depotsportsfamily]

A great way to start CCNA course. Thank you. :D