Kim, I'm honestly amazed by you. Every time I don't understand something in particular, be it something about BGP, GRE..anything it is, almost always I'm missing the part that makes me go "That's it! I get it!" - I then search through numbers of books, videos, but I rarely find what I'm looking for. Then I find you!! And you always explain exactly what I've been missing and always deliver it in a way that makes me confident that I do understand a particular subject on a level that I can move on to more advanced stuff. Kim I wish you were making more videos, or had a page or something where we can ping with you more often. Thank you so much for your videos and I'd be so happy if you'd make more!!! High five!
Just spent an hour with my friend trying to reverse engineer this subnetting stuff. And just wanted to say this video is what made it all click. Thanks!
Another Example: Let’s say our address is 10.10.1.99/23 In Binary that becomes 00001010.00001010.00000001.01100011 The network portion is determined by the ones in the subnet mask.So /23 means the network portion is the first 23 bits as is, with the remainder of the bits set to 0 00001010.00001010.00000000.00000000 So 10.10.0.0 it the network address Broadcast address: set those last bits to 1’s instead of 0's (everything after the 23 bits from subnet mask)00001010.00001010.00000001.11111111 So 10.10. 1.255 is the broadcast address 1st available host address - add one to the network adress00001010.00001010.00000000.00000001 So 10.10.0.1 Last available host address - subtract one from the broadcast address00001010.00001010.00000001.11111110 So 10.10.1.254 Range of host address is therefore 10.10.0.1 - 10.10.1.254
good teacher but there`re something is missing "broadcast "keyword is not accurate teriminology instead it`s called "directed broadcast ip address" because "broadcast "keyword by itself is referring to "limited broadcast ip address" and it`s 255.255.255.255 this format 255.255.255.255 is reserved for "limited bc ip addr"or as you say "broadcast" but into your example "10.10.1.255"is called "directed bc ip addr" but if you are already know the difference between these 2-terminologies then it`s ok to say "broadcast" on "10.10.10.255" HTH
Here the address is "10.10.1.99/23". How will I find host, network and broadcast address if I'm not provided with this "/23" mask in the question?? Do I add this subnet mask extension on my own or what? What difference will it make in subnetting if we are provided with an IP address with no subnetting mask extension and we are supposed to determine the network, broadcast and host address? For example last week my teacher gave a subnetting question to find host, network and broadcast address with an IP address "172.16.0.0" with no extension of subnet mask. However in this question, you have clearly used this "/23" Is that any different from when the subnet mask is already given??? Please explain this to me!!
Outstanding video tutorial! I’ve viewed many of these over the years and this one may be the best I’ve seen at presenting information clearly in a short amount of time.
Im about to take my CCENT and I can't thank you enough for this perfect explanation of subnetting, thank you so much Cisco Kim I definitely have to show you to others!
There is like hundreds of videos of this on youtube, one worse than the other. This one I borrow and show on my network 101 training classes. Short and not full of "ops". Thank you! I've also noticed some disturbing comments here. Thank you Kim for contributing to a more equal society. We need more women in the business.
I stumbled across this video while working on a subnet calculator project. of all the subnetting lessons on youtube, this was the most helpful. thank you.
Ahhh now I see. Thanks for the explanation because my professor's notes just weren't doing any justice. Classmates weren't much help either, so thanks a bunch!
Q. What are the subnet mask, first available host address of subnet one (NOT subnet zero), and the maximum number of hosts per subnet for the network below? You need to allow for maximum number of hosts. Also, you can use subnet zero and the all-ones subnet. RFC 1878 Network ID: 161.31.0.0 Subnets Required: 45
Thank you so much for the explanation! This is such an easy method for figuring out Net ID and Broadcast ID! I just couldn't wrap my head around it before watching this video. Thanks again!
You have been away for too long. Please come back. You explained something so complicated in such a simple way. I figured out a network+ question after watching your video.
For a class C as above, the network address wouldn't always be 0, would it? Depending on what the fourth octet is, what if instead of .34/26, it was .124/26? Would the network address still fall to 172.16.5.0? Could you do a video for class A and class B using your technique? Thanks!
Understanding the C language and distinctions between how numbers are represented including how binary is counted and "moves" is important to understand how stuff like this works - why it works the way that it does - and how subnetting works and why its important. Using a subnet is a means to find the NET_ID and HOST_ID of the IPv4 address format represented in decimal against 3 different "standard classes" of addresses. When you see the decimal number "255" that is translated into 11111111 in binary in which the logical AND operator is applied in C to determine where to look for what. She is demonstrating something called variable length subnetting which is a step up that offers flexibility that isn't restricted by byte boundaries, aka the "/8 /16 /24" you see when determining the NET_ID and HOST_ID (IPv4 addresses are 4 bytes or "/32"). In C the char data type's (or byte's) maximum value is 256, which translates to "255" in decimal because we start counting at '0' not '1'. It's always bugged me trying to make sense of what other people said when I was learning about stuff like this because there are multiple layers of abstractions and techniques being discussed. In the case of addressing its bit manipulation and shifting back and forth from decimal to binary. blah blah blah, aight Im out -
This is the BEST break down I've ever had. Thank you so much. I have one question. Where did you get the /26 from? Like where does this number come from?
it's called a CIDR it's derived from how many hosts you need so if you need say 100 hosts you'd take 2^7 (128) subtract 7 from 32 and it would get you your CIDR which would also get you your subnet 11111111.11111111.11111111.10000000
Your video is old but it SAVED my butt I just could not understand it, but your video helped me understand it. Thank you very much. Hope you are doing great in life.
Thank god you do the ones with cidr blocks. So many tutorials that do some really basic subnetting and they all suck because it's so basic... they use the easiest formulas like 255.255.255.0 and in life we know we don't get it that easy. Thank goodness for this video!
A simple explanation makes my life easier. Thanks.
4 роки тому
Hello everyone, Hi Kim.. Just one question. Is it possible to change Default mask - for examle : IP type C (192. 120. 120. 40) Mask: 255.255.255.0 - But when I need more then 253 Hosts, Do I have to change IP to Type B, or can I just change Mask to (for example : 255.255.240.0) ? Or since it is IP type C, I can't change those 255 in mask. X ?
Thank you for helping me to understand this concept! I don not get to meet with my instructors enough to ask questions and google can be a crap shoot... Later! Sub
See ...in the last octet....its all 1's Counting from the end(0th Position) to 5th position...so add all the values from 2^0 + 2^1 .....+2^5....You will get 63...its like dat for all the four octets...whichever bit is 1 , its positional value raised to the power of 2 is added.
This makes much more sense than my 3 hour lecture. Thank you.
Good to hear, you are welcome!
please check out this video
ua-cam.com/video/nC0nfp5wykg/v-deo.html
Same here!!! =)
You got a 3 hour lecture? My prof told us subnetting is a thing and immediately moved on after 5 seconds, now we have an 8 page assignment about it...
@@ciscokim6221 Thanks for the best subnetting video on internet.
I love it how all of us have shit professors hence why we ended up here 😂
The Dark Musket haha haha very very true lol
My professor posted this for us in our blackboard and played it in lecture I guess I got lucky.
Definitely. Atleast I found an entire playlist with 1 episode for each ccna chapter
Absolutely. I don't understand my instructor.
Thanks to corona virus I can’t even have class and the professor just posts documents without any explanation
Kim, I'm honestly amazed by you. Every time I don't understand something in particular, be it something about BGP, GRE..anything it is, almost always I'm missing the part that makes me go "That's it! I get it!" - I then search through numbers of books, videos, but I rarely find what I'm looking for. Then I find you!! And you always explain exactly what I've been missing and always deliver it in a way that makes me confident that I do understand a particular subject on a level that I can move on to more advanced stuff. Kim I wish you were making more videos, or had a page or something where we can ping with you more often. Thank you so much for your videos and I'd be so happy if you'd make more!!! High five!
You just made my day...thank you so much, you're too kind.
You've explained this simply in 4 minutes, better than my lecturers have explained in 3, 1 hour lectures. Thank you 🙏
I totally agree with you!
Uni needs more people like you to teach, with clarity and simplicity...god bless you.
I was totally lost on subletting until I found this video. You made it simple, thank you.
Hay
Hannah right
@@abdulraqeebassdy6537 bhai line mat mar tharki
subnetting*
@@TheDayaan thank you, I didn't want to be the one to say it
Just spent an hour with my friend trying to reverse engineer this subnetting stuff. And just wanted to say this video is what made it all click. Thanks!
Another Example:
Let’s say our address is 10.10.1.99/23
In Binary that becomes
00001010.00001010.00000001.01100011
The network portion is determined by the ones in the subnet mask.So /23 means the network portion is the first 23 bits as is, with the remainder of the bits set to 0
00001010.00001010.00000000.00000000
So 10.10.0.0 it the network address
Broadcast address:
set those last bits to 1’s instead of 0's (everything after the 23 bits from subnet mask)00001010.00001010.00000001.11111111
So 10.10. 1.255 is the broadcast address
1st available host address - add one to the network adress00001010.00001010.00000000.00000001
So 10.10.0.1
Last available host address - subtract one from the broadcast address00001010.00001010.00000001.11111110
So 10.10.1.254
Range of host address is therefore 10.10.0.1 - 10.10.1.254
good teacher
but there`re something is missing
"broadcast "keyword is not accurate teriminology
instead it`s called "directed broadcast ip address"
because "broadcast "keyword by itself is referring to "limited broadcast ip address" and it`s 255.255.255.255
this format 255.255.255.255 is reserved for "limited bc ip addr"or as you say "broadcast" but into your example "10.10.1.255"is called "directed bc ip addr"
but if you are already know the difference between these 2-terminologies then it`s ok to say "broadcast" on "10.10.10.255"
HTH
Thank you for the feedback. To clarify it's the broadcast address of that particular network.
/23 CIDR is of class B, whereas 10.10.1.99 is of class A.
Here the address is "10.10.1.99/23". How will I find host, network and broadcast address if I'm not provided with this "/23" mask in the question?? Do I add this subnet mask extension on my own or what? What difference will it make in subnetting if we are provided with an IP address with no subnetting mask extension and we are supposed to determine the network, broadcast and host address? For example last week my teacher gave a subnetting question to find host, network and broadcast address with an IP address "172.16.0.0" with no extension of subnet mask. However in this question, you have clearly used this "/23" Is that any different from when the subnet mask is already given??? Please explain this to me!!
Hence where VLSM comes in
Very useful, i watched the video one houre before the exam, you saved my day thanks :)
Oh that's so good to hear! Thanks!
Thanks Kim. This is the most logical, easy to understand and simple way I came across in 10 years for subnetting.
Thank you David, I appreciate that.
I'm glad it didn't take you more than 10 years to learn subnetting :P
This video's explaination made me understand this concept which I was trying to get from 2 days...
Thanks for such good explanation
3 YEARS LATER.. and this helped me out. Thanks for keeping this uploaded!
After watching so many videos on sub-netting, I found this technique easy to understand and implement. Thanks.
That's what I was always looking for. A video with an explanation.
Thanks for helping us.
You're welcome, thanks for watching.
You just blew my mind. You summed up A LOT in just a few short minutes. It took other teachers (that I paid for) much longer to explain.
What a simple yet complete way of putting it all together. Thank you, Kim. Respect 👍
Outstanding video tutorial! I’ve viewed many of these over the years and this one may be the best I’ve seen at presenting information clearly in a short amount of time.
Thank you! I appreciate that.
Good morning Kim ! could you please add more content, you are one of the best teachers out there Thanks.
I have been struggling with this concept for a day now. You have made it clear and simple in only four minutes. Thank you! Your a lifesaver!
Thanks you for making this simple video, its so clear. You explain better than the Cisco Website
Thank you so much, that's very kind.
Thank you Kim, this has been just what I needed. Other explanations were too convoluted. It has finally clicked. Thank you Kim
Thank you for making this much simpler to understand!
Thank you I got it, I didn’t understand anything my professor said about this in his 1 hour lecture.
Thanks for watching! I'm glad I could help.
This was SO simple and straightforward to follow. More like this please - you're now my hero
Angela Helvin thank you so much, your words mean a lot.
Im about to take my CCENT and I can't thank you enough for this perfect explanation of subnetting, thank you so much Cisco Kim I definitely have to show you to others!
Thank you so much! And good luck on your exam!
I was litteraly confused in subneting and hosts..
You made it easy
Thank you
Fantastic representation. This'll help majorly, and I actually got the hang of it now.
There is like hundreds of videos of this on youtube, one worse than the other. This one I borrow and show on my network 101 training classes. Short and not full of "ops". Thank you! I've also noticed some disturbing comments here. Thank you Kim for contributing to a more equal society. We need more women in the business.
I'm happy to hear that, thanks, and yes please share.
John Eriksson Stop embarrassing yourself.
Thank you so much!! It's gonna help me in my Exams!! God bless
May this holy month, Ramadan, bring success to your channel. THANK U!
I just learnt more from this than from an hour video I watched a while ago. Thanks a lot.
Wow, you're awesome! I just watched a 2 hour lecture in my school about the same thing that you explained in less than 5 minutes.
I stumbled across this video while working on a subnet calculator project. of all the subnetting lessons on youtube, this was the most helpful. thank you.
You saved my life right before midterms. Thank you!
Thanks a million, was having trouble understanding calculating broadcasting addresses. Much appreciated :)
Ahhh now I see. Thanks for the explanation because my professor's notes just weren't doing any justice. Classmates weren't much help either, so thanks a bunch!
You are welcome, glad I could help!
Q. What are the subnet mask, first available host address of subnet one (NOT subnet zero), and the maximum number of hosts per subnet for the network below?
You need to allow for maximum number of hosts. Also, you can use subnet zero and the all-ones subnet. RFC 1878
Network ID: 161.31.0.0
Subnets Required: 45
Helped me understand subnetting better - I was lost before this one ! Thanks a lot :)
Thank you so much for the explanation! This is such an easy method for figuring out Net ID and Broadcast ID! I just couldn't wrap my head around it before watching this video. Thanks again!
That's great to hear, glad I could help!
Thank you, very informative, short and right to the point!
You have been away for too long. Please come back. You explained something so complicated in such a simple way. I figured out a network+ question after watching your video.
Thanks for being succinct! Super helpful.
Incredibly helpful, thank you!
Fantastically simple explanation. Very helpful. Thank you :-)
Thank you from the bottom of my heart. The entire semester I was struggling and this 4min video makes so much sense. Happy new year, keep it up!
Thank you for your Clear explanation! you saved me for tomorrow's quiz
I really would like to have a teacher like you at school, you make it very simple thank you
ok, so at least one obstacle that I was struggling with is out of the way. Thank you!
For a class C as above, the network address wouldn't always be 0, would it? Depending on what the fourth octet is, what if instead of .34/26, it was .124/26? Would the network address still fall to 172.16.5.0?
Could you do a video for class A and class B using your technique? Thanks!
Short and to the point! Excellent!!!!
This helped me so much thank you
Thanks for the amazing video and explanation. I just couldn't understand my professor, this explanation was quick and easily understandable.
Great content! It’s very refreshing to see a woman that knows networking. There are far too few females in the IT world.
I was a bit confused when i came here. Your video was very clear and spot on. thanks!
You're welcome, happy to help!
This was so helpful! I was able to figure out how to find the network address of an IP in the 1st minute of your video. Thank u so much.
With your explanation , you have made my day 😍☺
thank you dear
I found your videos today while searching for host and subnet calculations and your explaination is perfect
thank you ❤
Thank you so much for your comment. I'm glad you liked them.
I love that you explained this better than my textbook did - I appreciate you for this, thank you!
BRILLIANT! THANKS SO MUCH. I UNDERSTAND IT BETTER THAN MY TUTORS! IM CURRENTLY STUDYING NETWORK TECNOLOGY 3 AT UNIVERSITY RIGHT NOW!
Understanding the C language and distinctions between how numbers are represented including how binary is counted and "moves" is important to understand how stuff like this works - why it works the way that it does - and how subnetting works and why its important. Using a subnet is a means to find the NET_ID and HOST_ID of the IPv4 address format represented in decimal against 3 different "standard classes" of addresses. When you see the decimal number "255" that is translated into 11111111 in binary in which the logical AND operator is applied in C to determine where to look for what. She is demonstrating something called variable length subnetting which is a step up that offers flexibility that isn't restricted by byte boundaries, aka the "/8 /16 /24" you see when determining the NET_ID and HOST_ID (IPv4 addresses are 4 bytes or "/32"). In C the char data type's (or byte's) maximum value is 256, which translates to "255" in decimal because we start counting at '0' not '1'. It's always bugged me trying to make sense of what other people said when I was learning about stuff like this because there are multiple layers of abstractions and techniques being discussed. In the case of addressing its bit manipulation and shifting back and forth from decimal to binary. blah blah blah, aight Im out -
Man thanks for typing out what i have been thinking for years
Wish my lectures were this good. I greatly appreciate this.
Professor Messer: Here's a 20 minute video with this huge ass chart you need to write before the test starts
ciscoKim: lmao here's the smart way
You have explained this much better than my lecturers have. They have not done it well at all. Thanks
This is the BEST break down I've ever had. Thank you so much. I have one question. Where did you get the /26 from? Like where does this number come from?
it's called a CIDR it's derived from how many hosts you need so if you need say 100 hosts you'd take 2^7 (128) subtract 7 from 32 and it would get you your CIDR which would also get you your subnet 11111111.11111111.11111111.10000000
its the subnet. so the sub is 255.255.255.192 or 11111111.11111111.11111111.11000000=26 (1s).
This was very helpful! Thank you!
@ciscoKim how did you get 63 for the broadcast address?
Thank you for this simple explanation. Straight to the point.
Great to hear - thank you!
Spent the last few days going crazy trying to understand this, all clicked when i watched this video
THANK YOU! Finally a simple way of determining the network and broadcast.
Good to hear! You are welcome :)
Thank you ! You made it very simple and understandable for a beginner !
great.. I understand it really clear now.
could you do one with custom subnetting where you have to divide the network into more than one.
you explained in 4:22 mins what took my teacher over 30mins to go over, thank you !
You're welcome :)
Your video is old but it SAVED my butt I just could not understand it, but your video helped me understand it. Thank you very much. Hope you are doing great in life.
Hi I'm in my last year of a-levels in the UK, thanks for this information very useful because I'm going into cyber security field.
Thank god you do the ones with cidr blocks. So many tutorials that do some really basic subnetting and they all suck because it's so basic... they use the easiest formulas like 255.255.255.0 and in life we know we don't get it that easy. Thank goodness for this video!
THANK YOU FOR MAKING ME UNDERSTANDING IP ADDRESSING EASIER! THANK U SO MUCH
Lucas Tant you are very welcome, I'm glad I could help.
Great tutorial. Good explanation, examples and you even kept it short! :-) Great work.
Thank you so much, I appreciate it.
Thanks straight to the point and easy to understand in simple language and less than 5 mins! Wow. Thanks
Very well explained, thank you!
Thanks for watching (and commenting)!
Thanks so much for the simplicity. You made my day.
It took me 12 fucking hours to understand what you explained in less then 5 minutes. I almost gave up. THANK YOU SO MUCH!!!!!!!!!!!!!!!!!!!
A simple explanation makes my life easier. Thanks.
Hello everyone, Hi Kim.. Just one question. Is it possible to change Default mask - for examle : IP type C (192. 120. 120. 40) Mask: 255.255.255.0 - But when I need more then 253 Hosts, Do I have to change IP to Type B, or can I just change Mask to (for example : 255.255.240.0) ? Or since it is IP type C, I can't change those 255 in mask. X ?
I really appreciate your efforts! I completely understood this topic now.
This just helped me so much. THANK YOU KIM!
Easiest and fastest example I've seen; thank you
Thank you! That's exactly what I was going for.
falling in love with your way you are expressing such a difficult topic in a very easy way.....
thank you very much Kim you taught such a logical thing in just 4 min.
Thanks a lot!!!!
You're welcome! Thanks for watching.
Very good tutorial I love it! I wonder what if there's 3 subnets needed, how to solve it?
Absolutely perfect. Clear and short.
Way better than any uni lecture I've ever been in
thanks you've made it very clear, could you do a video on data structures programming? if you have experience in that field. Thanks
i was having trouble to understand this topic until i found your video , thank you much
I'm glad I could help, you are welcome.
Very good video! You definitely made it a lot easier to understand!
Nice explanation. Very Clear, short and concise.
Thank you, I appreciate that.
You literally rocked. Thank you for a great clear explanation.
this works on all 3 classes or just the class B?
Thank you for helping me to understand this concept! I don not get to meet with my instructors enough to ask questions and google can be a crap shoot...
Later!
Sub
good video but any clarity on 2:54, how does that equate to 63, is there a formula how did you get the 63 figure ??
See ...in the last octet....its all 1's Counting from the end(0th Position) to 5th position...so add all the values from 2^0 + 2^1 .....+2^5....You will get 63...its like dat for all the four octets...whichever bit is 1 , its positional value raised to the power of 2 is added.
@@aashikashok it should be 77 and not 63.!!
@@hassanallali894 Yeah, I do not see how thats possible. In binary 111111 = 63. Or as Aashik stated (broken down) 1 + 2 + 4 + 8 + 16 + 32 = 63
Simple and easy explanation. Hats off to you miss
Thanks!
This video saved my ass before a networking exam. Thank you!