Mother of god, I wish this had been explained so simply to me the first time. Every video I've seen has overcomplicated this so much, this is clear concise, and replicable on the exam. Professor Messer is the CompTIA exam Messiah
a whole 2 month in a private vocational school we got the subject of Networking and I find this on the internet after 30 minutes I got the idea of how Subnetting works. I cant thank you enough
Thank you! I was so overloaded by subnetting that I ALMOST quit… it was so completely easy that I just couldn’t wrap my head around it. I stayed in school for 13 hours and finally bam 💥 it clicked! Thank you for you in-depth video.
bin trying to understand this for far longer than it should of taken through books and other resources everything just click at 6:26 awesome tutorial I didn't think id ever understand it thanks to you it all makes sense now
What would be the purpose of say starting with a Class A subnet but using classless addressing to shrink the amount of hosts to that of a Class C subnet as shown in 3:30 in real world application?
As you decrease the number of available hosts on a subnet, you increase the number of available subnets. Instead of a single subnet with millions of possible hosts, you can have thousands of subnets with hundreds of hosts on each subnet.
I think you're thinking of it backwards. You don't get the CIDR notation (the /26) until after you've actually created the subnet. You wouldn't realistically be in a situation where you wouldn't know that it's /26 because /26 is just an easy way to notate that you're using the first 2 bits of the last octet as subnet bits.
@@ChaosMonkeyPlays It just means that you're stealing bits from the last octet, so instead of leaving the last 8 alone for the hosts, you're snatching the first two bits from that octet and using those as your subnet bits.
Since we're in a time where you can test at home, with no calculator OR scratch piece of paper, I have no idea how I'm going to do this in my head AND not mumble to myself. This will be interesting.
@@codygosney976 No, not yet anway. I didn't need the whiteboard when taking the A+ and I've only just begun studying for the Net+. May just sit the exam in a test centre tbh!
After action report: I took the exam and passed. Ended up scheduling it at a testing center so I wouldn't run into this silly white board issue. It turned out I didn't even need it for the exam, there was only one subnetting question and I was able to quickly solve it from available choices and deduction. They do still provide the whiteboard if you end up with a version of the exam with more subnetting questions.
I think I'm missing something basic here... I understand the principle and the formulas make perfect sense but I'm struggling with how you would know what the value of the subnet mask would actually be for a VLSM that you choose to use. Any help would be appreciated :)
Not sure if you figured out what you were asking but if not check out his earlier video of the playlist on IPv4 subnet masks: ua-cam.com/video/L3dsWxn5RBU/v-deo.html I think you'll find in there what you're asking.
I'm a little confused. Is it even possible to have a 172.16.55.0/21 network? If you look at the third octet, 55 would be 00110111 in binary. If your subnet bits only use the first five bits in the third octet (11111000) you wouldn't be able to have the number 55. I know I'm overthinking this, and I understand that this isn't the point of this lesson; however, I just wanted to know I was thinking about this correctly.
Mother of god, I wish this had been explained so simply to me the first time. Every video I've seen has overcomplicated this so much, this is clear concise, and replicable on the exam. Professor Messer is the CompTIA exam Messiah
Learned more things here in 9 minutes than an entire semester being taught. Thank you professor
a whole 2 month in a private vocational school we got the subject of Networking and I find this on the internet after 30 minutes I got the idea of how Subnetting works. I cant thank you enough
Thank you! I was so overloaded by subnetting that I ALMOST quit… it was so completely easy that I just couldn’t wrap my head around it. I stayed in school for 13 hours and finally bam 💥 it clicked! Thank you for you in-depth video.
I have struggled for years to make sense of this.. always giving up along the way.. this video has helped me jump over that hurdle. Thank You!
Nobody explains this like you do Prof. Messer. Thanks a lot.
Professor Messer, thank you very much for explaining things in a way that even someone as brainless as me can fully understand.
That’s me right now as my n10-007 exam is today in 1hr
@@DjJ785 How did you end up doing on it? Mine is in a week.
now I learned what is classful and classless subnetting after watching your video. Thank you so much Professor for uploading these great videos.
Thank you so much for making subnetting, my weakest part of networking, much easier to understand! You are the best!
I passed my A+ core 1 and 2 because of you and this video just made me finally get the math on subnetting. Thanks mang.
Thank you professor Messer, I was getting so confused before i happen to fall upon these easy to use formulas.
The comments made me feel i could understand it and yes i did, i was getting confused from other videos. Thanks prof
Thank you Professor Messer, your content helps so many of us! Quality!!!
bin trying to understand this for far longer than it should of taken through books and other resources everything just click at 6:26 awesome tutorial I didn't think id ever understand it thanks to you it all makes sense now
well done, i am really okay now with IP sub-netting. God bless you Prof. .
This is very easy to soak-in. Thanks for the video
This will help me pass the Network+. Thanks.
Just like that it CLICKED! Thanks Prof Messer.
You are a Great Professor. My confusion went away🎉
I subscribed this channel Nowww
This is so much more clearer than my professor.
Thank you Professor Messer!
Professor Messer is the best!!!!!!
You are right.
what a fantastic video. You have my thanks, Professor.
you just made me understand subnets in less than 5 minutes wow
I understand this now- you the man 👍🏽
perfect video!! thanks a lot :)
You are a G for this.
You are a literal god.
You rock! I understand it now.
Excellent video 👍. Thanks 🙏🏻
So easy to understand.
Great Video!
God bless you 🙏🏻❤️
Very well explained!
thank you so much boss!
Hi professor, thank you very much for your videos! I have a question, on 4:00 isnt /24 a Class C subnet making it a classful addressing instead?
We've not used classful addresses since 1993. The address in the video is an IP address with a 24-bit subnet mask.
What would be the purpose of say starting with a Class A subnet but using classless addressing to shrink the amount of hosts to that of a Class C subnet as shown in 3:30 in real world application?
As you decrease the number of available hosts on a subnet, you increase the number of available subnets. Instead of a single subnet with millions of possible hosts, you can have thousands of subnets with hundreds of hosts on each subnet.
A VERY BIG THANK YOU.
7:21 How do we know its /26 ? If we do not know its /26, how can we know how many bits we give to subnet and how many we give to host ?
I have the same question. I know 192 means 3 octets equal 255 and then the fourth is the one you need to worry about. After that I am lost.
I think you're thinking of it backwards. You don't get the CIDR notation (the /26) until after you've actually created the subnet. You wouldn't realistically be in a situation where you wouldn't know that it's /26 because /26 is just an easy way to notate that you're using the first 2 bits of the last octet as subnet bits.
@@ChaosMonkeyPlays It just means that you're stealing bits from the last octet, so instead of leaving the last 8 alone for the hosts, you're snatching the first two bits from that octet and using those as your subnet bits.
Excellent, is there for IPV6 like this?
Since we're in a time where you can test at home, with no calculator OR scratch piece of paper, I have no idea how I'm going to do this in my head AND not mumble to myself. This will be interesting.
How did you overcome this challenge? Testing this month
Yeah, same here. Using the virtual whiteboard provided doesn't cut it!
@@djsoundhash Very frustrating, it feels like they want you to fail at times... did you come up with a solution?
@@codygosney976 No, not yet anway. I didn't need the whiteboard when taking the A+ and I've only just begun studying for the Net+. May just sit the exam in a test centre tbh!
After action report: I took the exam and passed. Ended up scheduling it at a testing center so I wouldn't run into this silly white board issue. It turned out I didn't even need it for the exam, there was only one subnetting question and I was able to quickly solve it from available choices and deduction. They do still provide the whiteboard if you end up with a version of the exam with more subnetting questions.
I think I'm missing something basic here... I understand the principle and the formulas make perfect sense but I'm struggling with how you would know what the value of the subnet mask would actually be for a VLSM that you choose to use. Any help would be appreciated :)
Not sure if you figured out what you were asking but if not check out his earlier video of the playlist on IPv4 subnet masks: ua-cam.com/video/L3dsWxn5RBU/v-deo.html
I think you'll find in there what you're asking.
@Professor Messer
Could you do a video like this for ipv6? or the equivalent ?
Generally speaking, you don't have to do these variable subnetting tasks in IPv6 because you have so many networks and hosts available.
I'm a little confused. Is it even possible to have a 172.16.55.0/21 network? If you look at the third octet, 55 would be 00110111 in binary. If your subnet bits only use the first five bits in the third octet (11111000) you wouldn't be able to have the number 55. I know I'm overthinking this, and I understand that this isn't the point of this lesson; however, I just wanted to know I was thinking about this correctly.
The example of 172.16.55.0/21 is referencing an IP address, not a subnet. The subnet address for a device on that subnet would be 172.16.48.0.
@@professormesser I see, thanks for the clarification!