For those stuck on IP subnetting, it is useful to remember this chart. If a question doesn't specify the starting network ID or mask then you are most likely utilizing the last octet/ 24 CIDR. CIDR /24 Mask Increment Host = Inc -2 /25 128 128 126 /26 192 64 62 /27 224 32 30 /28 240 16 14 /29 248 8 6 /30 252 4 2 /31 254 2 0 Since the question at 6:24 didn't say how many hosts or how many addresses for each subnet you need to assign, you can look at the increment in the chart to find the mask. The testing center should provide a sheet of paper and pencil for the test, and you can write this down before you start. Notice how the math works out, the mask plus the increment always adds to 256 for each line, the max amount for an octet. As long as you can remember the /25 line you can make by. Divide the increment in half each time, then add that total to the last mask you have. Ex. 128/2 = 64 + Mask of 128 = 192.
Don’t know if you wrote this as well you can take the cidr notation from 64 192 /26. Since their are 32 bits you subtract 32-26 which is 6 and than you 2^6 which is 64
Thank you so much for sharing this. It's actually really encouraging to hear that the practice questions (not only here but from other sources as well) as generally considered to be harder than the actual exam. I think I'm well on my way to have a good chance of passing.
7:02 I could be completely wrong but I know comptia likes to be sneaky. I think the reason it was 255.255.255.192 instead of 255.255.255.128 is because it stated 64 addresses instead of 64 usable/host addresses. I was also thinking it was 255.255.255.128 until I reread and didn't notice it said "usable" or "host" addresses before or after. (amazing videos btw. thank you)
Hey bro, enjoying the content. I'm a few weeks away from scheduling my exam. I think the reason the subnetting question was incorrect is because it does not specify the need for host addresses. It just says "64 addresses." If it specified "64 host addresses" then 128 would be the correct option, since then you would need to minus the network and broadcast addresses.
To me a nice hack about Subnetting which often works is to pay attention to the last bit. In our case it's 1 so it must be an uneven number which means 198 and 100 are out. There are also many 1's except the LSB (least significant bit - so the one one the right) which means that our value is greater than 1 so can't be 1 either :)
That one question at around 6:30, the reason it’s 192 not 128 is bc the question asks for addresses not hosts. So /27 or 3 borrowed bits will produce 64 addresses. Tricky tricky question.
Its actually /28. We need two bits on the last octet to makeup 192 which are the first and second from the network portion ( 128 + 64 = 192 ). The other remaining bits are off, thus 2^6 = 64 host addresses minus 2 for gateway and broadcast thus we remain with 62 allocateable addresses. Hope this helps! Good luck everyone, don’t sweat it. CompTIA has a tendency of having not so difficult tests 😅
appreciate content not sure how old this is or if you fixed it but raise your voice volume and lower music volume, maybe its just me... sorry for unsolicited advice, my bad if its a bit intrusive or unwanted
honestly. the answer should be D for the subnetting question. if someone says they need 64 addresses I'm going to think ok, they need 64 hosts. and since you remove 2 addresses you are left with 62 total with /26. I guess one could argue they said addresses and its on me to assume hosts, but thats such a ridiculas way to word a question, its literally trying to trick you into chooseing the wrong question even if you understand the fundamentals subnetting
I think the mistake you made on the subnetting question was forgetting that each bit has two options '1' or '0', so instead of 64 you should have counted back to 32, as this would have given you the 64 channels you require.
Dude, was the music really necessary? The music is louder than you for crying out loud. Keep the videos simple and watch before you upload them. That way you'd know how loud the damn music is!
For those stuck on IP subnetting, it is useful to remember this chart. If a question doesn't specify the starting network ID or mask then you are most likely utilizing the last octet/ 24 CIDR.
CIDR /24 Mask Increment Host = Inc -2
/25 128 128 126
/26 192 64 62
/27 224 32 30
/28 240 16 14
/29 248 8 6
/30 252 4 2
/31 254 2 0
Since the question at 6:24 didn't say how many hosts or how many addresses for each subnet you need to assign, you can look at the increment in the chart to find the mask. The testing center should provide a sheet of paper and pencil for the test, and you can write this down before you start. Notice how the math works out, the mask plus the increment always adds to 256 for each line, the max amount for an octet. As long as you can remember the /25 line you can make by. Divide the increment in half each time, then add that total to the last mask you have. Ex. 128/2 = 64 + Mask of 128 = 192.
Nice explanation!
I saw this chart on a sunny video and it's definitely worth remembering... and not that hard
Don’t know if you wrote this as well you can take the cidr notation from 64 192 /26. Since their are 32 bits you subtract 32-26 which is 6 and than you 2^6 which is 64
Make sure you write the cheat sheet correctly cause it goes with all 4 octets and that’s how you solve for each octet
That's how I got there too, I was screaming A lol. We're not going to have time to do calculations during the exam. Nice to have a cheat sheet!
Thank you so much for sharing this. It's actually really encouraging to hear that the practice questions (not only here but from other sources as well) as generally considered to be harder than the actual exam. I think I'm well on my way to have a good chance of passing.
Taking the exam THIS morning! This definitely helped, thank you so much Vincent!
Best of luck to you Matt!
@@vincenthumble I passed! Thank you so much!
That's great!! Congratulations 😁
7:02 I could be completely wrong but I know comptia likes to be sneaky. I think the reason it was 255.255.255.192 instead of 255.255.255.128 is because it stated 64 addresses instead of 64 usable/host addresses. I was also thinking it was 255.255.255.128 until I reread and didn't notice it said "usable" or "host" addresses before or after. (amazing videos btw. thank you)
Thanks for these types of videos, it’s helpful so please keep them up!
Glad you like them!
Hey bro, enjoying the content. I'm a few weeks away from scheduling my exam.
I think the reason the subnetting question was incorrect is because it does not specify the need for host addresses. It just says "64 addresses." If it specified "64 host addresses" then 128 would be the correct option, since then you would need to minus the network and broadcast addresses.
Ah yes, that makes sense! Good observation. Thank you!
Enjoying the content. I’ve yet to take my exam so along with Professor Messer, you are helping me learn. Thanks. 😁
Thanks for watching! Glad it's helpful! Professor Messer is great
I’m taking my exam tomorrow morning so thanks for this!!
To me a nice hack about Subnetting which often works is to pay attention to the last bit. In our case it's 1 so it must be an uneven number which means 198 and 100 are out. There are also many 1's except the LSB (least significant bit - so the one one the right) which means that our value is greater than 1 so can't be 1 either :)
Great info and great way of presenting the information! The only advice I have would be to lower the background music. Otherwise, great job overall!
Awesome, glad you found it helpful. I also appreciate the feedback, thank you.
That one question at around 6:30, the reason it’s 192 not 128 is bc the question asks for addresses not hosts. So /27 or 3 borrowed bits will produce 64 addresses.
Tricky tricky question.
Its actually /28. We need two bits on the last octet to makeup 192 which are the first and second from the network portion ( 128 + 64 = 192 ). The other remaining bits are off, thus 2^6 = 64 host addresses minus 2 for gateway and broadcast thus we remain with 62 allocateable addresses. Hope this helps! Good luck everyone, don’t sweat it. CompTIA has a tendency of having not so difficult tests 😅
appreciate content not sure how old this is or if you fixed it but raise your voice volume and lower music volume, maybe its just me... sorry for unsolicited advice, my bad if its a bit intrusive or unwanted
I greatly appreciate you sir
Thank you Shooter!
Yeh I think question 2 is if 64 is the supposed magic number it’s basically 256- 64 to get you to 255.255.255.192. Which is also 2 bits 128+64
For a subnet mask containing 64 ( host ) addresses, would mean four networks/subnets with 192 in the fourth octet.
Can I ask you some advice? I've been working on the network for a number of years, should I just give up?
The music is loud enough that it makes it very distracting when trying to hear what you are saying
Thank you for the feedback. I'll tone it down in future videos
Will this be on the certification exam?
Not these exact questions, but yes this material
I like it trick question
honestly. the answer should be D for the subnetting question. if someone says they need 64 addresses I'm going to think ok, they need 64 hosts. and since you remove 2 addresses you are left with 62 total with /26. I guess one could argue they said addresses and its on me to assume hosts, but thats such a ridiculas way to word a question, its literally trying to trick you into chooseing the wrong question even if you understand the fundamentals subnetting
Music levels are too high bruv.
I can't concentrate with the music on.
Yeah, sorry about that. I'll have to have a talk with my editor :P
I think the mistake you made on the subnetting question was forgetting that each bit has two options '1' or '0', so instead of 64 you should have counted back to 32, as this would have given you the 64 channels you require.
Can't read the question
Background music is too loud compared to your voice.
CAM is MAC backwards 🤪
Do you really passed????????????
Yes!!!!!!!!!!!!!! :)
Dude, was the music really necessary?
The music is louder than you for crying out loud.
Keep the videos simple and watch before you upload them. That way you'd know how loud the damn music is!