Comptia Network+ Practice Questions with Answers N10 008 Explain IPv4 Addressing 

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.

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.

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.

Taking the exam THIS morning! This definitely helped, thank you so much Vincent!

Thanks for these types of videos, it’s helpful so please keep them up!

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 :)

Enjoying the content. I’ve yet to take my exam so along with Professor Messer, you are helping me learn. Thanks. 😁

I’m taking my exam tomorrow morning so thanks for this!!

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.

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!

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?

I greatly appreciate you sir

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

The music is loud enough that it makes it very distracting when trying to hear what you are saying

Will this be on the certification exam?

I like it trick question

I can't concentrate with the music on.

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.

Music levels are too high bruv.

Can't read the question

CAM is MAC backwards 🤪

Background music is too loud compared to your voice.

Do you really passed????????????

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!