+Nijer Manus exellent tip

I have a question Khan. Why it in 128, not in 136 network. I am referring to 11:11. Thanks.

thank you

not all heroes wear capes

yes this is good also.

Jordan,same deal with me. Lol : Jordan K 1 year ago this really helped me, and your explanation is so easy it made me laugh after being so confused from sitting in lectures

my same thoughts

Moe Zuiter

THANK YOU!!!

You can take the 128 and then add the next number under it, then keep adding... so 128 + 64 to get 192. Then add 32 to get 224, etc. So go right to left on the bottom multiplying by 2, then left to right on the top by adding the next number.

awesome one thank you :)

Watch "Subnetting is simple" by sunny classroom

SBrawlers same here

the second example threw me on

SBrawlers can someone please explain how on the second example the third octet how did he get 255 I'm so lost

This video is an oversimplification of what is actually happening, but it is a helpful video nonetheless. Subnet-Mask ignores all the IPs below it but leaves all the high numbers(octaves) of what's left for the subnet. After you get the SubNetMask: 255.255.128.0 Just look at the last two Octaves(Numbers): 128.0 The first 2 octaves don't matter because they've already maxed out, and in the 3rd octave, anything below 128 doesn't matter to the subnet. Two of those left over IPs must be assigned to identify the subnet itself for delivering data and broadcasting data within the subnet. These are; 1) Network IP: 153.34.128.0 (That's the lowest unmasked value, it starts where the SubNetMask masked it) 2) Broadcast IP: 153.34.255.255 (Note the last two Octaves have gone max value, that's because the SubNetMask isn't stopping it) The FirstHost and LastHost are just in between those numbers.

yea the second example got me right

Maybe it wasnt totally clear, but he kinda explained in the beginning. IS that 2 of the addresses are reserved. One for network address and one for the broadcast address, These are the 2 that you subtract. So lets say you have a network with 64 hosts, but there are only 62 usable host because the network and broadcast address are reserved.

There are some "truths" you learn along the way when learning this stuff. A few of them are: - The NetID + 1 = The 1st Usable Host IP - The NetID + the Increment = The *Next NetID* - The *Next NetID* - 1 = The (previous NetID's) Broadcast IP - The *Next NetID* - 2 = The (previous NetID's) Last Usable Host IP

Craig Wallace totally agree, it was horrible. He needs to tie everything back to real concepts. This not a math class

hes expecting you to have a general concept of what your doing he explained that hes not going into depth he was just doing a video to help others but he wasn't going to go into depth so for what it was it was perfect for me, helped me pass my test with the way he explained it so its all about how much you actually know already, if you don't have an understanding in binary and networking your not going to understand anything hes talking about really, hes just helping people who already understand it but are still having trouble with it so hes offering a different solution and i like this solution it helped me a lot.

I agree. Actually, his explanation is somewhat clearer for me than other more detailed, drawn out longer videos. Straight-forward and no fluff works well for me.

most course give the same cheatsheet and do not explain about the how and the why.

Since the "increment" was 8 -- he was trying to figure out/guess which "set of 8 IPs" the starting IP was in. Turns out the IP was in the 16th set of 8 -- which started with 128. (17 x 8 was too high; 16 x 8 was just right.)