classB subnet answer

[nawkwan]

Hi systemerror11,

The 3rd octet with the value '89' lies between 88 and 92, why are you choosing 88 and not 92? What happens if the number was 90 (which is the midpoint of 88 and 92), what would it be?

Thanks!

[systemerror11]

@nawkwan in that example 88 and 92 are network addresses. That means that all the numbers in between are possible host addresses (89,90,91)

Since 89 is higher than 88 (which is a network address) and before 92 (the next network address) that means its in the 88 network. Thats because everything after 88 is in the 88 network until you get to the next network, which is 92.

If the number was 90, that is still in the 88 network because it does not fall past (or into) 92. I hope thats a bit clearer.

[nawkwan]

@systemerror11

Concurs with an earlier comment: "So bloody helpful thanks mate" ^^

[mark1192]

i found this helpful too. but what is the broadcast address of that network? im pretty confuse on getting the broadcast.

[systemerror11]

@mark1192 The broadcast address would be the last possible address before the next network - so in this case it is 172.29.91.255

I hope that clears it up for you.

[mrr344]

so bloody useful thanks mate

[Darkmanskin]

HELP!!!  Network ID 150.50.0.0 Required number of subnet is 125

[emgarc1982]

You are an asset to the human race.

I could not work out a Network address for an IP with a /19 address until I found this video.

[systemerror11]

Ha ha, I am glad you found it helpful. Ive been called many things throughout my life but an asset to the human race is new. I'll put it on my resume. :)

Thanks!

[emgarc1982]

I'm currently doing a CCNA and the material only had examples for /25 and up. Everyone you speak to knows how to work out a subnet if it's above /25.. so when I mention a /22 or /19 they clam up. I sat through an hour long Subnet lecture from some Indian university and all examples were for /25 and up. You just shot past the BS and got on with an actual example and I know how to work it out now for myself. Really grateful. So I'll name my first born systemerror11.

[bobsters098]

wat if it is 255.255.255 then wat is octet I use

[systemerror11]

the last one. I dont quite understand the question.

[bobsters098]

the subnet mask is 255.255.255 so i just use 1 for the network sizes or what

[systemerror11]

yeah you could the valid range would be 1-254. 0 is reserved for the network and 255 is reserved for the broadcast.

Hope that helps/

[taocircle]

THANKS! You are the man for producing this so fast, you didn't have to because it was just me practicing at home, but I do say thanks. Yeah the 256-252= 4 (delta) which lets you know the networks you go by. Thanks, I needed to make sure that I was doing it the right way. You should do some on super netting, etc. because you're good at explaining. PEACE!

[punxz18]

yay! are you gonna teach networking now? :)

[systemerror11]

from the subnet address. each octet is made of 8 bits, its borrowing a few bits from the one octet (252) Sorry if I wasnt clear, like I said its a rush job.

[majin534]

how do you know how many bits its using? I followed most of it...