Custom Subnetting help plleeeaase

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Hey Guys,

Already a bit stuck lol.
I was doing fine up until I came accross a class A IP scheme using what looks to me like a class B masking scheme (Based on the second octet being populated in the network ID).

Network ID: 10.252.0.0
Minimum subnet hosts required: 400
Minimum networks required: 100

Custom Subnet Mask 255.255.254.0
Maximum Hosts Per Subnet 510
Maximum Subnets 32768
Subnet IDs

10.252.0.0
10.252.2.0
10.252.4.0
10.252.6.0
---
10.252.254.0 <-------- I'm fine up until here.

But then the host rangers screw me up.

Host ID Ranges

10.252.0.1 – 10.0.1.254 <--- What exactly happens here, why does the 252 get replaced with a zero as an acceptable host range? With a mask of 255.255.0.0 can't we only use the 3rd and fourth octet? Perhaps this is where my error is. Should I be treating this question as a class A?

10.252.2.1 – 10.0.3.254
10.252.4.1 – 10.0.5.254
10.252.6.1 – 10.0.7.254

10.252.254.1 – 10.252.255.254

 

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Looks like a set of typos to me. Perhaps some cut'n'paste that got overlooked.

Now that line is believable!

Harry.

 

Lol I hope you're right, cause then I can move on!
This is a publicly posted exercise from a trusted vendor though, seems strange that it would just be wrong.

 

Why not drop them a line about it?

Can you post a link?

Harry.

 

Once you reach 10.252.255.254 it would have to increment the number before it for the next network

ie 10.253.0.0 (or 1 for 1st host address) etc.

 

I don't know if I'm breaking any rules here. But it's on nuggetlab.com, which is free and open to the public.
http://www.nuggetlab.com/server_2003/291.zip
That's the zip file that contains subnetting exercises.

Sorry if I've violated anything, I'll remove this post if I have.

 

Don't believe you have matey. Just breathe.....

breeeaaathhheee.

I'm sure the OP will appreciate the link.

Qs

 

Just typos those networks are impossible lol

 

The 10.252.254.1 – 10.252.255.254 in this excercise represents the last possible subnet and the last possible range for that subnet.

What happens before that is what I don't get, how do you go from 10.252, to 10.0?

 

lol what a Relief, I've been thinking myself in circles for the past hour.

 

Lol thanks Qs

 

You don't.

replace the second octet of '0' with 252.

Harry.

 

Read the comprehensive guide here and hopefully it will help.

You think this is bad?... wait till VLSM...

 

Awesome thanks guys.
Lol this stuff wasn't that bad, only the typos, figured the lab was posted ages ago so any errors would of been pointed out and corrected. So i figured it had to be right, and that my thinking wrong.
VLSM eh... that does sound scary