Who understands IP addressing stuff - help plz?

-Mike- · 22 Dec 2009 at 18:15

Hi all,

I have an assignment to do and as such I am NOT asking for answers, simply how to work out the answers to similar questions. If anyone can suggest any reading or other material to help me understand I'd really appreciate it.

Here's an example, which I will change the IP addresses etc of

Please note the subnet 0 (zero) is counted as the first subnet.

(a) In your network you have chosen to use the address 196.80.22.0
I. What class of address is this? Justify your answer including binary and dotted decimal notation. (2 Marks)
II. What mask should be applied to give 18 usable hosts per subnet? Justify your answer including binary and dotted decimal notation. (4 Marks)
III. What mask should be applied to give 20 subnets? Justify your answer including binary and dotted decimal notation. (4Marks)

Please do not answer the questions unless you really feel the need to, I just would like suggestions on further reading to enable me to complete this!

Thanks

-Mike- · 23 Dec 2009 at 14:15

Holy reply!

Thank you very much I wasn't expecting that much of an answer from one person so thank you very much for explaining it to me! I shall have a good read in a minute and try and apply it to my work! Its annoying, the mark for this thing is 50% of a module and includes the average of the CCNA exams for part of the marks!

Thank you very much though I shall get reading and post back

-Mike- · 23 Dec 2009 at 14:31

I'm confused!

My IP address is 196.80.20.0,

This would make it a class C address, I don't know why or how I'm supposed to prove that but from the cisco document its class C

Binary anding doesn't mean a lot to me, I don't see what that has to do with anything? How did you work out or come to the conclusion on your subnet the choice given you wanted in your example 60 hosts? What determines that?

-Mike- · 24 Dec 2009 at 12:32

bigredshark said:
slightly off topic, but why is there still this obsession with teaching classful networks? It's irrelevent, it's antiquated and it's a pain to beat out of people to make them understand CIDR...

Still, he's right, until you know it doing the binary bit is the easiest way...

Lol I don't think I'll ever understand this! To be honest I can't believe its an assignment.... given he talked about it for only a single hour. Love my course tbh!