TCP IP Calculation or Tutorial

[Cap2010]

hi,

Currently, having an exposure to TCP/IP.

I want to do calculation TCP/IP and subnet.
After going through the books of tcp/ip including MCSE - TCP/IP. Have a question

Question.
1) How to calculate subnet mask.
2) At times it is written as 182.120.57.30/26 (in this fashion)what it means and what is the calculation behind it.
3) Need good sites on tcp/ip for information and tutorial with calculation.

Thanks,

Lad

 

[bobthecat]

Try this link......

http://www.learntosubnet.com/

Bob ^^

 

[bobthecat]

And for a calculator

http://www.wildpackets.com/products/ipsubnetcalculator

Bob ^^

 

[wybnormal]

2) At times it is written as 182.120.57.30/26 (in this fashion)what it means and what is the calculation behind it.


there are 3 common classes A, B and C... each class has a range of IPs in it and a certain *mask* that it uses as a default. There D and E classes but they dont count in this discussion

A- 255.0.0.0
B- 255.255.0.0
C- 255.255.255.0

The 255 octet is all 1's..
11111111

So if you have a class C 4 octet number.. and then the mask is applied to "filter" out the unwanted bits

192.168.0.1
11000000.10101000.00000000.00000001
mask
11111111.11111111.11111111.00000000 ( also seen as /24)

Where the mask stops, the host numbers start. What the mask covers up is the network ID. You can see that the first 3 octets are filtered by the mask. So the network ID is 192.168.0 and the host ID in this case is .1(.001)

The /24 is from adding up the 3 groups of 8 bits. 3x8=24

I have a nice paper for DLing from 3com about this at my site.. drop by and go to the downloads

MikeS Find me at

http://www.packetattack.com

"Diplomacy; the art of saying 'nice doggie' till you can find a rock" Wynn Catlin

 

[Cap2010]

hi,

Thanks, for the answers, it really helped to solve my doubts.

One last question - I want to skill my self in networking, and currently have learn the basics / topology of the same.

Beginners level to certain extent have done.
What should i do to gain experience and skills in Networking.

As far as learnsubnet has avi files to learn and not pdf/html/doc files to read.

Thanks,

captain

 

[wybnormal]

Learn:

subnetting
OSI 7 layer model WELL
How the layer interact
basic routing
basic switch operation (includes things like spanning tree)


Practice!!!! get time on rental labs, your own routers or borrowed routers. Some like the sims but I have found many to poorly done and they are still a sim. Even the miltary which has the best sims in the world, require time in a real plane, shuttle, etc.

Find a study group if possible.. or buddy up with someone willing to *mentor* you. It really helps to have extra people around to bounce ideas off of.

MikeS Find me at

http://www.packetattack.com

"Diplomacy; the art of saying 'nice doggie' till you can find a rock" Wynn Catlin

 

[Cap2010]

HI,

Thanks, for the answers.

Cap2010

 

[cheat]

This is an online IP calculator with help. Save to hard drive for offline use.

http://www.agt.net/public/sparkman/netcalc.htm