Just recorded a quick
Just recorded a quick video with no editing to demonstrate my favorite method to subnet very quickly. In this video I assume that you have already learned subnetting so I leave out a bunch of information about the "why" behind a subnet and just teach you the method. If you do not completely understand subnetting, please watch a longer more in-depth video first!
Fore more networking videos, I highly recommend these two channels as they are what I used to get my CCNA (as well as a website):
Website: Networklessons.com (not free, but I love love love this website for learning material)
Looking for a community to join? Reddit has a brilliant subreddit for getting extra help:
I also used Boson to be able to pass my ICND exams on the first try:
It's almost impossible for me to leave comments ... but You are a genius. Thanks a Million....
I see how this would work with Class C. How would you come up with the usuable IP's for Class A & B?
As you said you are working with a / 11, how did you know that it would be 2nd oxted? Also would this chart work with classes A and B? Thanks
@3:30 How did you get 9, 10, 11? I don’t quite get that part.
Best video for Subnetting. Basic and Simple.
This video lecture is
This video lecture is produced by S. Saurabh. He is B.Tech from IIT and MS from USA.
Slides are from Computer Networks: A Top-Down Approach
Behrouz A. Forouzan
It is one of the best books on networking, I like the presentation of the concepts in this book a lot personally.
Understand the concept of classless addressing
1. Be able to find the first and last address given an IP address
2. Be able to find the network address given a classless IP address
3. Be able to create subnets from a block of classless IP addresses
4. Understand address allocation and address aggregation
To study interview questions on Linked List watch http://www.youtube.com/playlist?list=PL3D11462114F778D7&feature=view_all
To prepare for programming Interview Questions on Binary Trees
To study programming Interview questions on Stack, Queues, Arrays visit
To watch all Programming Interview Questions visit
To learn about Pointers in C visit
To learn C programming from IITian S.Saurabh visit
didnt understand only..!!
stop fumbling and repeating OKs,jst concentrate on how well u can explain..Your explanation is not at all upto the mark bcaz its confusing,i'm sry to say that but it's true..
sir i hardly trying to understand this pls in 9:20 what the connection between 52 and 12?
For the people that are confused starting at 5:18:
At this point he is explaining that with a block size of 2^8 the only bits that could possibly not be divisible by 2^8 are the last 8 bits (bits 7-0). What he is doing with a31*2^31+a30*2^30 business is representing the ip address as a binary integer instead of a dotted decimal. For instance a31 represents the left most (most significant) bit in the address. all of the a31...a0 are just bits (0 or 1)
In the example that follows, where we are checking a block that contains 16 addresses the only bits that can't be divisible by 16 are the last 4 bits (16=2^4) so he is checking if the last 4 bits of each address are divisible by 16.
If this is still very confusing you might want to make sure you understand binary integers before continuing.
Discusses a cache's block
Discusses a cache's block size (including benefits and potential costs)