SUBNETTING for CCNA students
4.4 (50 ratings)
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SUBNETTING for CCNA students

Master subnetting when taking CCNA exam
4.4 (50 ratings)
Instead of using a simple lifetime average, Udemy calculates a course's star rating by considering a number of different factors such as the number of ratings, the age of ratings, and the likelihood of fraudulent ratings.
1,226 students enrolled
Created by Jimmy Larsson
Last updated 1/2017
Current price: $12 Original price: $20 Discount: 40% off
3 days left at this price!
30-Day Money-Back Guarantee
  • 1 hour on-demand video
  • 3 Articles
  • Full lifetime access
  • Access on mobile and TV
  • Certificate of Completion

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What Will I Learn?
  • understand the structure of IP addresses in relation to subnet masks
  • calculate usable subnet given size requirements
  • Answer certification-type questions regarding subnetting
View Curriculum
  • You need to know basic math, like adding 64 with 32.

Course last updated 2016-04-01

Now more than 1000 students!

No Powerpoints, no animations. With just a pen I will teach You how IP subnetting works. From binary math to subnet sizes and exam-like questions to verify Your achieved knowledge!

Remember! 30 days money-back guarantee with no questions asked. I want you to be satisfied with my course. No Happy - No Pay!

Also, please take advantage of the free previews to see way you will get.

After taking this course, which takes less than one hour, you will never again need a subnet calculator. Subnetting can be done without any online subnetting calculator, all you need is a pen and paper and you will be able to create your own cheat sheet. What is my subnet mask? How many usable addresses in my network? What is the broadcast address? All of these questions will be easy to answer after enrolling this course!

After each lesson there is a quiz that verifies the knowledge you just achieved!

This course is good for anyone that needs to fully understand subnetting, including CCNA students!

2016-01-03 Re-recorded lecture about 24 bits example. Free preview!

2016-04-01 New promo-video

Who is the target audience?
  • The targets of this course are people with a need to understand the relationship between an IP address and its associated subnet mask.
  • If you need to under stand subnetting to pass any exam where this is required, this course is for you!
Compare to Other Subnetting Courses
Curriculum For This Course
18 Lectures
1 Lecture 00:32

I introduce myself, my background and why we need subnetting.

Preview 00:32
How to do the math
4 Lectures 15:27

I explain how the binary numbering system works and how to convert between decimal and binary numbers.

Preview 06:55

Conversion between binary and decimal
2 questions

Learn how a subnet mask look like in binary. Understand the rules of a valid mask and differentiate those from invalid masks.

Preview 05:01

Converting binary masks to decimal is not harder than any other binary numbers.

Preview 03:08

A small quiz to validate what you have just learned about binary subnet masks.

See if you can spot valid and invalid subnet masks in binary
2 questions

Prefix notation

Verify your knowledge of prefix notation by answering a few questions.

Quiz: Prefix notation
3 questions
Learn how to define the network.
1 Lecture 04:02
The Network
Supernet or summarize subnets
6 Lectures 27:38

Supernetting is the opposite to subnetting. When you supernet you group together multiple subnets in one definition, for example in route summarization.


A short history lesson about classfull netmasks.

The old classfull netmasks

Start simple, here we look into how a /24 works and looks like.

24 bit example

We look into a smaller subnet.

29 bit example

What happens when we cut a subnet in halves?

Subnet further...

The cheat sheet
Example questions
5 Lectures 14:40

Find out how many usablet addresses there are given a specific subnet or prefix.

How many usable ip addresses in the subnet?

A tricky question. Dividing a range in smaller parts gives us multiple networks. How big are they? Where are the borders?

You split the available range of addresses into smaller subnets.

We have specific requirements, lets find the best solution.

Specific requirements for subnets.

How we convert from a specific prefix to its corresponding mask.

Convert prefix to mask

Tricky question 1
Bonus material
1 Lecture 00:43
Bonus lecture: About me and my other courses
About the Instructor
Jimmy Larsson
4.3 Average rating
604 Reviews
3,733 Students
10 Courses
Senior Consultant, Instructor and CISSP

I have been working in IT since 1991. My focus the last 15 years has been in Routing&Switching and Security. I have certifications in Cisco (CCNA, CCNP, CCSP) since 2000, also certified Checkpoing CCSA/CCSP and ISC2 CISSP. After 20+ years as an IT consultant I have a broad as well as deep knowledge in TCP/IP, routing, switching and firewalling.