Learn IP Subnetting the Easy Way: Subnet with Confidence
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Learn IP Subnetting the Easy Way: Subnet with Confidence

The pros can subnet easily. Learn the subnetting secrets of the professionals and subnet like a subnetting master.
4.6 (36 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.
1,162 students enrolled
Created by Ric Smolenski
Last updated 9/2016
English
Current price: $10 Original price: $40 Discount: 75% off
5 hours left at this price!
30-Day Money-Back Guarantee
Includes:
  • 3.5 hours on-demand video
  • 24 Articles
  • Full lifetime access
  • Access on mobile and TV
  • Certificate of Completion
What Will I Learn?
  • Convert decimal numbers to binary numbers
  • Convert binary numbers to decimal numbers
  • Understand the components of an IP address
  • Quickly subnet networks
  • Quickly determine the broadcast, network, and host addresses of subnetworks
View Curriculum
Requirements
  • Students should be familiar with basic networking.
Description

In this course you will learn how to subnet IP addresses in preparation for a certification exam or your networking career.

Learn how to subnet in your sleep (or at least no longer have nightmares about subnetting).

  • Learn how to convert binary numbers to decimal numbers and vice-versa.
  • Learn how to subnet.
  • Learn how to answer the most common subnetting exam questions.

Take the fear away from subnetting and feel comfortable under exam pressure!

Let's admit it. Subnetting is usually one of the most difficult skills to master for new network administrators. I've taught networking students to subnet since 2003 and the problem for most students is that they aren't that good at math. But subnetting doesn't even use math we're used to so it can be even more confusing.

Over ten years ago I developed lectures on subnetting for a college that were so powerful I was asked to write a textbook by a major textbook publisher. The challenge was that the lectures were so powerful that I was also offered a promotion and had to move. That meant that I couldn't finish the textbook, but it gives you the ability to experience the content here. 

This course contains the original textbook material in article form along with explanatory video lectures, quizzes, and case problems so you get the best of both worlds. You'll get all of the information you need in the video lectures, but you can also read the textbook content, take the quizzes, and complete the case problems to increase your learning.

I designed this course to be easy and accessible to beginners yet also good if you've learned subnetting before and just need a refresher. 

At the end of this course you'll know all of the basics of IP addresses and subnetting and be ready for your career or certification exams.

Who is the target audience?
  • This Subnetting course is meant for networking students or administrators looking to increase their subnetting knowledge.
  • This course is probably not for you if you already understand the basics of IP addresses and how to subnet.
Students Who Viewed This Course Also Viewed
Curriculum For This Course
68 Lectures
04:02:30
+
Introduction
1 Lecture 01:40

This video contains an introduction to the course. Learn what you will learn about subnetting. 

Preview 01:40
+
Numbering Systems
7 Lectures 29:17

Before we learn IP Addressing and subnetting we have to be familiar with the Binary Numbering System. But how do you learn a new numbering system? By first looking at one that you already know. We'll review the Decimal Numbering System to give us a framework for learning the Binary Numbering System.

Preview 03:44

This is a section from the CCNA textbook I was writing for a book publisher, but never finished because I was promoted, had to move, and couldn't meet deadlines. The video lectures contained in this section are based upon the content here. Think of this as your textbook and the video lectures as a traditional classroom lecture. This lesson will start you on your path to learn my subnetting secrets. 

Decimal Numbering System
01:22

IP Addresses, Subnets, and anything that has to do with computers are all based on the Binary Numbering System. We'll use the framework we learned when looking at Decimal to understand the basics of Binary. Without knowing binary you won't be able to learn subnetting.

Preview 04:46

In this video I'll show you how to convert decimal numbers to binary numbers, which is a very important step in the process of IP Subnetting.

Converting Decimal Numbers to Binary Numbers
08:02

Learn how to convert binary numbers into decimal numbers. It's as easy as addition! Who knew that this part of subnetting could be so easy?

Converting Binary Numbers to Decimal Numbers
04:10

This is a section from the CCNA textbook I was writing for a book publisher, but never finished because I was promoted, had to move, and couldn't meet deadlines. The video lectures contained in this section are based upon the content here. Think of this as your textbook and the video lectures as a traditional classroom lecture. Review binary numbering before we move on to subnetting. 

Binary Numbering System
03:17

See how much you learned about the binary and decimal numbering systems.

Numbering Systems Quiz
3 questions

Watch as I work through all of the questions on the quiz. Once you master this knowledge you'll be ready to move on to subnetting. 

Quiz Explanation
03:56
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IP Addressing
15 Lectures 01:09:51

It might sound pretty basic, but before we define an IP address let's take some time to review what a regular address is. We'll even look at phone numbers! Yes, I'm teaching you the building blocks of subnetting by looking at phone numbers :)

What Are Addresses?
03:54

Now that you have reviewed the basics of a regular address it's time to learn what an IP address is. We'll also do some more decimal to binary conversion. We're getting closer and closer to learning about subnetting. 

IP Addresses
06:13

IP addresses have a host and network portion. Learn how to determine which part of an IP address is network that the host resides on and which is the address of the host. Big hint: it has something to do with subnet masks. Hey, that sounds like we might be closer to subnetting. 

Hosts and Networks
06:31

This video provides an introduction to the concept of IP address classes before we dive deeper into the details. We have to know the standard classes before we change things with subnetting. 

IP Address Classes
03:36

This is a section from the CCNA textbook I was writing for a book publisher, but never finished because I was promoted, had to move, and couldn't meet deadlines. The video lectures contained in this section are based upon the content here. Think of this as your textbook and the video lectures as a traditional classroom lecture. Knowing IP addressing is an important prerequisite to subnetting. 

IP Addresses, Octets, and Classes
02:16

How do you know what IP Address Class a given IP Address falls into? Find out in this video. Subnetting is build on IP address classes.

IP Address Class First Octet Ranges
04:39

The different IP Address Classes also have different default subnet masks. What are they? Find out in this video. These are the standard ones; no subnetting yet :)

Default Subnet Masks
05:39

This is a section from the CCNA textbook I was writing for a book publisher, but never finished because I was promoted, had to move, and couldn't meet deadlines. The video lectures contained in this section are based upon the content here. Think of this as your textbook and the video lectures as a traditional classroom lecture. Now that you know the defaults you're ready to change them using subnetting. 

Default Subnet Masks and IP Address Class First Octet Ranges
04:10

Let's explore the purpose of each IP address class. We'll also take a look at how many hosts and networks each class supports. Later we'll be changing these through subnetting. 

IP Address Class Uses
04:59

This is a section from the CCNA textbook I was writing for a book publisher, but never finished because I was promoted, had to move, and couldn't meet deadlines. The video lectures contained in this section are based upon the content here. Think of this as your textbook and the video lectures as a traditional classroom lecture. Later we'll be changing these with subnetting. 

IP Address Class Uses
00:54

I have already briefly introduced the term "broadcast address." Now we'll define what that is along with the network address and the process called ANDing. This is the basis of subnetting. 

Network Addresses, ANDing, and Broadcast Addresses
07:01

This is a section from the CCNA textbook I was writing for a book publisher, but never finished because I was promoted, had to move, and couldn't meet deadlines. The video lectures contained in this section are based upon the content here. Think of this as your textbook and the video lectures as a traditional classroom lecture. This is the basis of subnetting.

Network Addresses, ANDing, and Broadcast Addresses
01:04

What IP Addresses should you assign your private network? Anything, actually. Unless, of course, you want to connect to the public Internet. That wouldn't be good, even if you were subnetting. 

Private IP Addresses
07:06

This is a section from the CCNA textbook I was writing for a book publisher, but never finished because I was promoted, had to move, and couldn't meet deadlines. The video lectures contained in this section are based upon the content here. Think of this as your textbook and the video lectures as a traditional classroom lecture. That wouldn't be good, even if you were subnetting.

Private IP Addresses
00:33

Test your IP Address Knowledge

IP Address Quiz
9 questions

Watch as I work through all of the questions on the quiz. We're almost ready to actually start subnetting.

Quiz Explanation
11:13
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Case Problems - Part 1
12 Lectures 40:32

When working with IP and MAC addresses, it is important to know how to convert between numbering systems. In this project you will practice your conversion skills.

Case Problem 1: Converting Between Numbering Systems
00:14

When working with IP and MAC addresses, it is important to know how to convert between numbering systems. In this project you will practice your conversion skills. SOLUTION.

Case Problem 1: Solution
07:41

Being able to identify host, network, and broadcast addresses is crucial to setting up a properly working TCP/IP network. In this problem you will determine the host and broadcast addresses for given network addresses.

Case Problem 2: Default Host, Network, and Broadcast Addresses
00:29

Being able to identify host, network, and broadcast addresses is crucial to setting up a properly working TCP/IP network. In this problem you will determine the host and broadcast addresses for given network addresses. SOLUTION.

Case Problem 2: Solution
07:06

Being able to identify host, network, and broadcast addresses is crucial to setting up a properly working TCP/IP network. In this problem you will determine the host and broadcast addresses for given network addresses.

Case Problem 3: Finding Networks with ANDing
00:25

Being able to identify host, network, and broadcast addresses is crucial to setting up a properly working TCP/IP network. In this problem you will determine the host and broadcast addresses for given network addresses. SOLUTION.

Case Problem 3: Solution
13:17

In your role as a network administrator, you may only know a host address, but need to figure out what network the host is on, what the broadcast address for that network is, and what the range is for valid hosts on the network. In this problem, you will practice determining all of these.

Case Problem 4: Finding the Network and Broadcast Addresses from a Host Address
00:43

In your role as a network administrator, you may only know a host address, but need to figure out what network the host is on, what the broadcast address for that network is, and what the range is for valid hosts on the network. In this problem, you will practice determining all of these. SOLUTION.

Case Problem 4: Solution
04:49

In your role as a network administrator, you may only know a host address, but need to figure out what network the host is on, what the broadcast address for that network is, and what the range is for valid hosts on the network. In this problem, you will practice determining all of these.

Case Problem 5: A Large Web Design Company
00:30

In your role as a network administrator, you may only know a host address, but need to figure out what network the host is on, what the broadcast address for that network is, and what the range is for valid hosts on the network. In this problem, you will practice determining all of these. SOLUTION.

Case Problem 5: Solution
03:15

You are the network administrator for a large financial company. There are 96 investment brokers who work at the company. These employees’ computers contain sensitive data and their computers need to be shielded from the Internet.  The CEO of the company asks you the following questions...

Case Problem 6: A Large Financial Company
00:16

You are the network administrator for a large financial company. There are 96 investment brokers who work at the company. These employees’ computers contain sensitive data and their computers need to be shielded from the Internet.  The CEO of the company asks you the following questions... SOLUTION.

Case Problem 6: Solution
01:45
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Subnetting IP
16 Lectures 54:20

It seems that we have everything we need with just the default subnet masks so why would we want to subnet further? Why do we need subnetting?

Why Subnet
04:18

In this lecture we'll review the differences between classful and classless IP addresses/subnet masks using our favorite subnetting chart. 

Classful and Classless Subnet Masks
04:12

This is a section from the CCNA textbook I was writing for a book publisher, but never finished because I was promoted, had to move, and couldn't meet deadlines. The video lectures contained in this section are based upon the content here. Think of this as your textbook and the video lectures as a traditional classroom lecture. Learn subnetting basics.

Subnetting Basics
01:42

There are only a handful of valid Class C Subnet Masks. Find out what they are in this video.You'll need to know this for subnetting.

Class C Valid Subnet Masks
04:33

Each valid Class C subnet mask gives us a different number of hosts and networks that we can use. Find out what they are in this lecture.You'll need to know this for subnetting.

Class C Number of Networks and Hosts
04:46

Now that we've found a subnet mask that works for the number of networks and hosts that we need, let's figure out the network, broadcast, and host addresses for each subnetwork. You'll need to know this for subnetting.

Class C Finding Valid Host, Network, and Broadcast Addresses
06:30

This is a section from the CCNA textbook I was writing for a book publisher, but never finished because I was promoted, had to move, and couldn't meet deadlines. The video lectures contained in this section are based upon the content here. Think of this as your textbook and the video lectures as a traditional classroom lecture. You'll need to know this for subnetting.

Class C Subnetting
01:55

There are a lot more valid Class B Subnet Masks. This is when memorization starts to get difficult. You'll need to know this for subnetting.

Class B Valid Subnet Masks
02:32

Each valid Class B subnet mask gives us a different number of hosts and networks that we can use. Find out what they are in this lecture. You'll need to know this for subnetting.

Class B Number of Networks and Hosts
02:38

Now that we've found a subnet mask that works for the number of networks and hosts that we need, let's figure out the network, broadcast, and host addresses for each subnetwork. You'll need to know this for subnetting.

Class B Finding Valid Host, Network, and Broadcast Addresses
03:08

This is a section from the CCNA textbook I was writing for a book publisher, but never finished because I was promoted, had to move, and couldn't meet deadlines. The video lectures contained in this section are based upon the content here. Think of this as your textbook and the video lectures as a traditional classroom lecture. You'll need to know this for subnetting.

Class B Subnetting
01:01

There are a lot more valid Class C Subnet Masks. This is when memorization starts to get impossible, but don't worry. An easier method is coming soon. You'll need to know this for subnetting.

Class A Valid Subnet Masks
01:47

Each valid Class A subnet mask gives us a different number of hosts and networks that we can use. Find out what they are in this lecture. You'll need to know this for subnetting.

Class A Number of Networks and Hosts
02:13

I'm actually not going to show you how to do this because it's the same as Class C and Class B, but with more bits. You'll need to know this for subnetting.

Class A Finding Valid Host, Network, and Broadcast Addresses
02:17

This is a section from the CCNA textbook I was writing for a book publisher, but never finished because I was promoted, had to move, and couldn't meet deadlines. The video lectures contained in this section are based upon the content here. Think of this as your textbook and the video lectures as a traditional classroom lecture. You'll need to know this for subnetting.

Class A Subnetting
00:23

IMPORTANT: You'll have to do a lot of subnetting on this quiz so don't start it until you are prepared to take it. That means you've given yourself enough time and have a pencil and paper ready because you'll be working out quite a few problems. You should also have all of the text-based lectures and charts printed out. This will be much easier with the charts available. You'll also be given the exact same subnetting questions again once you learn the simple subnetting method that will be introduced in the next section.That way you can compare the two methods and decide which one works best for you.

Subnetting IP Quiz
16 questions

Watch as I work through all of the questions on the quiz.

Quiz Explanation
10:23
+
Simple Subnetting
3 Lectures 23:30

Learn my simple subnetting method. 

Simple Subnetting
07:28

This is a section from the CCNA textbook I was writing for a book publisher, but never finished because I was promoted, had to move, and couldn't meet deadlines. The video lectures contained in this section are based upon the content here. Think of this as your textbook and the video lectures as a traditional classroom lecture. Learn my simple subnetting method. 

Simple Subnetting
02:43

These are the same subletting problems from the last quiz, but it's time to use the simple subnetting method. 

Simple Subnetting Quiz
9 questions

Watch as I work through all of the questions on the quiz.

Quiz Explanation
13:19
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Other Useful Information
3 Lectures 05:50

You'll probably come across this if you are subnetting. 

Classless Interdomain Routing (CIDR)
02:45

Classless Interdomain Routing (CIDR) is a classless way of routing IP addresses that has replaced the normal expression of IP addresses and subnet masks. You'll probably come across this if you are subnetting.

Classless Interdomain Routing (CIDR)
00:22

Did you learn all of the other useful information?

Other Useful Information Quiz
3 questions

Quiz Explanation
02:43
+
Case Problems - Part 2
10 Lectures 17:03

Network administrators face a number of subnetting challenges. In this problem, you will be presented with a common, but simple subnetting exercise.

Case Problem 7: Auto Parts Manufacturer
00:41

Network administrators face a number of subnetting challenges. In this problem, you will be presented with a common, but simple subnetting exercise. SOLUTION.

Case Problem 7: Solution
04:31

Network administrators face a number of subnetting challenges. In this problem, you will be presented with a common, but simple subnetting exercise.

Case Problem 8: Mortgage Brokerage
00:43

Network administrators face a number of subnetting challenges. In this problem, you will be presented with a common, but simple subnetting exercise. SOLUTION.

Case Problem 8: Solution
03:10

Network administrators face a number of subnetting challenges. In this problem, you will be presented with a common, but simple subnetting exercise.

Case Problem 9: A Large Corporation
00:26

Network administrators face a number of subnetting challenges. In this problem, you will be presented with a common, but simple subnetting exercise. SOLUTION.

Case Problem 9: Solution
02:01

Network administrators face a number of subnetting challenges. In this problem, you will be presented with a common, but simple subnetting exercise.

Case Problem 10: A Client Organization
00:29

Network administrators face a number of subnetting challenges. In this problem, you will be presented with a common, but simple subnetting exercise. SOLUTION.

Case Problem 10: Solution
02:32

Network administrators face a number of subnetting challenges. In this problem, you will be presented with a common, but simple subnetting exercise.

Case Problem 11: Another Client Organization
00:34

Network administrators face a number of subnetting challenges. In this problem, you will be presented with a common, but simple subnetting exercise. SOLUTION.

Case Problem 11: Solution
01:55
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Conclusion
1 Lecture 00:58

This video contains a conclusion to the course. Now it's time for you to start subnetting.

Conclusion
00:58
About the Instructor
Ric Smolenski
4.4 Average rating
81 Reviews
2,807 Students
5 Courses
College Instructor, IT Director, Certification Collector

My name is Ric and I'm an Information Technology Geek. It all started when I got my first computer, an Atari 600XL when I was about 12 years old (it was new back then). I've since went on to become the Director of Technology for an international oil and gas company and then a college instructor and dean.  

I enjoy teaching and my students are a priority. I've taught and developed college courses since 2003 in subjects including Linux, UNIX, Windows, MS Office, Game Development, Web Server Administration, Network Security, Internetworking, Cisco Routing, Cisco Advanced Routing, Cisco Switching, Career Development, and even Mathematics. I've also been a peer reviewer for IT textbooks published by both Cengage Learning and McGraw-Hill. 

I currently hold or have held the following certifications: Certified Scrum Master, Titanium Certified Application Developer, i-Net+, A+, Network+, Security+, Certified Novell Administrator, Certified Novell Engineer, Master Certified Novell Engineer, Cisco Certified Network Associate, and Microsoft Certified Professional. Okay, so those Novell ones don't mean so much now, but they were a lot of work so I'm including them :)