Local console access
This lesson begins our journey to learning the different device management protocols. We discuss accessing a Cisco device through the local console port and the different console types and cables.
What is VLSM?
To understand what Variable Length Subnet Masking (VLSM) is, let's go through a business example. Suppose a company has bought the IP address range 37.1.1.0/24 (256 addresses). The company has 5 offices, as shown in figure 1 below:
Predictability Approach (without binary math)
In the previous two lessons, we have seen how to find the subnet ID and the broadcast address of a given IP/mask. If you have done most practice examples, you probably noticed that certain patterns repeat themselves.
QUIZ 2.1- Test your skills on IP Subnetting
This section ends with a Quiz that is designed to give you feedback on your progress. If you have a low score, consider retaking all lessons in this section. If you pass with a high score, go to the next section and continue toward achieving your goal.
The quiz takes only 5 minutes! Good Luck!
Finding the Subnet ID
Understanding the Subnet ID concept (also called the Network ID) is essential for network administrators, as it is used almost everywhere within the networking realm. For example, routing tables show the routes based on subnet id and mask.
What is Subnetting?
This lesson explains what IP subnetting is through a visual example. Suppose a company has a block of 256 public IP addresses provided by the local service provider.
The Subnet Mask
In the first lesson of this course, we saw why we need subnetting in the first place. In this lesson, we will see why we need the netmask and its role in the subnetting process.
Converting IP addresses into Binary
In this lesson, we will learn a technique called the positional notation method. The value of each digit in a binary number is determined by its position in the table. The sum of all these column values for each digit gives the decimal representation of the binary number.
Why do we need IP Subnetting?
In this lesson, we will begin our discussion on IPv4 addressing and subnetting. We will see why we need to subdivide classful IP networks into subnets.
Ethernet Fundamentals
Master Ethernet and VLANs for CCNA. Learn switching, trunking, ARP, and LAN design with simple lessons, diagrams, and real Cisco configuration labs.