Menentukan Prefix yang Paling Efektif | Tutorial Belajar Online Lengkap CISCO CCNA 200-301 Part 8

Summary

This video explains the basics of subnetting, focusing on how to calculate the most efficient IP prefix for a network. Using an example with 12 PCs, the speaker shows how to determine the right subnet by calculating the number of IPs available in different prefixes. Emphasizing an easy approach over complex binary conversion, viewers learn that a slash-28 prefix (16 IPs) is ideal for a network with 12 PCs. The video provides a simple method for beginners to understand subnetting before progressing to more advanced topics.

Takeaways

• 😀 Subnetting helps determine the most efficient use of IP addresses for network traffic.
• 😀 A prefix in an IP address determines how many bits are allocated for the network part, with the remaining bits used for host addresses.
• 😀 An example of a prefix is /24, which gives 256 IP addresses (2^8).
• 😀 The formula for calculating the number of available IP addresses is 2^(32 - prefix).
• 😀 The /24 prefix gives 256 IPs, the /30 prefix gives 4 IPs, and the /29 prefix gives 8 IPs.
• 😀 Subnetting calculations can be simplified by remembering the pattern in powers of 2: 2^1 = 2, 2^2 = 4, 2^3 = 8, and so on.
• 😀 For a network with 12 PCs, the most efficient prefix is /28, providing 16 IP addresses.
• 😀 The process for determining the most effective prefix involves checking the number of IPs needed and comparing them to available options.
• 😀 The /28 prefix is ideal for networks with 12 devices, as it provides more than enough IP addresses with some left over.
• 😀 This video simplifies subnetting concepts, focusing on practical examples rather than complex binary calculations.

Q & A

What is the main objective of learning subnetting in networking?

The main objective of learning subnetting is to determine the most effective traffic usage for a network by calculating the number of IP addresses needed and selecting the appropriate prefix (subnet mask).

How do we calculate the number of IP addresses for a given prefix length?

To calculate the number of IP addresses, subtract the prefix length from 32 (since an IP address is 32 bits). Then calculate 2 raised to the power of the remaining bits. For example, for a /24 prefix, 32 - 24 = 8, and 2^8 = 256 IP addresses.

What does a /24 prefix represent in terms of available IP addresses?

A /24 prefix represents a total of 256 IP addresses. This is calculated by 2 raised to the power of 8 (because 32 - 24 = 8), giving 256 IP addresses.

How does the prefix /30 calculate to 4 IP addresses?

For a /30 prefix, 32 - 30 = 2, so the number of IP addresses is 2^2, which equals 4 IP addresses.

What is the significance of using 2 raised to the power of a number in subnetting?

In subnetting, using 2 raised to the power of a number helps determine the number of available IP addresses. Each increase in the exponent doubles the number of addresses. For example, 2^3 = 8 and 2^4 = 16.

Why is it important to understand subnetting when setting up a network?

Understanding subnetting is important because it helps in efficiently allocating IP addresses based on the size of the network. This ensures that the network has enough addresses for all devices while minimizing wastage of IPs.

What prefix would be most effective for a network with 12 PCs?

For a network with 12 PCs, a /28 prefix would be the most effective. This gives 16 IP addresses, which is sufficient for the 12 PCs, with some IPs left unused.

How is the pattern for calculating the number of IP addresses explained in the video?

The pattern follows the principle that each increase in the exponent by 1 doubles the number of available IP addresses. For example: 2^1 = 2, 2^2 = 4, 2^3 = 8, and so on.

What is the difference between learning subnetting using binary and the method explained in the video?

Learning subnetting using binary involves converting numbers to binary, which can be more complex and difficult to understand. The method explained in the video uses exponentiation to simplify the process and make it more accessible.

What is the maximum number of IP addresses you can get from a /9 prefix?

A /9 prefix gives 2^23 IP addresses (because 32 - 9 = 23), which equals 8,388,608 IP addresses. However, this is an advanced topic not covered in this video.