Cara Lain Menentukan Prefix yang Efektif | Tutorial Belajar Online Lengkap CISCO CCNA 200-301 Part 9

Summary

This video tutorial explains how to determine the most effective subnet prefix for a computer network. Using examples of networks with 60 and 100 PCs, the video demonstrates the process of calculating subnet sizes based on powers of 2. It walks viewers through the method of choosing an appropriate prefix, such as /26 for 60 PCs and /25 for 100 PCs. The focus is on using IP addressing efficiently by understanding subnetting and applying the powers of 2 to find the right prefix. The video concludes with a promise of further subnetting lessons in future videos.

Takeaways

• 😀 Understanding how to calculate the effective prefix for a network is crucial for network design.
• 😀 The calculation involves using powers of 2 to determine the required number of IP addresses for a given number of PCs.
• 😀 Powers of 2 are used to represent the available number of addresses in a network: 2^1 = 2, 2^2 = 4, 2^3 = 8, etc.
• 😀 For a network with 60 PCs, the most effective prefix is /26, since 2^6 (64 addresses) is sufficient.
• 😀 For a network with 100 PCs, the effective prefix is /25, as 2^7 (128 addresses) provides enough space.
• 😀 To find the appropriate prefix, subtract the exponent from 32. For example, 32 - 6 = /26, and 32 - 7 = /25.
• 😀 It's important to understand subnetting and how to choose the correct number of available addresses based on network size.
• 😀 The process for determining the prefix can be applied to any network size, ensuring optimal address allocation.
• 😀 The instructor emphasizes the importance of practicing these calculations to ensure accuracy when designing networks.
• 😀 Future lessons will delve deeper into subnetting, providing further tools and techniques for network management.

Q & A

What is the purpose of the video discussed in the transcript?

The purpose of the video is to teach how to determine the most effective network prefix for a given number of computers in a network.

How are powers of 2 used to calculate the most effective prefix?

Powers of 2 are used to determine the total number of IP addresses available for a network. The exponent of 2 that is greater than or equal to the required number of IPs is selected. The prefix is then calculated by subtracting the exponent from 32.

What is the first example given in the video?

The first example involves a network with 60 PCs, and the video explains how to calculate the most effective prefix for this network.

How does the speaker suggest calculating the effective prefix for 60 PCs?

For 60 PCs, the speaker calculates that 64 IP addresses (2^6) are needed. By subtracting 6 (the exponent) from 32, the most effective prefix is /26.

What is the second example given in the video?

The second example involves a network with 100 PCs, and the video explains how to calculate the most effective prefix for this network.

How is the most effective prefix calculated for 100 PCs?

For 100 PCs, the speaker calculates that 128 IP addresses (2^7) are needed. By subtracting 7 (the exponent) from 32, the most effective prefix is /25.

Why is 2^6 not enough for a network with 60 PCs?

2^6 provides only 64 IP addresses, which is enough for 60 PCs, but 2^5 (32 IP addresses) would not be sufficient for 60 PCs.

What happens if a higher power of 2 is selected than necessary?

Selecting a higher power of 2, such as 2^8 (256 IPs), would result in wasted IP addresses because it provides far more IPs than needed for 60 or 100 PCs.

What is the significance of the formula '32 minus the exponent' in this context?

The formula '32 minus the exponent' is used to calculate the network prefix. This ensures that the prefix size matches the required number of IP addresses for the network.

What other topics will the speaker cover in future videos?

The speaker mentions that future videos will cover subnetting in more detail, building on the concepts introduced in this video.