IP Public vs IP Private | Tutorial Belajar Online Lengkap CISCO CCNA 200-301 Part 7

Summary

In this video, the presenter explains the differences between public and private IP addresses. Public IP addresses are used on the internet and can be accessed from anywhere, enabling users to connect to websites like Facebook, YouTube, and Google. In contrast, private IP addresses are used within local networks (LANs) and can only be accessed within that network. The video also details the ranges for private IP addresses (10.0.0.0 to 10.255.255.255, 172.16.0.0 to 172.31.255.255, and 192.168.0.0 to 192.168.255.255) and stresses the importance of using private IPs for local networks.

Takeaways

• 😀 Public IPs are used on the internet and can be accessed from anywhere.
• 😀 Private IPs are used within local networks and can only be accessed within that network.
• 😀 Examples of public IP usage include accessing websites like Facebook, YouTube, and Google.
• 😀 Public IPs allow access from any location, whether at home, in the office, or even abroad.
• 😀 A local network, such as an office, uses private IPs for devices like computers, which can't be accessed externally.
• 😀 Private IPs are essential for securing internal communication within local networks.
• 😀 There are three main ranges of private IPs: 10.0.0.0 to 10.255.255.255, 172.16.0.0 to 172.31.255.255, and 192.168.0.0 to 192.168.255.255.
• 😀 IP addresses in the range 10.0.0.0 to 10.255.255.255 are considered private IPs.
• 😀 IPs like 172.35.1.10 or 192.10.10.10 fall outside the defined private ranges and are considered public IPs.
• 😀 When building a local network, ensure the use of private IP ranges to prevent external access to internal devices.

Q & A

What is the main difference between a public IP address and a private IP address?

A public IP address is used on the internet and can be accessed from anywhere, while a private IP address is used within a local network (LAN) and can only be accessed within that network.

Can you provide an example of a public IP address use case?

When you access websites like Facebook, YouTube, or Google, you are connecting to servers that use public IP addresses, enabling you to access them from anywhere, as long as you have internet connectivity.

What are the key characteristics of a public IP address?

A public IP address is used on the internet and can be accessed from any location, making it globally routable. It is essential for accessing online services and servers from different networks.

What role does the router play in connecting a local network to the internet?

The router connects the local network to the internet through an Internet Service Provider (ISP), allowing devices within the local network to access external resources, such as websites, via public IP addresses.

What is a private IP address, and where is it used?

A private IP address is used within a local network (LAN) and is not directly accessible from the internet. It allows devices within the same network to communicate with each other securely without exposure to the public internet.

Can devices with private IP addresses communicate with each other across different networks?

No, devices with private IP addresses can only communicate with other devices within the same local network. They cannot communicate directly with devices in different networks unless translated by a router or firewall using NAT (Network Address Translation).

What is the purpose of subnetting in relation to IP addresses?

Subnetting is the process of dividing a larger network into smaller, more manageable sub-networks (subnets). It helps optimize the use of IP address ranges and improves network performance and security.

How does a private IP address differ from a public IP address in terms of accessibility?

A private IP address can only be accessed within the local network it resides in. In contrast, a public IP address is globally accessible, meaning it can be accessed from any network connected to the internet.

What are the three main IP address ranges designated for private networks?

The three main ranges for private IP addresses are: 1) 10.0.0.0 to 10.255.255.255, 2) 172.16.0.0 to 172.31.255.255, and 3) 192.168.0.0 to 192.168.255.255.

Why can't an IP address like 172.35.1.10 be used in a private network?

The IP address 172.35.1.10 is outside the designated private IP address range (172.16.0.0 to 172.31.255.255), making it a public IP address. It cannot be used within a private network as it is not part of the private IP address range.