Private vs public IP addresses in Computer Networks - Quick Revision & Key Differences

Recall & Review

beginner

What is a public IP address?

A public IP address is an IP address that is assigned to a device to be accessible over the internet. It is unique worldwide and allows devices to communicate across the global network.

beginner

What is a private IP address?

A private IP address is used within a private network, like a home or office. It is not unique globally and cannot be accessed directly from the internet.

beginner

Name one key difference between private and public IP addresses.

Public IP addresses are unique and reachable from the internet, while private IP addresses are used only inside local networks and are not reachable from the internet directly.

intermediate

Why do private IP addresses help improve security?

Private IP addresses are hidden from the internet, so devices using them are protected from direct external access, reducing the risk of attacks.

beginner

Which IP address type is assigned by your Internet Service Provider (ISP)?

The ISP assigns a public IP address to your home or business router to connect to the internet.

Which IP address can be accessed directly from the internet?

A Public IP address

B Private IP address

C Both public and private IP addresses

D Neither public nor private IP addresses

Only public IP addresses are reachable directly from the internet.

Which of the following is a private IP address range?

A 192.168.0.0 to 192.168.255.255

B 8.8.8.8 to 8.8.8.255

C 172.32.0.0 to 172.32.255.255

D 1.1.1.1 to 1.1.1.255

192.168.x.x is a common private IP address range used in local networks.

Why do devices in a home network use private IP addresses?

A To connect directly to the internet

B To save public IP addresses and improve security

C Because private IPs are faster

D To avoid using any IP addresses

Private IPs help conserve public IPs and protect devices from direct internet access.

Who assigns public IP addresses?

A Home users

B Local network routers

C Device manufacturers

D Internet Service Providers (ISPs)

ISPs assign public IP addresses to connect devices to the internet.

Can two different private networks use the same private IP addresses?

A Only if they use different routers

B No, private IPs must be unique worldwide

C Yes, because private IPs are not unique globally

D Only if they are connected to the same internet

Private IP addresses can be reused in different private networks since they are not visible on the internet.

Explain the difference between private and public IP addresses and why each is important.

Think about how devices connect inside a home versus on the internet.

Describe how private IP addresses contribute to network security.

Consider what happens when a device is not visible on the internet.