Question 1

What are Class A, B, and C IP addresses?

Accepted Answer

Class A IP range: 1.0.0.0-126.255.255.255, subnet mask 255.0.0.0, for large networks. Class B: 128.0.0.0-191.255.255.255, mask 255.255.0.0, for medium networks. Class C: 192.0.0.0-223.255.255.255, mask 255.255.255.0, for small networks.

Question 2

What is CIDR notation?

Accepted Answer

CIDR (Classless Inter-Domain Routing) uses slash notation, e.g., 192.168.1.0/24, where the number after the slash indicates the number of bits in the network prefix, i.e., the number of 1s in the subnet mask.

Question 3

What is the difference between private and public IP addresses?

Accepted Answer

Private IP addresses (e.g., 10.x.x.x, 172.16-31.x.x, 192.168.x.x) are used only within local networks and cannot be routed on the internet. Public IP addresses are globally unique and used for internet communication.

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