40 Asked CCNA Interview Questions and Answers (2024)

Ques 1. What is the purpose of the BGP (Border Gateway Protocol)?

BGP is an exterior gateway protocol used for routing between different autonomous systems. It is critical for Internet routing.

Ques 2. Explain the purpose of ARP poisoning in network security.

ARP poisoning is a method used by attackers to associate their MAC address with the IP address of another device, leading to traffic interception.

Ques 3. What is the purpose of a proxy server in networking?

A proxy server acts as an intermediary between clients and servers, forwarding requests and responses. It is often used for security and caching.

Ques 4. Explain the difference between half-duplex and full-duplex communication.

Half-duplex communication allows data transmission in both directions, but not simultaneously. Full-duplex communication allows simultaneous two-way data transmission.

Ques 5. What is the purpose of the ICMP Echo Request and Echo Reply messages?

ICMP Echo Request and Echo Reply messages are used for ping tests to check network connectivity and measure round-trip time.