CCNA Interview Questions and Answers
Freshers / Beginner level questions & answers
Ques 1. What is the purpose of ARP (Address Resolution Protocol)?
ARP is used to map a 32-bit IP address to a MAC address on a local network, allowing communication between devices.
Ques 2. What is the role of a router in a network?
A router connects different networks and directs data between them based on IP addresses. It operates at the network layer (Layer 3) of the OSI model.
Ques 3. Explain the purpose of ICMP (Internet Control Message Protocol).
ICMP is used to send error messages and operational information about network conditions. It is commonly used for troubleshooting.
Ques 4. Explain the purpose of the DHCP (Dynamic Host Configuration Protocol).
DHCP dynamically assigns IP addresses to devices on a network, simplifying network configuration and management.
Ques 5. What is the purpose of the subnet mask in networking?
The subnet mask defines the network and host portions of an IP address. It is used in conjunction with IP addresses for routing and addressing purposes.
Ques 6. What is the difference between static routing and dynamic routing?
Static routing requires manual configuration of routes, while dynamic routing protocols automatically adapt to changes in the network topology.
Ques 7. 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 8. 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.
Ques 9. What is the purpose of a firewall in network security?
A firewall monitors and controls incoming and outgoing network traffic based on predetermined security rules, preventing unauthorized access.
Ques 10. What is the purpose of the NTP (Network Time Protocol) in networking?
NTP is used to synchronize the clocks of devices on a network, ensuring accurate timekeeping for various applications and services.
Ques 11. Explain the purpose of the MAC address in networking.
The MAC address is a unique identifier assigned to a network interface card (NIC) to enable communication within a network segment.
Most helpful rated by users:
- What is the purpose of ARP (Address Resolution Protocol)?
- Explain the purpose of the DHCP (Dynamic Host Configuration Protocol).
- What is the role of a router in a network?
- What is the purpose of the subnet mask in networking?
- What is the difference between static routing and dynamic routing?
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