CCNA Interview Questions and Answers
Experienced / Expert level questions & answers
Ques 1. What is subnetting and why is it used?
Subnetting is the process of dividing a network into sub-networks to improve performance and security. It helps manage IP addresses more efficiently.
Ques 2. What is NAT (Network Address Translation) and why is it used?
NAT allows multiple devices on a local network to share a single public IP address, providing security and conserving IP addresses.
Ques 3. What is STP (Spanning Tree Protocol) and why is it important?
STP prevents loops in Ethernet networks by blocking redundant paths. It ensures a loop-free topology and rapid convergence in case of link failures.
Ques 4. What is OSPF (Open Shortest Path First) and how does it work?
OSPF is a link-state routing protocol that calculates the shortest path to a destination based on a SPF (Shortest Path First) algorithm.
Ques 5. What is the purpose of the EIGRP (Enhanced Interior Gateway Routing Protocol)?
EIGRP is a Cisco proprietary routing protocol that uses a composite metric based on bandwidth, delay, reliability, and load to determine the best path.
Ques 6. Explain the concept of VLSM (Variable Length Subnet Masking).
VLSM allows the use of different subnet mask lengths in the same IP network, optimizing IP address allocation.
Ques 7. 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 8. 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 9. Explain the concept of GRE (Generic Routing Encapsulation).
GRE is a tunneling protocol that encapsulates a wide variety of network layer protocols inside point-to-point connections.
Ques 10. Explain the role of the OSI model's Session layer.
The Session layer manages sessions (connections) between applications. It establishes, maintains, and terminates communication sessions.
Ques 11. Explain the concept of CIDR (Classless Inter-Domain Routing).
CIDR is a method of allocating IP addresses and routing IP packets based on variable-length subnet masking, improving the efficiency of address space usage.
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?
Related interview subjects
| CCNA interview questions and answers - Total 40 questions |