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Home / Interview Subjects / CCNA
WithoutBook LIVE Mock Interviews CCNA Related interview subjects: 1

Interview Questions and Answers

Know the top CCNA interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Total 40 questions Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before interview

Know the top CCNA interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Freshers / Beginner level questions & answers

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.
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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.
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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.
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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.
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Intermediate / 1 to 5 years experienced level questions & answers

Ques 13

Explain the difference between TCP and UDP.

TCP (Transmission Control Protocol) is connection-oriented, ensuring reliable data delivery. UDP (User Datagram Protocol) is connectionless and provides faster, but less reliable, data transmission.
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Ques 15

What is the difference between a hub, switch, and router?

A hub operates at the physical layer, a switch at the data link layer, and a router at the network layer. Routers connect networks, switches forward data within a network, and hubs broadcast data to all connected devices.
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Ques 18

What is the difference between a collision domain and a broadcast domain?

A collision domain is a network segment where collisions can occur, typically in Ethernet networks. A broadcast domain is a logical division of a network, where broadcasts are confined.
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Ques 20

Explain the concept of QoS (Quality of Service) in networking.

QoS ensures that network traffic is prioritized based on specific criteria, such as bandwidth, latency, and packet loss, to meet performance requirements.
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Ques 21

What is the purpose of ACLs (Access Control Lists) in routing?

ACLs control traffic flow by permitting or denying packets based on defined rules. They are commonly used for security and traffic filtering.
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Ques 23

What is the purpose of the HSRP (Hot Standby Router Protocol)?

HSRP provides high availability by allowing multiple routers to work together in a group, with one router acting as the active router and the others as standby routers.
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Ques 24

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.
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Ques 26

What is the purpose of the Hubs and Spokes topology in networking?

Hubs and Spokes topology is a network design where multiple remote sites (spokes) are connected to a central site (hub) for efficient communication.
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Ques 27

What is the purpose of SNMP (Simple Network Management Protocol)?

SNMP is used for managing and monitoring network devices. It allows the retrieval of information and the configuration of network components.
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Experienced / Expert level questions & answers

Ques 32

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.
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Ques 33

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.
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Ques 34

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.
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Ques 37

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.
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Ques 40

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.
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