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Table of contents
1.
Introduction
2.
Most Asked CCNA Interview Questions and Answers
2.1.
1. Define networking.
2.2.
2. How do network devices communicate with each other?
2.3.
3. Define protocols.
2.4.
4. What is a switch in networking?
2.5.
5. Define data packet.
2.6.
6. What is the use of routers in networking?
2.7.
7. What is a hub in networking?
2.8.
8. Define the OSI model.
2.9.
9. How many layers are there in the OSI model?
2.10.
10. How many ports are there in switches? Name them.
2.11.
11. How do routers work in a network?
2.12.
12. What are the functions of routing?
2.13.
13. How can network connectivity issues troubleshooting?
2.14.
14. What is the difference between protocols and data packets?
2.15.
15. How is a half-duplex different from a full duplex?
2.16.
16. How switches and hubs are different from each other?
2.17.
17. What is the IP address and size of it?
2.18.
18. What is the default size of the Maximum Transmission unit for Ethernet networks?
2.19.
19. Which are the first and last layers of the OSI model?
2.20.
20. Define VLAN and its use.
2.21.
21. How are LAN, WAN, and MAN different from each other?
2.22.
22. What is the meaning of MTU? What is its use?
2.23.
23. How are static, default, and dynamic routes are different from each other?
2.24.
24. What are the benefits of VLAN?
2.25.
25. Which is the fourth layer of the OSI model? And why it is used?
2.26.
26. What is the difference between the first and second layers of the OSI model?
2.27.
27. What is the use of the application layer?
2.28.
28. What is the role of the fifth layer in the OSI model?
2.29.
29. How is TCP different from UDP?
2.30.
30. How will you define subnet? What are their uses?
2.31.
31. What do you mean by EIGRP? Mention some metrics of EIGRP Protocol.
2.32.
32. What is CDP? Write its functions.
2.33.
33. What do you mean by a broadcast domain and a collision domain?
2.34.
34. Explain BootP.
2.35.
35. What do you mean by route poisoning?
3.
Frequently Asked Questions
3.1.
What are the 3 modules of CCNA?
3.2.
Which CCNA is current?
3.3.
What is CCNA types?
3.4.
Does CCNA require coding?
4.
Conclusion
Last Updated: Jun 12, 2024
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Top CCNA Interview Interview Questions (2024)

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Introduction

Welcome to our comprehensive blog on CCNA (Cisco Certified Network Associate) Interview Questions. CCNA certification, offered by Cisco, is a globally recognized credential for individuals seeking proficiency in networking fundamentals. 

CCNA Interview Questions

In this article, we will discuss about ccna. We will also be discussing ccna interview questions. We will see questions on each category that is easy, medium, and hard. CCNA stands for Cisco Certified Network Associate. This is an information technology certification that is provided by Cisco. This certification majorly focuses on enhancing your knowledge of networking. If you want your professional roles as a network administrator, network specialist, and network engineer, then this certification is best for you. Moving forward, let’s discuss easy-level ccna interview questions.

Most Asked CCNA Interview Questions and Answers

1. Define networking.

Networking can be defined as computing devices that are connected together and can easily share resources and exchange information between them.

2. How do network devices communicate with each other?

The network devices communicate with each other by using a set of system rules. These system rules are called communication protocols.

3. Define protocols.

Protocols are defined as rules basis on which the transmission of data and resources takes place between interconnected computer devices.

4. What is a switch in networking?

A switch can be defined as a hardware device that allows connecting various devices within a network. 

5. Define data packet.

A data packet can be defined as the basic unit of information. The unit of information can be transferred throughout the network.

6. What is the use of routers in networking?

Routers in networking allow transferring data packets to their right place. They allow connecting more than one network together. The flow of information between network devices is managed by routers.

7. What is a hub in networking?

A hub can be defined as a device that allows connecting various other devices together in a network.

8. Define the OSI model.

The OSI model stands for Open Systems Interconnection Model. It can be defined as a model that allows systems to communicate with each other with the help of standard protocols. The OSI model is made by ISO(International Organization for Standardization).

9. How many layers are there in the OSI model?

There are seven layers in the OSI model. These are as follows.

  • Physical Layer
     
  • Data Link Layer
     
  • Network Layer
     
  • Transport Layer
     
  • Session Layer
     
  • Presentation Layer
     
  • Application Layer


10. How many ports are there in switches? Name them.

There are two ports in switches. These are as follows.

  • Access Port: It only carries traffic for a single VLAN.
     
  • Trunk Port: It carries traffic for multiple VLANs.

11. How do routers work in a network?

Routers work in such a way that they focus on looking for information using IP addresses. Then routers allow computing devices to request files or information from the server by accessing the internet. Then, routers make sure that the requested file or information must be received at the device that requested it.


12. What are the functions of routing?

There are many functions of routing in networking. A few of them are as follows.

  • Routing allows computer networks in sending and receiving information.
     
  • Routing helps in connecting more than one device to connect to the internet.
     
  • With the help of routing, we can easily configure network ports.


13. How can network connectivity issues troubleshooting?

There are many ways of troubleshooting issues in network connectivity. A few of them are as follows.

  • We can check whether physical connectivity is proper or not. The physical connections include switches, cables, hubs, routers, and so on.
     
  • We must check whether the device configuration is correct or not. The device configuration includes IP addresses, DNS servers, and so on.
     
  • We can check for security issues as well. This includes checking firewalls, MAC address filtering, and so on.


14. What is the difference between protocols and data packets?

The difference between protocols and data packets is as follows.

  • Protocols: Protocols are defined as rules basis on which the transmission of data and resources takes place between interconnected computer devices.
     
  • Data Packets: A data packet can be defined as the basic unit of information. The unit of information can be transferred throughout the network.


15. How is a half-duplex different from a full duplex?

The half and full duplex defines the modes of communication in networking. The half-duplex allows transferring of data in only one direction at a time. This means that other devices can only receive data while one is transferring and vice versa. Whereas the full duplex allows transferring of data in both directions at the same time. This means that two devices can transfer and receive data at the same time.


16. How switches and hubs are different from each other?

The switch and hub are the devices that are used in networking for connecting devices. A switch can be defined as a hardware device that allows connecting various devices within a network. Whereas a hub can be defined as a device that allows connecting various other devices together in a network.


17. What is the IP address and size of it?

The IP address stands for Internet Protocol address. It helps in identifying and locating any network device. The size of the IP addresses is as follows.

  • 32-bit for internet protocol version 4(IPv4)
     
  • 128-bit for internet protocol version 6(IPv6).


18. What is the default size of the Maximum Transmission unit for Ethernet networks?

The default size of the maximum transmission unit size for Ethernet networks is 1500 bytes. The maximum size includes header and payload. We can adjust this value accordingly for different network devices. Adjusting MTU size is important as it helps in optimizing the performance of the networks.

19. Which are the first and last layers of the OSI model?

The first and last layers of the OSI model are the Physical layer and the Application layer. The physical layer helps in defining the connection between any device and its transmission medium. This layer consists of voltages, hubs, adapters, and so on. Whereas, the main use of application layer is that it assures that application must be communicating with other applications very easily. This takes place even in different systems and networks. 

20. Define VLAN and its use.

The VLAN stands for Virtual Local Area Network. This network allows connecting more than one device and network that are from different LANs. VLAN is used to group together devices securely. It manages traffic between devices and networks and increases network performance.

21. How are LAN, WAN, and MAN different from each other?

The LAN, WAN, and MAN are different from each other as follows.

  • LAN: LAN stands for Local Area Network. LAN allows connecting computers and network devices with each other. It allows connecting within the same building. 
     
  • WAN: WAN stands for Wide Area Network. WAN allows connecting various computer devices. WAN allows connecting computers over large areas. 
     
  • MAN: MAN stands for Metropolitan Area Network. MAN allows connecting networks widely. The networks can be connected within various buildings but in the same area.


22. What is the meaning of MTU? What is its use?

The MTU stands for Maximum Transmission Unit. It is used during transmission. It allows determining the maximum size of the data packet. The default size of the maximum transmission unit size for Ethernet networks is 1500 bytes. We can adjust this value accordingly for network devices. Adjusting MTU size is important as it helps in optimizing the performance of the networks.


23. How are static, default, and dynamic routes are different from each other?

The static, default, and dynamic routes are different from each other as follows.

  • Static Route: The static route is a route on which a data packet is required to move in order to reach any particular network.
     
  • Default Route: The default route is helpful when there is no exit point. This route especially helps when for an IP packet, the switch is unable to find any match in the routing table.
     
  • Dynamic Route: The dynamic route is used to exchange data between routers. This route also helps in finding the optimal ways that network devices can have between them.


24. What are the benefits of VLAN?

There are many benefits of VLAN. A few of them are as follows.

  • VLAN network is a secured network.
     
  • The cost of VLAN is also lower.
     
  • Managing VLAN is easy.
     
  • The performance of VLAN is good.


25. Which is the fourth layer of the OSI model? And why it is used?

The fourth layer of the OSI model is the transport layer. The main use of this layer is to transfer data. The data is transferred between end users. This layer is built when the IP session for communication beings or ends. The transport layer controls the flow of information and ensures that the information is transferred efficiently and smoothly.


26. What is the difference between the first and second layers of the OSI model?

The first layer of the OSI model is the physical layer. Whereas the second layer of the OSI model is the data link layer. 

  • Physical Layer: The physical layer helps in defining the connection between any device and its transmission medium. This layer consists of voltages, hubs, adapters, and so on.
     
  • Data Link Layer: The data link layer allows transferring of data between networks. This transmission takes place by means of functional and procedural. This layer is useful as it can detect errors that may or may not occur in the physical layer. This layer can also correct those detected errors in most cases.


27. What is the use of the application layer?

The application layer is the seventh and the last layer in the OSI model. The main use of this layer is that it assures that application must be communicating with other applications very easily. This takes place even in different systems and networks. While communicating, one application can send files to other applications easily. This layer interacts with all the lower six layers of the OSI model. It checks whether the transmission of information is appropriate or not.


28. What is the role of the fifth layer in the OSI model?

The fifth layer in the OSI model is the session layer. This layer is responsible for controlling and managing the connections between computer systems. The session layer can also terminate the connections between applications. This layer manages the flow and duration of the connection. The session layer also uses a checkpoint mechanism, which is helpful in recovering the information in case of network faults.


29. How is TCP different from UDP?

The differences between TCP and UDP are as follows.

TCPUDP
The Transmission Control Protocol(TCP) allows transferring of information between source and destination and guarantees information delivery in the correct order.The User Datagram Protocol(UDP) allows transferring of information between source and destination but does not guarantee information delivery and correct order.
In TCP, before the transfer of information, a connection is built between the source and destination.In UDP, there is no prior connection built between the source and destination.
TCP is slower as compared to UDPUDP is more speedy and efficient than TCP
TCP checks before transferring a large amount of data from source to destination. To control the flow of too much data.UDP does not follow any flow control mechanism like TCP.


30. How will you define subnet? What are their uses?

The subnet is the combination of the words sub and network. The sub-network can be defined as subdivided pieces of any large network. The subnet is used to divide domains in order to route traffic efficiently. There are many uses of the subnet. A few of them are as follows.

  • Subnet improves the performance of the network.
     
  • Subnet helps in routing traffic efficiently.
     
  • A subnet reduces the load on a network.
     

31. What do you mean by EIGRP? Mention some metrics of EIGRP Protocol.

EIGRP stands for Enhanced Interior Gateway Routing Protocol which is a dynamic routing protocol that is used to find the best path between the two-layer 3 devices so that the packet can be delivered. Here are some metrics of the EIGRP protocol:

  • Bandwidth: The capacity of a link in kilobytes per second (kbps)
     
  • Load: This represents the current load of the link; the value of the load can be varied from 0 to 255
     
  • Delay: Delay represents the time a packet will take to traverse the link
     
  • Reliability: It represents the reliability of the link
     
  • MTU: MTU stands for Maximum Transmission Unit
     

In the above metric, bandwidth, and load are used by default.

Also read: Manual testing interview questions

32. What is CDP? Write its functions.

CDP stands for Cisco Discovery Protocol is a layer 2 Cisco network protocol that helps in inspecting the devices connected to the network efficiently. Here are some functions of CDP:

  • CDP assists in troubleshooting TPV(Type Length Values) fields
     
  • CDP also detects the IP address of a wrongly configured switch/router on the other side of a WAN link.
     
  • CDP allows the use of RTP (Real-Time Transport Protocol) and different network-layer protocols to locate the devices and tell how they are configured.
     
  • CDP also contains the version of IOS software and hardware capabilities.
     

33. What do you mean by a broadcast domain and a collision domain?

A broadcast domain is a scenario that can be created when devices send a broadcast message; all the other devices which are included in the broadcast have to pay attention to it. 

A collision domain is a scenario that can be created when a device sends out a message to the network; all other devices which are included in its collision domain have to pay attention to it.

34. Explain BootP.

BootP stands for Bootstrap Protocol which is a network protocol that can be used by the networking administration to give IP addresses to a member of that network for participating with other networking devices by the main server.

35. What do you mean by route poisoning?

Route Poisoning is a method that basically prevents a network from sending the data packets to a path destination that has already become invalid. Routing Protocol is done when Distance Vector Routing Protocol sees an invalid router.

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Frequently Asked Questions

What are the 3 modules of CCNA?

There are total three modules of CCNA, which are the following: first is, Introduction to Networks; second is, Enterprise Networking, Security and Automation, and third is, Switching, Routing, and Wireless Essential.

Which CCNA is current?

There is only one single CCNA exam, and the latest exam's code is 200-301 CCNA. Here are some of the core topics of this version: Network Fundamentals, Network Acess, IP Connectivity, IP Services, Security Fundamentals, etc.

What is CCNA types?

CCNA has various specializations, such as CCNA Routing and Switching, CCNA Security, and CCNA Data Center, catering to different aspects of networking.

Does CCNA require coding?

CCNA primarily focuses on networking concepts and configurations, not coding. However, a basic understanding of scripting languages like Python can be beneficial for network automation tasks.

Conclusion

In this article, we have discussed about CCNA interview questions. This blog of CCNA Interview Questions serves as a valuable resource for individuals aspiring to excel in networking interviews. Covering a spectrum of topics, from fundamental networking principles to Cisco device configurations, these questions offer insights into the diverse skills demanded by the CCNA certification. To learn more, you can check out our other articles:

We hope this article helped you in learning ccna interview questions. You can read more such articles on our platform, Coding Ninjas Studio. You will find articles on almost every topic on our platform. Also, you can practice coding questions at Coding Ninjas to crack good product-based companies. For interview preparations, you can read the Interview Experiences of popular companies

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