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CCNA & Networking Interview Questions and answers

Companies hire certified applicants because CCNA interview questions product owners provide certified professionals at a discount. The most in-demand skill for newcomers and seasoned professionals is network expertise, obtained through the official CCNA certification. Vodafone, Presidio INC, HCL technologies, Wipro, Ericsson, and TCS, are just a few well-known networking companies.

As a requirement for the certification, the employer utilizes the term “CCNA Certified professionals” as a keyword to search in employment portals. Certification is essential for reaching employers and getting a high wage in the existing firm, for which the Live Training with optimal methodology gives success. Students are provided with interview information, simulated interviews, resume writing, interview advice, and interview questions and answers as part of the Job Support program. After gaining valuable experience in the networking field, CCNA experts can master a variety of cloud administration products in high demand throughout the world.

Knowing how to respond to CCNA interview questions effectively will help you convey your expertise and experience to the interviewer, increasing your chances of landing the job.

Best CCNA Interview Questions 

1. What are the different types of CISCO router memories?

During CCNA Interview questions, you can always expect this particular question.

The following are the many types of memories found in a CISCO router:

  • The starting configuration file is stored in NVRAM.
  • The configuration file that is performed is stored in DRAM.
  • The operating system kept on flash memory.

2. Distinguish between User and Privileged Modes.

This difference will indeed find a place amongst the top CCNA Interview questions.

When utilizing a CISCO router, User Mode does routine tasks such as viewing system information, connecting to remote devices, and checking the router’s status. On the other hand, the Privilege model provides all of the settings available in User Mode, plus a few extra. Thus, this mode can be used to configure the router and test and debug it.

3. What does Bandwidth refer to?

This is a common question asked in CCNA Interview questions.

The transmission capacity of a medium is referred to as bandwidth. It is a unit of measurement for the amount of data that a transmission channel can process expressed in Kbps.

4. What exactly are packets?

The outcomes of data encapsulation are packets. These are data that has been wrapped in the OSI layers’ various protocols. Datagrams are another name for packets.

5. What precisely are segments?

Segments are data streams that arrive from the top OSI layers and are transmitted to the network. For example, at the Transport Layer, segments are the logic units.

6. Describe some of the advantages of LAN switching.

Another common CCNA Interview question.

  • Enables data transmission and receiving in full-duplex mode.
  • Adaptation of the media rate
  • Migration is quick and straightforward

7. Briefly describe the data encapsulation conversion steps.

This is frequently asked as one of the CCNA Interview Questions.

Data from the end-user is translated to segments from the perspective of a data transmitter. After that, segments are transferred to the subsequent tiers, transformed into packets or datagrams. Then, before being sent to the network interface, these packets are transformed into frames. Finally, before data transfer, frames are transformed to bits.

8. What are the many types of passwords that can be used to secure a CISCO router?

The encryption method for the router is a very important question in the list of CCNA Interview questions.

There are five different sorts of passwords that you can use. Secret, virtual terminal, console, and auxiliary are all enabled by these.

9. What information can be retrieved in the identifying information of a CISCO router?

The interfaces and the hostname. Your router’s name is the hostname. The router ports are referred to by the Interfaces, which are set configurations.

10. Distinguish between logical and physical topology.

The difference between the topologies is likewise amongst the most notable CCNA interview questions out there.

The signal channel across the physical topology is referred to as logical topology. The actual layout of the network medium is known as the physical topology.

11. When the iOS router is stuck, what command do we provide it?


12. What are the OSI model’s many layers?

In CCNA Interview questions, this is a common one.

The OSI model has seven layers in total. In the OSI model, each layer has its own set of capabilities. They are as follows:

  • Physical is the first layer.
  • Data Link is the second layer.
  • The network is the third layer.
  • Transport is the fourth layer.
  • The session is the fifth layer.
  • Presentation is the sixth layer.
  • Application is the seventh layer.

13. What is the distinction between a switch, a router, and a hub?

The common question asked in CCNA Interview questions.

A switch is utilized to receive the signal that will be used to create a frame. It routes packets between different LAN segments. When data is transferred at a Data Link layer or Network layer of the OSI architecture, it is the platform for packet control. A single broadcast domain and numerous collision domains are supported.

Routers: A router is a networking gateway device that transfers data packets from one computer network to another. A router has at least one LAN with its IP address and LAN or WAN connections. In addition, a router supports two broadcast domains.

Hub: If something arrives in the hub’s port, is forwarded to the others. It is the least priced and most straightforward option. There is only one collision domain and one broadcast domain.

14. What is the difference between a half-duplex and a full-duplex connection?

This difference can be asked as one of the CCNA Interview Questions.

The transmission of information or communication in half-duplex mode is only in one direction.

Consider the walkie-talkie as an example.

Information or communication is transmitted in both directions in full-duplex mode.

Talking on the phone, for example.

15. What is the difference between the broadcast and collision domains?

If a communicated edge is sent, each gadget focuses and receives the information in the shared area. The chances of an information crash are highest in the Collision area. If at least two devices send traffic simultaneously, information will crash in the middle, and none of the devices will receive it.

16. Mention what data packets are made out of.

In CCNA Interview questions, the concept of Data Packet is important.

The sender’s information, the recipient’s information, and the data contained in a data packet make up a data packet. It also includes a numeric identification number that identifies the packet and order number. When data is transferred across the network, it is broken down into data packets. Concisely, data packets include the information and routing configuration for the message being sent. 

17. What are the data encapsulation conversion steps?

The following are examples of data encapsulation conversion steps:

  • The user’s alphanumeric input is translated into data at layers one, two, and three (application/presentation/session).
  • Layer four (Transport): Data is broken down into little chunks.
  • Data is transformed into packets or datagrams, and a network header is appended at Layer 5 (Network).
  • Datagrams or packets are assembled into frames at Layer Six (Data Link).
  • Layer seven (Physical): Bits are transformed into frames.

18. How do you set up a Cisco Router to route IPX traffic?

This is a part of technical CCNA Interviews questions.

The first step in configuring a Cisco router for IPX routing is to enable IPX routing with the command ‘IPX Routing.’ Each IPX network interface is subsequently assigned a network number and an encapsulation mechanism. Standard and Extended IPX access lists are the two types of IPX access lists. Only the source or destination IP address can be filtered using a standard Access List. When filtering a network, an extended access list, on the other hand, employs the source and destination IP addresses, socket, protocol, and port.

Networking Interview Questions

19. What is the definition of networking?

The term “networking” refers to the process of connecting to and operating on a network. The process of establishing and utilizing wired or wireless networks to exchange data, ideas, files, and other forms of electronic communication.

20. What is HTTP, and what is the port number?

A common topic in CCNA Interview Questions.

The Hypertext Transfer Protocol (HTTP) is in charge of web content. Many web pages use HTTP to transport online content and allow Hypertext to be displayed and navigated. TCP port 80 is the major protocol and port used here.

21. What exactly does Protocol imply?

The protocol is described as the set of rules that link two or more devices to send data from one to the other. Knowing how data is transmitted from one network to another for communication purposes is beneficial.

22. What is the definition of network congestion?

This particular question falls under one of the most asked in CCNA interview questions

Network Congestion is the process of a network node carrying more data than the network can handle, resulting in packet or information loss on the network node and the receiver being unable to receive relevant information.

23. What is the difference between a local area network (LAN), a metropolitan area network (MAN), and a wide area network (WAN)?

The most basic concept in networking can be a question in CCNA Interview questions.

A local area network (LAN) is a network that connects computers and network devices, usually within the same area or building. In a LAN, connections must be fast. Ethernet is a good example.

MAN: A metropolitan area network (MAN) is a network that connects several buildings in the same city. The IUB Network is a good example.

A wide area network (WAN) is a network that is not limited to a single company or organization and may be accessed by the public. It connects to some LANs. The WAN connection is both fast and pricey. Consider the Internet.

24. What do the terms Unicast, Multicast, Broadcast, and Anycast mean?

This difference in casting is very important in CCNA Interview Questions.

Unicast refers to the transmission of communications from a single source to a single destination. In Unicast, packets sent from the sender include the receiver’s data address to be delivered straight to the receiver.

Broadcasting is the transmission of messages from one sender to as many recipients as possible. It is just suitable for a local network. Unfortunately, data broadcasting is not possible due to many unrelated and unneeded data on the public internet.

The exchange of messages between one sender and several receivers is known as multicast. The network settings in multicast determine your receiving clients and the type of broadcasting.

Anycast is the transmission of messages from one host to another. TCP and UDP protocols are used. Every host that requests it receives a copy of each data packet.

25. In CCNA, what are the many types of networks?

These basic network type questions can be asked in CCNA Interview Questions.

There are two different kinds of networks:

  • The network is based on servers.
  • Peer-to-peer (P2P) network

26. What is the purpose of PING?

PING is an acronym for Packet Internet Groper. It is used to determine whether a host is reachable via an Internet Protocol (IP) network. When data is delivered over the network using IP addresses, the receiver will PING the sender to receive the data.

27. What are the various types of cables used in cable routing?

Types of cables questions are common in the CCNA Interview Questions.

There are three different types of cables that are utilized:

  • Straight cable (switch-router).
  • Crossover cable (PC-PC, switch-switch).
  • Cable with a rollover (Console port to computer).

28. Describe an Autonomous System (AS).

It might be a single network or a collection of networks controlled by a single directive. It is known as an Autonomous System Number, and a unique number or code (ASN) specifies it. It is also referred to as a routing domain.

Interior Gateway Protocol is used to communicate between networks within an AS (IGP).

29. What is the purpose of using ‘Service Password Encryption’?

This is another one of the frequently asked CCNA Interview Questions.

To encrypt a plaintext password into a type seven password, utilize Service Password Encryption. Because the security is low, it can be easily decoded.

30. What do we look for when setting up the server?

This is a basic but important part of CCNA Interview questions.

The following parameters are verified during configuration:

  • Check to see if the LAN is connected.
  • The root directory should be in NTFS format.
  • For communication, the server should have a static IP address.

31. How can a baud rate and a bit rate be differentiated?

This is a confusing question in CCNA Interview questions.

The bit rate is the total number of bits conveyed in one second, whereas the baud rate is the number of signal units per second needed to represent those bits.

The baud rate is equal to the bit rate divided by the number of bits represented by each signal shift, where N is the number of bits represented by each signal shift. 

32. Define Domain Name System (DNS), and how does it function.

DNS is a service that converts domain names into IP addresses over the internet. Anything connected to the internet has a unique IP address, such as mobile phones, laptops, and websites.

33. Is there a distinction between CSMA/CD and CSMA/CA?

These CCNA Interview questions are very important questions.

CSMA/CD is a media access control mechanism in local area networking. When a collision happens, it uses early Ethernet technology to overcome it.

Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) is utilized to avoid collisions in the wireless network.

34. What are some of the most typical software issues that can result in network flaws?

This is a common question in CCNA Interview questions.

Software-related issues can include any or all of the following:

  • Client-server issues
  • Conflicts between applications.
  • A configuration error has occurred.
  • Misalignment of protocols.
  • There are security concerns.
  • Issues with user policy and privileges.

35. What Is Network Latency?

This is a frequent question in CCNA Interview questions related to networking.

The performance of one device when communicating with another is referred to as network latency. Bandwidth speeds, network card performance, cabling, and congestion all affect network latency. Users may be unable to communicate correctly with programs due to high latency, which will “time out” if latency is too high. 

36. How can a Private IP and a Public IP be differentiated?

Public IP addresses are utilized when routing globally across the internet. They are made available to various websites and businesses for Internet access. They become unique in the world once they are connected to the internet. Private IP addresses, on the other hand, are for personal and local usage only. You cannot send them through the internet. Different organizations may use the same private IP address.

37. What is LAN switching, and how does it work? What are the advantages?

In Local Area Networks, LAN Switching is a type of packet switching. It is an important part of most networks since it improves the overall efficiency of the LAN while also addressing bandwidth difficulties. It allows several users to communicate with one another directly. LAN switching establishes a system of point-to-point connections between two devices at the same time. It offers a collision-free network as well as high-speed connectivity.

LAN Switching has the following advantages:

  • The scalability of the network has improved.
  • The bandwidth performance has improved.
  • At the same time, many connections can be created..
  • Data transmission in full-duplex mode.
  • Improved security and manageability.

38. What does an address mask contain, and how does it function?

This can be put in different ways like function or definition of Address Mask in the types of CCNA Interview Questions.

The network portion of an IP address is identified by an IP address mask. The 32-bit mask designates the matching bit in the IP address as a network bit for each one. A zero in the mask designates the IP address’s corresponding bit as a host bit. All 32 bits of the address and the mask are combined using a Boolean AND; as a result, all network bits of the mask are repeated, and all host bits are set to zero.

Data Link CCNA Interview Questions

39. What is the distinction between error control and flow control?

As the name implies, flow control regulates the rate at which data is transferred to ensure that the receiver receives it efficiently. Error control looks for and corrects faults in data bits and packets.

40. What is data encapsulation, and how does it work?

This is a frequently asked question in CCNA Interview Questions.

Data encapsulation is a procedure that involves adding extra information to each tier of the OSI model when data flows from one host to another. Source and destination addresses, protocol information, data type, and so on.

41. What is the distinction between the MAC and LLC sublayers?

The Media Access Control layer is referred to as the MAC sublayer. Layer 2- Data Link Layer is where the MAC address is used. This layer regulates data transmission permissions.

Logical Link Control Layer (LLC) is a sublayer of the Logical Link Control layer. This layer controls all frame synchronization, flow control, and error checking.

42. Do you understand what a MAC Address is?

MAC (Media Access Control) addresses are globally unique addresses placed into electronics during the manufacturing process. A network adapter’s MAC address is a unique value assigned to it. Hardware addresses and physical addresses are other terms for MAC addresses. They are used to identify an adapter on a local area network (LAN). MAC addresses are hexadecimal numbers with 12 digits (48 bits in length).

43. What is the role of the Data Link Layer, and what are its responsibilities?

This is one of  the most important CCNA Interview questions on Data Link.

  • The Data Link Layer is responsible for node-to-node delivery and transforms the physical layer, which is a raw transmission facility, into a dependable link.
  • Framing is a term used to describe the process of putting together
  • Addressing on a Physical Level.
  • Flow Management.
  • Error Handling
  • Control of access. 

44. What exactly is a virtual private network (VPN)?

The term “virtual private network” refers to a network that makes use of public telecommunications infrastructure. This indicates that the nodes were connected via public wires. Consider the Internet. VPN allows for remote access to computers and data transmission across a public network. Even though the data is sent over a public network, encryption and decryption are used to maintain security.

45. What is the Spanning-Tree Protocol (STP) and how does it work?

This is a frequently asked topic in CCNA Interview Questions.

IEEE 802.11 defines the Spanning-Tree Protocol (STP).

1D is a network link management strategy that enables path redundancy while avoiding network loops. Only one active path between two stations is required for an Ethernet network to function effectively. Loops in networks can occur for a variety of reasons. The most prevalent cause of network loops is a purposeful endeavor to create redundancy – if one connection or switch fails; another link or switch can take over.

46. On a data link, what are the three sources of signal degradation?

Based on the Data Link questions, these are important in CCNA Interview questions.

Attenuation, interference, and distortion are the three sources of signal degradation on a data network. The resistance of the medium determines attenuation. Interference is caused by noise that enters the medium. The reactive qualities of the medium, which react differently to different frequency components of the signal, cause distortion. 

47. What exactly is the Data Link layer, and how does it function? (Data link questions)

In the CCNA Interview questions, you should expect a question like this.

Multiplexing data streams, data frame detection, media access, and the data link layer handles all error control. It allows for dependable point-to-point and point-to-multipoint connections in a communication network.

The Data-Link Layer encapsulates packets from the Network Layer in Frames. Then it transmits each frame to the hardware bit by bit. The data connection layer at the receiver’s end collects signals from hardware and assembles them into frames. Layer-2 hardware addressing is provided by the data-link layer.

48. What does Mac stand for in the data link layer?

The medium access control also known as MAC is the layer of the OSI reference model for data transmission is a sublayer of the data link layer. It is in charge of transmission medium flow regulation and multiplexing. It manages the transfer of data packets through shared channels that are accessible from afar.

49. What types of MAC addresses are there?

This question can also be asked along with MAC in CCNA Interview questions.

The following are the most common MAC addresses:

  • The most common type of MAC address is the Universally Administered Address (UAA). At the time of manufacture, it is given to the network adapter.
  • Locally Administered Address: This address modifies the adapter’s MAC address. This address can be assigned to a network administrator’s device. 

50. Explain the distinction between the Collision and Broadcast Domains.

This question related to the Collision can be asked in CCNA Interview questions.

In the Broadcast Domain, all junctures can communicate with one another via broadcast at the Data Link Layer, and each device is prepared to receive its own data. It can connect to the same or different LAN segments.

Broadcast Domain broadcasts data packets to the receiver via a local network. Massive data is disseminated during broadcasting, therefore the pace of receiving data is slower and it takes longer to receive data for their address.

Data collision occurs more frequently in the Collision Domain due to the simultaneous transmission of more frames.

If more than two frames are sent at the same time, the data will collide in the middle and the information will be lost. As a result, the devices will refuse to accept the data, causing the communication between the sender and recipient to collide.

As a result, the sender must send the data twice, causing the data to take longer to arrive at the receiver’s end.

51. What is HDLC, and how does it work?

This question is very important in CCNA Interview questions.

The HDLC protocol stands for High-Level Data-Link Control. It is a widely used ISO-standard bit-oriented Data Link layer protocol for data transmission. It is suitable for both point-to-point and point-to-multipoint transmission. HDLC divides data into frames, allowing devices to control the flow of data. The frame is sent through the network to the destination, which checks that it arrived safely.

The following are some of the advantages of HDLC:

  • Both half-duplex and full-duplex communication is supported.
  • Provides complete data transparency.
  • For synchronous data communication, it provides flexibility, dependability, and efficiency of operation.
  • Both synchronous and asynchronous communication is supported.

52. What is the definition of a distance-vector with an example?

Distance Vector Protocols deliver periodic updates to neighboring routers every 30 seconds or at any other time interval.

If there is an immediate connectivity failure, they will notify you to update after 30 seconds. The RIP routing information protocol, for example, is a distance-vector protocol. The term “distance” refers to the distance between two routers, whereas “vector” refers to the direction in which the link between them is connected.

53. What is a Frame Relay, and which layer does it belong to?

This is another question that can be asked in CCNA Interview questions.

Frame relay is a switched Data Link Layer encapsulation that serves numerous virtual circuits and protocols between coupled mechanisms and is an industry-standard. A packet-switched technology is a frame relay.

These were some of the top CCNA interview questions and answers that could help you out in an interview. Always remember to look up the company that you will be interviewing for to understand their operations. 

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