Frequently Asking Interview Question and Answers

You are here because you know that one of the most preferred certifications in networking in CCNA. These question and answers can help you in coming out in flying colors in the networking interview in flying colors

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CCNA Interview Questions

CCNA Interview Question and Answers

  1. What are Routers?
  2. What is Half duplex and Full duplex?
  3. What is the difference between LAN, MAN, and WAN?
  4. Define IP Address?
  5. What is the difference between Unicast, Multicast, Broadcast, and Anycast ?
  6. Can IP address be assigned to Layer 2?
  7. What is PING used for?
  8. What are the different class and ranges of IP address?
  9. What is Private IP and Public IP?
  10. What are the different types of passwords that you can use in Cisco routers ?
  11. How many types of memories are used in Cisco Router?
  12. What are the different types of cables that are used in routing?
  13. What is the IEEE standard for wireless networking?
  14. What is OSPF? Describe it.
  15. What does Round Trip Time mean?
  16. Why do you use ‘Service Password Encryption’?
  17. Explain DHCP scope.
  18. What is Routing?
  19. What is 100BaseFX?
  20. Utilizing RIP, what is the limit when it comes to the number of hops?
  21. What are the different IPX access lists?
  22. Explain the basic difference between TCP/IP and OSI model.
  23. What is the size of IP address?
  24. Mention the ranges for the private IPS?
  25. Explain the types of dynamic routing.
  26. What is the difference between static and dynamic IP addresses?
  27. What does router mean?
  28. What exactly is a router?
  29. What are the advantages of dynamic routing?
  30. What do we mean by IP address?
  31. What is an IP address for imbeciles?
  32. What is the IP address in single words?
  33. Why would I use DHCP?
  34. What is DHCP in WIFI?
  35. What is TCP IP Wikipedia?
  36. What is IP TCP in simple words?
  37. What is LAN in simple words?
  38. What is it? an example of a LAN?
  39. What is a ping message?
  40. What does the name ping mean?
  41. What is OSPF and how does it work?
  42. Why we use OSPF?
  43. What is the main function of DHCP?
  44. Why would I use DHCP?
  45. What is DHCP on the wireless network?
  46. What are DHCP settings?
  47. Why is DHCP important?
  48. Do the switches have DHCP?
  49. Do I need DHCP enabled on the router?
  50. What is the need for DHCP?

1. What are Routers?

Routing is the process to find the path on which the information or data can pass from the source to its destination. The device by which routing is done is called Routers.

2. What is Half duplex and Full duplex?

In half-duplex, transmission of information or communication is from one direction only.

Example: Walkie-talkie

In full duplex, transmission of information or communication is from both the directions.

Example: Talking on the telephone.

3. What is the difference between LAN, MAN, and WAN?

It is a local area network where computers and network devices are connected with each other, usually within the same area or building. Connections in LAN must be of high speed.

MAN
It is metropolitan area network where the networks are connected widely within several buildings in the same city.

WAN
It is a wide area network where the networks are limited to one enterprise or organization and can be accessed by the public. It connects several LANs. Connection in WAN is high speed and expensive too.

4. Define IP Address?

Internet Protocol (IP Address) is a 32-bits to 128-bits identifier for a device on TCP/IP protocol. IP address of a device must be uniquely defined for communication.

5. What is the difference between Unicast, Multicast, Broadcast, and Anycast?

Unicast: It is the exchange of messages between a single source and a single destination. In Unicast, while sending packets from a sender, it contains data address of the receiver so that it can go there directly.

Broadcast: It is the exchange of messages between one sender to possible multiple receivers. It works only on a local network. Broadcasting of data can’t be done on the public internet due to a massive amount of unrelated and unnecessary data.

Multicast: It is the exchange of messages between one sender and multiple receivers. In multicast, the network settings determine your receiving clients and sort of broadcasting.

Anycast: It is the exchange of messages between one host to another host. It uses TCP and UDP protocol. Copy of each data packet goes to every host that requests it.

6. Can IP address be assigned to Layer 2?

No, IP addresses cannot assign to Layer2.

7. What is PING used for?

PING is packet Internet groper. It is used to test the reachability of a host on an Internet protocol (IP) network. When any data is sent via the network through the IP addresses, then it will PING the receiver to receive the data from the sender.

8. What are the different class and ranges of IP address?

There are 5 different classes of IP address:

ClassRange
A1-126
B127-191
C192-223
D224-239
E240-254

9. What is Private IP and Public IP?

Private IP
It is used within the local LAN.

Public IP It is used across the Internet.

10. What are the different types of passwords that you can use in Cisco routers?

Different types of passwords that are used in Cisco routers are enabled, enable secret, auxiliary (AUX), console and virtual terminal (VTY).

11. How many types of memories are used in Cisco router?

Given below are the 3 different types of memory that are used:

Flash memory– Store system IOS. It is electronically erasable and a re-programmable memory chip.

  • RAM– Store configuration file which is being executed. It loses its information when a router is restarted or shut down.
  • NVRAM– Store startup configuration file and IOS reads this file when the router boots up.
  • ROM– Read Only Memory. It saves the information if the router is shut down or restarted. It maintains the instructions for POST diagnostics.
  • What are the different types of cables that are used in routing?

12. What are the different types of cables that are used in routing?

Three different types of cables that are used include

  • Straight cable – (switch-router)
  • Cross cable – (PC-PC, switch-switch)
  • Rollover cable – (Console port to computer)

13. What is the IEEE standard for wireless networking?

IEEE 802.11

14. What is OSPF? Describe it.

OSPF stands for Open Shortest Path First. It uses Dijkstra algorithm and is a link state routing protocol which is used to connect to a large number of networks without having any limitation on the number of hops.

15. What does Round Trip Time mean?

Round-trip time or round-trip delay is defined as the time taken by a signal to send the data plus the time it receives the acknowledgment from the receiver of that signal.

16. Why do you use Service Password Encryption’?

Service Password Encryption is used to encrypt plaintext password into type 7 password. Security is less and hence it can be easily decrypted.

17. Explain DHCP scope.

Dynamic Host Configuration Protocol (DHCP) is used to automatically assign IP host with its address to a client.

18. What is Routing?

Routing is the process of finding a path on which data can pass from source to destination. Routing is done by a device called routers, which are network layer devices.

19. What is 100BaseFX?

This is Ethernet that makes use of fiber optic cable as the main transmission medium. The 100 stands for 100Mbps, which is the data speed.

20. Utilizing RIP, what is the limit when it comes to the number of hops?

The maximum limit is 15 hop counts. Anything higher than 15 indicates that the network is considered unreachable.

21. What are the different IPX access lists?

There are two types of IPX access lists

  1. Standard
  2. Extended.

Standard Access List can only filter the source or destination IP address. An Extended Access List uses the source and destination IP addresses, port, socket, and protocol when filtering a network.

22. Explain the basic difference between TCP/IP and OSI model.

OSI and TCP/IP protocol are different by their layers. In OSI model, there are 7 layers whereas in TCP/IP there are 4 layers.

23. What is the size of IP address?

Size of IP address is 32 bit for IPv4 and 128 bit for IPv6.

24. Mention the ranges for the private IPS?

Ranges for private IPS are

  • Class A: 10.0.0.0 – 10.0.0.255
  • Class B: 172.16.0.0 – 172.31.0.0
  • Class C: 192.168.0.0 – 192.168.0.255

25. Types of Dynamic Routing.

RIP, IGRP, EIGRP, OSPF

26. What is the difference between static and dynamic IP addresses?

Static IP address won’t change over the time and is reserved statically whereas dynamic IP address changes each time when you connect to the Internet.

27. What does router mean?

A router is a network device that sends packets of data between computer networks. Routers perform Internet traffic management functions. … Normally, a packet is routed from one router to another router through the networks that constitute an internal network until it reaches its destination node.

28. What exactly is a router?

Wireless routers allow multiple computers and other devices, such as smartphones and tablets, to join the same network. … Therefore, most routers have a specific Ethernet port designed to connect to the Ethernet port of a cable or DSL modem. A modem is a device that provides access to the Internet (see below)

29. What are the advantages of dynamic routing?

The main advantages of dynamic routing over static routing are scalability and adaptability. A dynamically routed network can grow faster and larger and can adapt to changes in the network topology caused by this growth or the failure of one or more network components.

30. What do we mean by IP address?

An IP address, or simply an “IP”, is a unique address that identifies a device on the Internet or on a local network. Allows a system to be recognized by other systems connected through the Internet protocol. Today, two major types of IP address formats are used: IPv4 and IPv6.

31. What is an IP address for imbeciles?

An IP address is assigned to each computer on an Ethernet network. Like the address of your home, an IP address identifies the computers on the network. This helps traffic flow between computers because each has its own IP address. An IP address is formatted as a series of four values separated by dots: 192.168.0.1.

32.What is the IP address in single words?

Internet Protocol (IP) is the method or protocol by which data is sent from one computer to another on the Internet. Each computer (known as a host) on the Internet has at least one IP address that uniquely identifies it from all other computers on the Internet.

33. Why would I use DHCP?

Dynamic Host Configuration Protocol (DHCP) is a protocol used to provide fast, automatic and central administration for the distribution of IP addresses within a network. DHCP is also used to configure the subnet mask, default gateway, and DNS server information on the device.

34. What is DHCP in WIFI?

In simple terms, Dynamic Host Configuration Protocol (DHCP) determines whether an IP is static or dynamic and the amount of time an IP address is assigned. … Having this function enabled on a computer simply means that you are allowing a DHCP server to assign its IP.

35. What is TCP IP Wikipedia?

The transmission control protocol (TCP) is one of the main protocols of the Internet protocol suite. It originated in the implementation of the initial network in which it complemented the Internet Protocol (IP). Therefore, the complete packet is commonly called TCP / IP.

36. What is IP TCP in simple words?

Transmission Control Protocol (TCP) is one of the main protocols of the Internet Protocol Suite. TCP is part of the popular “TCP / IP” combination used by the Internet. The Internet Protocol, or IP, ensures that data on the Internet reaches the correct location.

37.What is LAN in simple words?

A local area network (LAN) is a computer network that covers a relatively small area. Most of the time, a LAN is limited to a single room, building or group of buildings, however, a LAN can be connected to other LANs at any distance through telephone lines and radio waves.

38. What is it? an example of a LAN?

The area network can serve only as two or three users (for example, in a small business network) or several hundred users in a larger office. The LAN network comprises cables, switches, routers, and other components that allow users to connect to internal servers, Web sites and other LANs on long-distance networks.

39. What is a ping message?

Ping is a computer network management software utility used to test the accessibility of a host over an Internet Protocol (IP) network. It measures the round trip time for messages sent from the source host to a destination computer that refers to the source.

40. What does the name ping mean?

The Chinese name Ping is a popular name for girls and means “peaceful level”. It can be used alone or with a combination of other names.

41. What is OSPF and how does it work?

It means dividing the routers into a single stand-alone system running OSPF. into areas where each area consists of a group of connected routers. … Having many routers exchange the link state database could flood the network and reduce its efficiency – this was the need that led to the creation of concept Areas.

42. Why we use OSPF ?

The OSPF protocol is a link state routing protocol, which means that routers exchange topology information with their nearest neighbors. The topology information is flooded throughout the AS, so each router within the AS has a complete view of the AS topology.

43.What is the main function of DHCP?

DHCP stands for Dynamic Host Configuration Protocol. The embedded DHCP server automatically assigns IP addresses to computers and other devices on each local area network (LAN).

44. Why would I use DHCP?

Dynamic Host Configuration Protocol (DHCP) is a protocol used to provide fast, automatic, and central administration for the distribution of IP addresses within a network. DHCP is also used to configure the subnet mask, default gateway, and DNS server information on the device.

45. What is DHCP on the wireless network?

Dynamic Host Configuration Protocol (DHCP) is a network management protocol used to dynamically assign an IP address to any device or node on a network so that they can communicate. through IP. … DHCP can be deployed in small local networks as well as in large enterprise networks.

46. What are DHCP settings?

The Dynamic Host Configuration Protocol (DHCP) server settings are commonly found in the broadband router firmware. The DHCP section is where you can configure the router’s internal DHCP server to assign IP addresses to computers and other devices on your local area network (LAN).

47. Why is DHCP important?

To resolve these “problems,” you can use the DHCP protocol on your network. DHCP allows you to manage network IP address scopes and other TCP / IP settings, such as DNS, default gateway, and so on. from the central place, this central place called DHCP server.

48. Do the switches have DHCP?

The IP assigned to your switch may not be related to the DHCP range that the switch could offer. However, in your configuration, the router is more likely to act as a DHCP server and the switch performs only the typical Layer 2 tasks and sends its packets. You have three separate problems here.

49. Do I need DHCP enabled on the router

DHCP through the router. On the General Settings tab or LAN Settings on most routers, there is a DHCP configuration option. … If this option is turned off, an IP address must be assigned statically to each computer or have a DHCP server on the network. That goes for cable and wireless.

50. What is the need for DHCP?

With DHCP, it is not necessary to manually assign IP addresses to new devices. Therefore, no user configuration is required to connect to a DCHP-based network. Due to its ease of use and broad support, DHCP is the standard protocol used by most routers and network equipment.

The above quesitons will provide you with a fair idea of how to get ready for a CCNA interview. You are required to have all the concepts relating to CCNA in your fingertips to crack the interview with ease. These CCNA questions will boost your confidence level in attending the interviews.