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 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?

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.

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.