Covid-19 Update!!    We have enabled all courses through virtual classroom facility using Skype or Zoom.    Don't stop learning.    Enjoy Learning from Home.

30% Discount Python        30% Discount Webdesign        30% Discount SEO        30% Discount Angular8        Free SQL Class        Free Agile Workshop       Free HTML Sessions        Free Python Basics

Important CCNA Interview Questions and Answers

CCNA Interview Questions

1. What is Routing?

The procedure of finding a path on which data can pass from source to target. Routing is done by a device called routers, which is a network layer devices.

2. What is the purpose of the Data Link?

The purpose of Data Link layer is to verify messages are sent to the right device. Another function of this layer is framing

3. What is the key advantage of using switches?

The key advantage of using the switches is, when a switch receives a signal, it forms a frame out of the bits that was extracted from that signal. With this action, it gains access and reads the destination address, after which it forwards that frame to the appropriate port. This is a well-organized means of data transmission, instead of broadcasting it on all ports.

4. When does network congestion occur?

When too many users are trying to occupy the same bandwidth means network congestion can occurs. Mainly, it is true in big networks that do not resort to network segmentation.

5. What is a Window in networking terms?

A Window refers to the number of segments that is permitted to be sent from source to destination before an acknowledgement is sent back.

6. Explain the difference between half-duplex and full-duplex?

The different between half-duplex and full- duplex is, in Full duplex the communication can occur in both directions at the same time, but in half duplex the communication can occur in one direction at time.

7. Which LAN switching method is used in CISCO Catalyst 5000?

This model uses the Store-and-forward switching method. It saves the entire frame to its buffers and performs a crc check before deciding whether to forward that dataframe or not.

8. What are the different memories used in a CISCO router?

  • NVRAM saves the startup configuration file
  • DRAM saves the configuration file that is being executed
  • Flash Memory – stores the Cisco IOS.

    9. What is BootP?

    A protocol that is used to boot diskless workstations that are linked to the network. Diskless workstations also use BootP in order to control its own IP address as well as the IP address of the server PC.

    10. What is the function of the Application Layer in networking?

    The Application Layer supports the communication components of an application and provides network services to approach processes that span beyond the OSI reference model identification. It also synchronizes applications on the server and client.

    11. Explain what is EIGRP?

    Enhanced Interior Gateway Routing Protocol is designed by Cisco Systems. It is used on a router to share routes with other routers within the same autonomous system. Unlike other routers RIP, EIGRP only sends related updates, reducing the workload on the router and the amount of data that needs to be relocated.

    12. Mention the conversion steps of data encapsulation?

    Conversion steps of data encapsulation includes
    Layer one (Application), two (presentation) and Three (session) : Alphanumeric input from the user is transformed into Data
  • Layer Four (Transport): Data is transformed into small segments
  • Layer Five (Network): Data transformed into packets or datagrams and Network header is added
  • Layer Six (Data Link): Datagrams or packets are built into frames
  • Layer Seven (Physical): Frames are transformed into bits

    13. How do you depict an IP address?

    It can be done in three possible ways:
  • using Dotted-decimal. For example: 192.168.0.1
  • using Binary. For example: 10000010.00111011.01110010.01110011
  • using Hexadecimal. For example: 82 1E 10 A1

    14. What is HDLC?

    HDLC stands for High Level Data Link Control protocol, it is a propriety protocol of CISCO and default encapsulation operated within CISCO routers.

    15. What is Bandwidth?

    Bandwidth means the transmission capacity of a medium. It is a measure of how much volume a transmission channel can handle and is measured in Kbps.

    16. What are packets?

    Packets are the results of data encapsulation, which is also called as datagrams. These are the data that has been enclosed under the various protocols of the OSI layers.

    17. Give some benefits of LAN switching.

  • Allows full duplex data transmission and reception
  • media rate adaption
  • easy and efficient migration

    18. What is route poisoning?

    A technique of prohibiting a network from transmitting packets through a route that has become invalid is called Route poisoning.

    19. What are the different types of passwords used in securing a CISCO router?

    These are the five enable password for CISCO router, enable, virtual terminal, console, and auxiliary.

    20. What route entry will be assigned to dead or invalid route in case of RIP?

    Table entry 16 hops will be assigned to dead or invalid route making it unreachable in case of RIP.