CCNA Interview Questions and Answers

1. What is CCNA and CCNP in networking?
Cisco Certified Network Professional (CCNP) Certifications validate knowledge and skills required to install, configure, and troubleshoot converged local- and wide-areanetworks with 100 to 500 or more end-devices. One needs a valid CCNAcertification to obtain a CCNP certification.
2. What can you do with a CCNA?
Most Popular Job for Employees with a Cisco Certified Network Associate (CCNA) Certification Median Salary Charts
  • Network Engineer.
  • Network Administrator.
  • Sr. Network Engineer.
  • Information Technology (IT) Manager.
  • Systems Administrator.
  • Systems Engineer (Computer Networking / IT)
  • Information Technology (IT) Director.

 3. Which layer of the OSI model is responsible for reliable connections?

The Transport layer of the OSI model is responsible for reliable connections.
What is the difference between acknowledgments and handshaking?
Handshaking is used to negotiate the properties of a connection that is being established. Acknowledgments are used to tell the sender that data has been successfully received by the destination during the use of a connection.
4. What does a CCNA do for you?
The 200-125 CCNA is the composite exam associated with the Cisco Certified Network Associate Routing & Switching certification. This exam tests a candidate’s knowledge and skills required to install, operate, and troubleshoot a small to medium size enterprise branch network.
 5. How many VTP modes are there and what are they?
Three: Server, Client, and Transparent
6. How much does it cost to get a CCNA?
In the event that you want to obtain two separate exams for CCNA then you only need to pay $125 for every test. The cost of CCNP Composite is $300 as well. The best thing about CCNA is there’s no discrimination in terms of the pricing for the reason that the cost all over the world is just the same.
7. What is CCNA and CCNP in networking?
Cisco Certified Network Professional (CCNP) Certifications validate knowledge and skills required to install, configure, and troubleshoot converged local- and wide-areanetworks with 100 to 500 or more end-devices. One needs a valid CCNAcertification to obtain a CCNP certification.
8. What is the difference between TCP and UDP?
 The primary difference between TCP and UDP is that TCP is a connection oriented protocol and UDP is a connectionless protocol.
 9. What is HSRP?
 HSRP, or the Hot Standby Routing Protocol, is a Cisco proprietary protocol that brings routing functionality to end devices that would otherwise not be capable of taking advantage of redundant network connections. HSRP enables a pair of Cisco routers to work together to present the appearance of a single virtual default-gateway to end devices on a LAN segment.

10. What do You Understand by Routing?

Routing is the process of taking Packet from source to final destination. Router is the device which does routing, which is based on destination ip address. Router does this process on hop by hop basis.

11. What is the difference between IGRP and RIP?
While IGRP evaluates factors like reliability, bandwidth, hop count and MTU to deduce and provide the best routing network, RIP solely relies on the hop numbers in order to know which route can best use for a network.

12. Describe the difference between unicast, multicast, and broadcast traffic?
Unicast traffic flows from a single source to a single destination MAC address. Multicast traffic flows from a single source MAC address to many destinations and uses a functional MAC address. Broadcast traffic is from a single source to all devices on the Ethernet segment. This is specified by a destination MAC address of all ones.
 13. What are the four different Ethernet encapsulation types?
 From the Cisco IPX encapsulation command they are ARPA, NOVELL-ETHER, SAP and SNAP
Q-5 What are the three main tasks of a transparent bridge?
Answer: Learning, Forwarding, Filtering

14. Name three fundamental differences between LANs and WANs.

 Three fundamental differences between local-area and wide-area networks are:

LANs are limited to a small geographic area, such as a single building or small campus.

WANs cover a large geographic area, from citywide to worldwide.

LANs usually consist entirely of privately owned components. Some components of a

WAN, such as a packet switching network or point-to-point serial links, are usually leased

from a service provider.

A LAN provides high bandwidth at a relatively cheap price. The bandwidth across a WAN

is significantly more expensive.

15. What are the five layers of the TCP/IP protocol suite? What is the purpose of each layer?

The five layers of the TCP/IP protocol suite are the following:

Physical layer

Data link layer

Internet (or IP) layer

Host-to-host layer

Application layer

16. What is an address mask, and how does it work?

 An IP address mask identifies the network part of an IP address. Each one in the 32-bit mask marks the corresponding bit in the IP address as a network bit. A zero in the mask marks the

Corresponding bit in the IP address as a host bit. A Boolean AND is performed in all 32 bits of the address and the mask; in the result, all network bits of the mask will be repeated, and all host bits will be changed to zero.

 17.  What is a subnet? Why are subnets used in IP environments?

 A subnet is a sub grouping of a class A, B, or C IP address. Without subletting, the network part of a major class A, B, or C IP address can only identify a single data link. Subnetting uses some of the host bits of a major IP address as network bits, allowing the single major address to be “Subdivided” into multiple network addresses.

18. What is a redirect?

 A redirect is an IP router function. If a device has sent a packet to the router and the router must forward the packet to a next-hop router on the same data link, the router will send a redirect to the originating device. The redirect will inform the device that it can reach the next-hop router directly.

19.  What is the essential difference between TCP and UDP?

 TCP, or Transmission Control Protocol, provides a connection-oriented service over the

Connectionless internet layer. UDP, or User Datagram Service, provides a connectionless service.

20.  What mechanisms does TCP use to provide connection-oriented service?

 Correct sequencing is accomplished with sequence numbers. Reliability is accomplished by using checksums, acknowledgments, timers, and retransmissions. Flow control is accomplished by windowing.

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