CCNA Interview Questions and Answers 2019

CCNA Interview Questions and Answers 2019

Welcome to our blog post covering the most relevant CCNA interview questions and answers for the year 2019.
Whether you’re preparing for an interview or expanding your knowledge in Cisco networking, these questions
and answers will help you acquire a solid understanding of CCNA concepts and increase your chances of success.
Let’s dive right in!

1. What is CCNA?

CCNA stands for Cisco Certified Network Associate. It is an entry-level certification offered by Cisco Systems,
which validates the skills and knowledge required to install, operate, and troubleshoot medium-sized routed and
switched networks.

2. Why is CCNA important?

CCNA certification is highly valued in the IT industry as it demonstrates your proficiency in network
fundamentals, routing and switching technologies, network automation, security, and more. It serves as a strong
foundation for various IT careers, including network engineering, network administration, and cybersecurity.

3. What are the prerequisites for CCNA certification?

There are no formal prerequisites for the CCNA certification. However, it is recommended to have a basic
understanding of networking concepts and some experience with Cisco devices before attempting the CCNA exam.

4. Describe the OSI model and its layers.

The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a
communication system into seven different layers. These layers are:

  • 1. Physical Layer
  • 2. Data Link Layer
  • 3. Network Layer
  • 4. Transport Layer
  • 5. Session Layer
  • 6. Presentation Layer
  • 7. Application Layer

5. How does a switch differ from a hub?

A switch operates at the data link layer (Layer 2) of the OSI model and uses MAC addresses to forward traffic
to the appropriate port, resulting in better performance and reduced network collisions. On the other hand, a
hub operates at the physical layer (Layer 1) and simply broadcasts incoming traffic to all connected devices
without any intelligence to manage the network.

6. What is subnetting?

Subnetting is the process of dividing a network into smaller subnetworks called subnets. It allows efficient
utilization of IP addresses and helps in controlling network traffic. Subnetting involves borrowing bits from
the host portion of an IP address to create new subnets.

7. Explain the difference between a router and a switch.

A router operates at the network layer (Layer 3) of the OSI model and is responsible for forwarding data packets
between different networks. It uses routing tables and logical addressing (IP addresses) to determine the best
path for data transmission. In contrast, a switch operates at the data link layer (Layer 2) and is used to
create a network by connecting multiple devices together.

8. What is VLAN and why is it used?

VLAN stands for Virtual Local Area Network. It is a logical grouping of devices in a network, regardless of
their physical locations. VLANs are used to enhance network security, improve performance, and simplify network
management by segmenting a large network into smaller, more manageable broadcast domains.

9. What are the different types of routing protocols?

There are two main types of routing protocols:

  • 1. Distance Vector Routing Protocols: Examples include Routing Information Protocol (RIP) and Interior
    Gateway Routing Protocol (IGRP). Distance vector protocols use a distance metric (such as hop count) to
    determine the best path to the destination.
  • 2. Link State Routing Protocols: Examples include Open Shortest Path First (OSPF) and Intermediate System
    to Intermediate System (IS-IS). Link state protocols use a complex metric, considering factors like
    bandwidth and delay, to determine the best path.

10. How can you secure a Cisco router?

To secure a Cisco router, you can take the following measures:

  • Implement strong and unique passwords for administrative access.
  • Enable SSH (Secure Shell) instead of Telnet for remote access.
  • Enable encryption using protocols like IPsec (Internet Protocol Security) or SSL/TLS (Secure Sockets
    Layer/Transport Layer Security).
  • Disable unnecessary services and ports.
  • Regularly update the router’s firmware to patch any security vulnerabilities.

These are just some of the many frequently asked CCNA interview questions and their answers. It is important to
continue exploring and studying different topics within CCNA to have a comprehensive understanding. We hope
this blog post has been helpful in your preparation and wish you the best of luck in your future CCNA
endeavors!

Thank you for reading!

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