CCNA Interview Questions and Answers 2011

CCNA Interview Questions and Answers 2011


Welcome to our blog post on CCNA interview questions and answers from the year 2011! This post aims to provide you with a comprehensive list of questions and their detailed answers, which will help you prepare for your upcoming CCNA interviews. CCNA (Cisco Certified Network Associate) is an entry-level certification for network administrators, and the knowledge and skills required for CCNA have evolved over time. In this article, we will focus on the questions that were popular in 2011, allowing you to better understand the technological landscape of that year.

1. What are the different types of network topologies?

Answer: In 2011, the prevalent network topologies included:

  • Bus Topology
  • Ring Topology
  • Star Topology
  • Mesh Topology
  • Hybrid Topology

Each topology has its advantages and disadvantages, and understanding them is crucial for designing and troubleshooting networks effectively.

2. What are the key differences between a switch and a hub?

Answer: Hubs and switches are both used to connect network devices, but they operate in different ways.

A hub operates at the physical layer of the OSI model, simply broadcasting incoming data to all connected devices. In contrast, a switch operates at the data link layer, intelligently forwarding data only to the destination device. Switches offer better performance, security, and scalability compared to hubs.

3. Explain the process of subnetting.

Answer: Subnetting involves dividing a network into smaller subnetworks or subnets. This process helps in efficient address space utilization and improved network performance.

In 2011, the most common subnetting technique was Classful Subnetting, where IP addresses were divided into classes (Class A, B, and C).

Subnetting involves the following steps:

  1. Identify the network requirements and determine the number of required subnets.
  2. Select a suitable subnet mask based on the number of subnets.
  3. Allocate IP addresses to each subnet by defining the network and host portions.
  4. Document the subnetting plan for future reference.

4. What is VLAN and how does it work?

Answer: VLAN (Virtual Local Area Network) is a logical grouping of network devices, even if they are not connected physically. VLANs help in segmenting a large network into smaller broadcast domains, improving performance and security.

VLANs work by assigning specific ports on switches to a particular VLAN, creating isolated broadcast domains. Traffic within a VLAN is not directly forwarded to devices in other VLANs, reducing unnecessary network traffic and improving overall efficiency.

5. What is the purpose of Access Control Lists (ACLs)?

Answer: ACLs are used to control network traffic based on a set of defined rules. These rules determine whether to permit or deny data flow between networks or specific devices.

In 2011, standard IP ACLs (1-99) and extended IP ACLs (100-199) were commonly used. Standard ACLs filter traffic based on source IP addresses, while extended ACLs can filter based on source/destination IP addresses, ports, protocols, and more.

ACLs are essential for network security, traffic flow control, and preventing unauthorized access.


Throughout this blog post, we have explored some of the prevalent CCNA interview questions and their answers from the year 2011. A solid understanding of these concepts will help you excel in your CCNA interviews and stay abreast of the evolving networking technologies.

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