CCNA Chapter 9 Questions and Answers Blog

CCNA Chapter 9 Questions and Answers

In this blog post, we will cover the essential questions and answers related to Chapter 9 of the Cisco Certified Network Associate (CCNA) certification. Chapter 9 focuses on network access control and provides foundational knowledge on securing network devices and implementing basic security protocols.

1. What are the key objectives of network access control?

Network access control aims to achieve the following objectives:

  • Authenticating and identifying users and devices attempting to connect to a network.
  • Authorizing users and devices based on their roles and permissions.
  • Implementing security measures to protect the network from unauthorized access.

2. What is 802.1X authentication and how does it work?

802.1X is an IEEE standard for port-based network access control. It provides a framework for authenticating users or devices before allowing them access to the network. The authentication process involves three main components:

  1. Supplicant: The user or device seeking network access.
  2. Authenticator: The network device (such as a switch or wireless access point) that controls access to the network.
  3. Authentication Server: The entity responsible for verifying the credentials provided by the supplicant.

When a supplicant attempts to connect to the network, the authenticator requests their credentials. The supplicant provides the credentials, which are forwarded securely to the authentication server for verification. If the credentials are valid, the authenticator allows the supplicant access to the network.

3. What is MAC address filtering and how does it enhance network security?

MAC address filtering is a security technique that permits or denies network traffic based on the MAC address of the device. Administrators can create an allowed list (whitelist) or blocked list (blacklist) of MAC addresses to control network access.

By implementing MAC address filtering, network administrators can enhance security by allowing only trusted devices to connect to the network. Unauthorized devices with unknown MAC addresses will be denied access, reducing the risk of unauthorized access and potential security breaches.

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