Book Image

CCNA Security 210-260 Certification Guide

By : Glen D. Singh, Michael Vinod, Vijay Anandh
Book Image

CCNA Security 210-260 Certification Guide

By: Glen D. Singh, Michael Vinod, Vijay Anandh

Overview of this book

With CCNA Security certification, a network professional can demonstrate the skills required to develop security infrastructure, recognize threats and vulnerabilities to networks, and mitigate security threats. The CCNA Security 210-260 Certification Guide will help you grasp the fundamentals of network security and prepare you for the Cisco CCNA Security Certification exam. You’ll begin by getting a grip on the fundamentals of network security and exploring the different tools available. Then, you’ll see how to securely manage your network devices by implementing the AAA framework and configuring different management plane protocols. Next, you’ll learn about security on the data link layer by implementing various security toolkits. You’ll be introduced to various firewall technologies and will understand how to configure a zone-based firewall on a Cisco IOS device. You’ll configure a site-to-site VPN on a Cisco device and get familiar with different types of VPNs and configurations. Finally, you’ll delve into the concepts of IPS and endpoint security to secure your organization’s network infrastructure. By the end of this book, you’ll be ready to take the CCNA Security Exam (210-260).
Table of Contents (19 chapters)

Issues with authentication

Consider the following example in which Person A needs to send a message to Person B, but there might be some issues in checking the authenticity of the sender:

  • Authenticity: Person B should identify that the message is from Person A
  • Secrecy: Others (Person C) should not sniff the message

The solution to this problem is using the encryption algorithms.

Encryption

To ensure that data transfer is secure, the computer security systems adopt a mechanism known as encryption. Encryption is the process of converting a plaintext message into ciphertext, where only the person with the decryption key can read the ciphertext. Encryption enforces confidentiality on a computing system, and uses mathematical...