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)

Types of encryption

Here, we will discuss the main differences between symmetric and asymmetric encryption algorithms.

Symmetric encryption

Let's observe the following diagram. There are two devices wanting to exchange a message over an unsecure network such as the internet. Both Bob and Alice are worried that someone in between their machines may be monitoring their traffic and that their privacy is at risk:

With symmetric encryption, Alice would use a secret key to encrypt or scramble her message for Bob. When Bob receives the Ciphertext (encrypted message), he would use the same secret key as Alice to decrypt the Ciphertext to obtain the actual message.

To describe symmetric encryption simply, this method uses the...