Book Image

Securing Network Infrastructure

By : Sairam Jetty, Sagar Rahalkar
Book Image

Securing Network Infrastructure

By: Sairam Jetty, Sagar Rahalkar

Overview of this book

Digitization drives technology today, which is why it’s so important for organizations to design security mechanisms for their network infrastructures. Analyzing vulnerabilities is one of the best ways to secure your network infrastructure. This Learning Path begins by introducing you to the various concepts of network security assessment, workflows, and architectures. You will learn to employ open source tools to perform both active and passive network scanning and use these results to analyze and design a threat model for network security. With a firm understanding of the basics, you will then explore how to use Nessus and Nmap to scan your network for vulnerabilities and open ports and gain back door entry into a network. As you progress through the chapters, you will gain insights into how to carry out various key scanning tasks, including firewall detection, OS detection, and access management to detect vulnerabilities in your network. By the end of this Learning Path, you will be familiar with the tools you need for network scanning and techniques for vulnerability scanning and network protection. This Learning Path includes content from the following Packt books: •Network Scanning Cookbook by Sairam Jetty •Network Vulnerability Assessment by Sagar Rahalkar
Table of Contents (28 chapters)
Title Page
Copyright and Credits
About Packt
Contributors
Preface
Index

Calculating ROIs


Designing and implementing security controls is often seen as a cost overhead. Justifying the cost and effort of implementing certain security controls to management can often be challenging. This is when one can think of estimating the return-on-investment for a vulnerability management program. This can be quite subjective and based on both qualitative and quantitative analysis.

While the return-on-investment calculation can get complicated depending on the complexity of the environment, let's get started with a simple formula and example:

Return-on-investment (ROI) = (Gain from Investment – Cost of Investment)    * 100/ Cost of Investment

For a simplified understanding, let's consider there are 10 systems within an organization that need to be under the purview of the vulnerability management program. All these 10 systems contain sensitive business data and if they are attacked, the organization could suffer a loss of $75,000 along with reputation loss. Now the organization...