Book Image

CASP+ CompTIA Advanced Security Practitioner Study Guide: Exam CAS-003 - Third Edition

By : Jeff T. Parker, Michael Gregg
Book Image

CASP+ CompTIA Advanced Security Practitioner Study Guide: Exam CAS-003 - Third Edition

By: Jeff T. Parker, Michael Gregg

Overview of this book

The next few years will bring a 45-fold increase in digital data and at least one-third of that data will pass through the cloud. The level of risk to data everywhere is growing in parallel and organizations are in need of qualified data security professionals to safeguard their information. The CASP+ certification validates this in-demand skillset and this book is your ideal resource for passing the exam. CASP+ meets the ISO 17024 standard and is approved by the U.S. Department of Defense to fulfill Directive 8570.01-M requirements. It is also compliant with government regulations under the Federal Information Security Management Act (FISMA). As such, this career-building credential makes you in demand in the marketplace and shows that you are qualified to address enterprise-level security concerns. The CASP+ CompTIA Advanced Security Practitioner Study Guide: Exam CAS-003, Third Edition, is the preparation resource you need to take the next big step for your career and pass with flying colors. This book provides detailed explanations of technical and business concepts that give you the background you need to apply, identify, and implement appropriate security solutions. You’ll solidify your understanding of each objective with end-of-chapter reviews. The book contains hands-on lab exercises and hundreds of practice questions to help you test your knowledge in advance of the exam. By the end of the book, you’ll have the knowledge and the confidence to ace the CASP+ certification exam.
Table of Contents (22 chapters)
Free Chapter
1
Cover
2
Acknowledgments
3
About the Authors
4
Table of Exercises
6
Assessment Test
7
Answers to Assessment Test
18
Index
19
Advert
20
End User License Agreement

Firewalls and Network Access Control

Firewalls can be hardware, software, or a combination of both. They are usually located at the demarcation line between trusted and untrusted network elements. Firewalls play a critical role in the separation of important assets. An example of the placement of a typical firewall can be seen in Figure 4.1.

Diagram shows network of internet (untrusted network connection), firewall, workstation, and server (trusted network connections internal network).

FIGURE 4.1 Firewall placement and design

Firewall rules determine what type of traffic is inspected, what is allowed to pass, and what is blocked. The most basic way to configure firewall rules is by means of an access control list (ACL). An ACL is used for packet filtering and for selecting the types of traffic to be analyzed, forwarded, or influenced in some way by the firewall or device. ACLs are a basic example of data flow enforcement. Simple firewalls, and more specifically ACL configuration, may block traffic based on the source and destination address. However, more advanced configurations may deny traffic based on interface, port, protocol...