Using Defense-In-Depth Strategy

Posted by in Security+ | 0 comments

It’s common to implement several controls using a defense-in-depth strategy. If you’re planning to take the SY0-501 version of the Security+ exam, you should have a good understanding of frameworks, best practices, and secure configuration guides. This includes implementing defense-in-depth/layered security to protect assets.

For example, can you answer this question?

Q. After a recent attack on your organization’s network, the CTO is insisting that the DMZ uses two firewalls and they are purchased from different companies. Which of the following BEST describes this practice?

A. Single-layer security

B. Vendor diversity

C. Control diversity

D. Redundancy

More, do you know why the correct answer is correct and the incorrect answers are incorrect? The answer and explanation are available at the end of this post.

Get Certified Get Ahead

Implementing Defense in Depth

Defense in depth (also known as layered security) refers to the security practice of implementing several layers of protection. You can’t simply take a single action, such as implementing a firewall or installing antivirus software, and consider yourself protected. You must implement security at several different layers. This way, if one layer fails, you still have additional layers to protect you.

If you drive your car to a local Walmart, put a five-dollar bill on the dash, and leave the keys in the car and the car running, there is a very good chance the car won’t be there when you come out of the store. On the other hand, if you ensure nothing of value is visible from the windows, the car is locked, it has an alarm system, and it has stickers on the windows advertising the alarm system, it’s less likely that someone will steal it. Not impossible, but less likely.

 

Using Defense-In-Depth Strategy

You’ve probably heard this as “there is no silver bullet.” If you want to kill a werewolf, you can load your gun with a single silver bullet and it will find its mark. The truth is that there is no such thing as a silver bullet. (Of course, there is no such thing as a werewolf either.)

Applied to computers, it’s important to implement security at every step, every phase, and every layer. Information technology (IT) professionals can never rest on their laurels with the thought they have done enough and no longer need to worry about security.

Full Security+ Course

SY0-401 Full Security+ Course

Helping you Pass the First Time

Online access includes all of the content from the

CompTIA Security+: Get Certified Get Ahead: SY0-401 Study Guide

Click here if you're looking for SYO-501 Full Security+ Course

  • Introduction
  • About the exam (including types of questions and strategies for performance-based questions)
  • 100 question pre-assessment exam
  • Mastering Security Basics (full content from Chapter 1 of the study guide including the exam topic review and 20 practice test questions)
  • Exploring Control Types and Methods (full content from Chapter 2 of the study guide including the exam topic review and 20 practice test questions)
  • Understanding Basic Network Security (full content from Chapter 3 of the study guide including the exam topic review and 20 practice test questions)
  • Securing Your Network (full content from Chapter 4 of the study guide including the exam topic review and 20 practice test questions)
  • Securing Hosts and Data (full content from Chapter 5 of the study guide including the exam topic review and 20 practice test questions)
  • Understanding Malware and Social Engineering (full content from Chapter 6 of the study guide including the exam topic review and 20 practice test questions)
  • Identifying Advanced Attacks (full content from Chapter 7 of the study guide including the exam topic review and 20 practice test questions)
  • Managing Risk (full content from Chapter 8 of the study guide including the exam topic review and 20 practice test questions)
  • Preparing for Business Continuity (full content from Chapter 9 of the study guide including the exam topic review and 20 practice test questions)
  • Understanding Cryptography (full content from Chapter 10 of the study guide including the exam topic review and 20 practice test questions)
  • Exploring Operational Security (full content from Chapter 11 of the study guide including the exam topic review and 20 practice test questions)
  • 100 question post-assessment exam
  • Security+ Acronyms

Get the SY0-401 Full Security+ Course Here

 Full Security+ Course


Test your readiness with these quality materials

Random 100-question tests

Random practice tests from the all of the practice test questions in the CompTIA Security+: Get Certified Get Ahead: SY0-401 Study Guide. All questions include explanations so you'll know why the correct answers are correct, and why the incorrect answers are incorrect.

34 Simulated Performance-based Questions

Eight sets of performance-based questions with multiple questions in each set. These questions help you understand and prepare for performance based questions.

22 Realistic Performance-based Questions

Two new sets of performance-based questions with a total of 22 questions. These new questions use a new testing engine that includes realistic drag and drop, matching, sorting, and fill in the blank questions.

Flashcard Set

  • 273 Security+ Flashcards to reinforce key testable concepts
  • 280 Security+ acronyms flashcards to help you master the required acronyms
  • 204 Security+ Remember This slides

Audio - SY0-401 Security+ Remember This Audio Files

Learn by Listening. Over one hour and 15 minutes of audio (MP3 downloads.)

Audio - SY0-401 Security+ Question and Answer Audio Files

Learn by Listening. Over three hours hour and 15 minutes of audio (MP3 downloads.)

Bonus #1

Audio from the end of chapter reviews from each of the chapters in the CompTIA Security+: Get Certified Get Ahead: SY0-401 Study Guide. Over one hour and 15 minutes of additional audio.

Bonus #2

Subnetting mini-tutorial that will help you answer two key question types:
  • Identify how many hosts a subnet supports
  • Identify valid IP addresses within a subnet

Bonus #3 

Access the study materials for a total of 60 days because sometimes life happens.

Get the SY0-401 Full Security+ Course Here

Click here if you're looking for SYO-501 Full Security+ Course

Control diversity is the use of different security control types, such as technical controls, administrative controls, and physical controls. For example, technical security controls such as firewalls, intrusion detection systems (IDSs), and proxy servers help protect a network. Physical security controls can provide extra protection for the server room or other areas where these devices are located. Administrative controls such as vulnerability assessments and penetration tests can help verify that these controls are working as expected.

Vendor diversity is the practice of implementing security controls from different vendors to increase security. Many DMZs use two firewalls and vendor diversity dictates the use of firewalls from different vendors. For example, one firewall could be a Cisco firewall and the other one could be a Check Point firewall. If a vulnerability is discovered in one of these firewalls, an attacker might be able to exploit it. However, it’s unlikely that both firewalls would develop a vulnerability at the same time.


CompTIA Security+ Study Guide

Are you looking for SYO-501 Study Guide?

The 501 Version of the Study Guide is Now Available. Click Here.

The 401 Version of the Study Guide

SY0-401 Study GuideThe CompTIA Security+: Get Certified Get Ahead: SY0-401 Study Guide is an update to the top-selling SY0-201 and SY0-301 study guides, which have helped thousands of readers pass the exam the first time they took it.

CompTIA Authorized Quality Content (CAQC)After a comprehensive review by ProCert Labs, the SY0-401 version has been certified as CompTIA Approved Quality Content (CAQC) and covers every aspect of the SY0-401 exam.

It includes the same elements readers raved about in the previous two versions.

Each of the eleven chapters presents topics in an easy to understand manner and includes real-world examples of security principles in action.

You’ll understand the important and relevant security topics for the Security+ exam, without being overloaded with unnecessary details. Additionally, each chapter includes a comprehensive review section to help you focus on what’s important.


Click for Free Preview


Over 400 realistic practice test questions with in-depth explanations will help you test your comprehension and readiness for the exam. The book includes:

  • A 100 question pre-test
  • A 100 question post-test
  • Practice test questions at the end of every chapter.

Each practice test question includes a detailed explanation to help you understand the content and the reasoning behind the question. You’ll be ready to take and pass the exam the first time you take it.

If you plan to pursue any of the advanced security certifications, this guide will also help you lay a solid foundation of security knowledge. Learn this material, and you’ll be a step ahead for other exams. This SY0-401 study guide is for any IT or security professional interested in advancing in their field, and a must read for anyone striving to master the basics of IT security.

Kindle edition also available.

Q. After a recent attack on your organization’s network, the CTO is insisting that the DMZ uses two firewalls and they are purchased from different companies. Which of the following BEST describes this practice?

A. Single-layer security

B. Vendor diversity

C. Control diversity

D. Redundancy

Answers is B. The chief technology officer (CTO) is recommending vendor diversity for the demilitarized zone (DMZ). Firewalls from different companies (vendors) provide vendor diversity. This also provides defense in depth or layered security, but not single-layer security.

Control diversity is the use of different controls such as technical, administrative, and physical.

Redundancy is the use of duplicate components for fault tolerance, but the two firewalls work together in the DMZ.

See Chapter 9 of the CompTIA Security+: Get Certified Get Ahead: SY0-501 Study Guide for more information on implementing controls to protect assets.

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.

CompTIA Security+: Get Certified Get Ahead: SY0-401 Study Guide

Subscribe To Our Newsletter

Join our mailing list and get a free excerpt of the CompTIA Security+: Get Certified Get Ahead: SY0-401 Study Guide.  This excerpt includes the introduction and Chapter 1. 

You have Successfully Subscribed!

Get Certified Get Ahead is a participant in the Amazon Services LLC Associates Program,
an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com.

Copyright © 2015 Get Certified Get Ahead. All Rights Reserved.