Defense in Depth

5 minutes 5 Questions

Defense in Depth is a security strategy that involves implementing multiple layers of protection throughout an information technology (IT) infrastructure, covering hardware, software, and human aspects. This principle implies that if one security control fails, other layers will still provide protection. By diversifying security measures and ensuring redundancy, organizations can minimize the likelihood of a single point of failure, safeguard business-critical data, and maintain system availability. Defense in Depth typically consists of preventive, detective, and corrective controls that work together to create a resilient security posture.

Guide: Defense in Depth

Definition:
Defense in Depth (DiD) is a strategic approach to cyber security in which multiple methods of defense are layered to protect valuable data and information. This principle derives from a military strategy that aims to delay the advance of an attacker, rather than preventing a single attack.

Importance:
DiD is important because it provides a comprehensive and robust security stance. By setting multiple layers of defense, the system ensures that if one defense line fails, others are in place to mitigate the risk. This layered approach also aids in detecting, delaying, and responding to attacks.

How it Works:
Defense in Depth strategy works by implementing several security mechanisms on each layer of the information system. These layers traditionally include physical, network, computer, application, and device layers. Security measures at each layer can include firewalls, intrusion detection systems, user authentication methods, encryption, antivirus software, etc.

Exam Tips - Answering Questions on Defense in Depth:
1. Understand the concept: Ensure to have a strong understanding of the DiD strategy, its importance, and its working.
2. Practical Examples: Use practical examples in your explanation to showcase a good understanding of the concept.
3. Explain layers: In an exam, if asked about DiD, ensure to discuss the different layers involved in this strategy.

Test mode:

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Question 1

You are a security analyst for a financial set-up and working on Defense in Depth implementation. The current gap is the lack of network segmentation. Which of the following would be the BEST solution?

Installing web application firewalls Implementing VLANs Installing antivirus software on each workstation Enabling WPA3 on wireless networks

Correct Answer: Implementing VLANs

The best way to implement network segmentation is through Virtual Local Area Networks (VLANs), which separate network traffic into different channels based on security levels or departments. The other answers focus on different aspects of security, but do not directly address network segmentation.

Question 2

A major concern raised during the security audit of your small organization is the absence of physical security measures. Which of the following measures would be the first priority to enhance physical security?

Hiring uniformed security guards Installing metal detectors at entrance points Implementing employee ID badge systems for public areas Using secure access control to the server room

Correct Answer: Using secure access control to the server room

Securing access to the server room should be the priority since it houses critical IT infrastructure. While other measures will also improve physical security, they do not address the significance of securing key assets like the server room.

Question 3

Your company is adopting a layered security approach to enhance protection. Which of the following best represents the 'principle of least privilege' enforcement?

Installing firewalls Implementing two-factor authentication Using strong passwords Restricting users' access to only required resources

Correct Answer: Restricting users' access to only required resources

The principle of least privilege means that users should only have access to the resources that are necessary for their job. This limits the potential damage in case of a security breach. The other options are essential security practices but do not directly enforce the principle of least privilege.

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