Layered Security

5 minutes 5 Questions

Layered security, also known as defense in depth, is a defensive strategy that involves the implementation of multiple security barriers to protect an entity. This approach encompasses different layers of protection, ensuring a single point of failure does not compromise the entire security system. In the context of physical security, these layers can include access control, intrusion detection, security lighting, perimeter security, and surveillance systems. Each layer is designed to tackle different types of threats and vulnerabilities, enhancing overall security effectiveness and making it harder for unauthorized individuals to access the facility or its assets.

Guide: Understanding and Answering Questions on Layered Security

What is Layered Security?
Layered Security, also known as defense in depth, is a strategy that involves the use of multiple lines of defense to protect IT systems. It is an element of physical security within the Certified Information Systems Security Professional (CISSP) scope.

Why is Layered Security important?
Layered Security is crucial as it provides a more robust protection strategy. If one layer is compromised, other layers still provide protection. This makes it difficult for an attacker to breach all the levels.

How does Layered Security work?
Layered Security works by providing different levels or 'layers' of security measures. This could include firewalls, intrusion detection systems, and access controls at different points within a network.

Exam Tips: Answering Questions on Layered Security
When answering exam questions on layered security, consider the following:
1. Understand the concept: You must have a comprehensive understanding of what Layered Security is and how it works.
2. Application of knowledge: Be capable of applying your understanding to different scenarios.
3. Memorize key points: Remember crucial elements like the role of different layers and their functioning in preventing security breaches.
4. Practice: Solve as many practice questions as you can to familiarize yourself with the topic and the type of questions that may be asked.

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Question 1

A company is implementing layered security to increase defense mechanisms. Which of the following is the MOST essential layer to consider first?

Network security Physical security Host-based security Application security

Correct Answer: Physical security

Physical security is the most essential layer to consider first, as it provides the foundation for all other security layers. It helps prevent unauthorized access to facilities, devices, and systems.

Question 2

A financial institution experienced a ransomware attack. Which layered security measure would BEST protect the institution’s data recovery capabilities?

Identity and access management system Strong encryption for data transmission Offline data backups Up-to-date antivirus definitions

Correct Answer: Offline data backups

Offline data backups are a critical layered security measure to ensure the financial institution can recover their data in case of a ransomware attack, since offline backups are not connected to the network, making them immune from the attack.

Question 3

An organization for Layered security wants to ensure the confidentiality of sensitive data transmitted over the network. Which of the following should they implement?

User awareness training alone Complex password policy exclusively Network segmentation only Data encryption

Correct Answer: Data encryption

Data encryption helps ensure the confidentiality of sensitive data transmitted over the network by converting the data into an unreadable format that can be deciphered only with the necessary decryption key. This prevents unauthorized access when data is intercepted.

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