Question 746 of 1,013
What Is Defense in Depth?
A security architect is designing the network security posture for a new branch office. The plan includes a next-generation firewall at the perimeter, an intrusion prevention system on the internal network, mandatory multi-factor authentication for all remote access, and quarterly security awareness training for employees. The architect explains that these controls are independent of each other so that a failure in any single control does not leave the entire network unprotected. Which security concept is the architect primarily implementing?
Quick Answer
The answer is defense in depth, the security concept being implemented by layering multiple independent controls so that no single failure compromises the entire network. This approach is correct because it creates overlapping, redundant defenses—such as a next-generation firewall at the perimeter, an intrusion prevention system on the internal network, mandatory multi-factor authentication for remote access, and quarterly security awareness training—ensuring that if one layer is bypassed, another remains to detect or block the threat. On the Security+ SY0-701 exam, this question tests your understanding of layered security versus a single-point-of-failure model; a common trap is confusing defense in depth with a single control like a firewall or with defense in breadth (covering more assets). To remember it, think of the classic “castle analogy”: a moat, a drawbridge, guards, and locked doors all work independently, so one breach doesn’t lose the castle. Memory tip: “Layers, not lasers”—multiple independent layers, not one powerful but fragile control.
⚠ Common exam trap
Watch out — candidates often confuse 'defense in depth' with 'zero trust' because both involve multiple controls, but zero trust specifically requires continuous authentication and micro-segmentation, not just independent layers.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Defense in depth
The architect is implementing defense in depth by layering multiple independent security controls—a next-generation firewall (NGFW) at the perimeter, an intrusion prevention system (IPS) on the internal network, mandatory multi-factor authentication (MFA) for remote access, and quarterly security awareness training. The key phrase 'independent of each other so that a failure in any single control does not leave the entire network unprotected' directly describes the principle of layered defenses, where no single point of failure compromises overall security. This approach ensures that if an attacker bypasses the NGFW, the IPS or MFA may still prevent or detect the breach.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Least privilege
Why it's wrong here
Least privilege restricts users and systems to only the permissions necessary to perform their functions. It does not address the layering of multiple independent security controls.
When this WOULD be correct
A question where the scenario involves restricting user permissions to only what is necessary for their job role, such as 'A system administrator configures file permissions so that each employee can only access the folders required for their tasks.'
- ✓
Defense in depth
Why this is correct
Defense in depth uses multiple overlapping and independent security controls to protect an environment, ensuring that if one control fails, others continue to provide protection. The architect's design directly implements this principle.
- ✗
Zero trust
Why it's wrong here
Zero trust is a security model that assumes no implicit trust and requires continuous verification for every access attempt. While it may involve multiple controls, its primary focus is on verifying each request, not on layering independent controls as described.
When this WOULD be correct
A question describing a network architecture where all resources are segmented, every access request is authenticated and authorized regardless of source (e.g., internal or external), and no device or user is trusted by default. For example: 'An organization implements micro-segmentation, continuous authentication, and least-privilege access for all users, including those on the internal network.'
- ✗
Separation of duties
Why it's wrong here
Separation of duties divides critical tasks or privileges among multiple people to reduce the risk of fraud or error. The scenario does not involve splitting responsibilities among individuals.
When this WOULD be correct
A question describing a policy where one person cannot both approve and process payments, requiring two different employees for each step, would make separation of duties the correct answer.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SY0-701 exam frequently reuses these exact scenarios with slightly different constraints.
✓Defense in depthCorrect answer▾
Why this is correct
Defense in depth uses multiple overlapping and independent security controls to protect an environment, ensuring that if one control fails, others continue to provide protection. The architect's design directly implements this principle.
✗Least privilegeWrong answer — click to see why▾
Why this is wrong here
The question describes multiple overlapping security controls (firewall, IPS, MFA, training) that work together to protect the network even if one fails, which is the definition of defense in depth, not least privilege.
★ When this WOULD be the correct answer
A question where the scenario involves restricting user permissions to only what is necessary for their job role, such as 'A system administrator configures file permissions so that each employee can only access the folders required for their tasks.'
Why candidates choose this
Candidates may confuse least privilege with defense in depth because both are fundamental security principles, but least privilege focuses on access rights, not layered controls.
✗Zero trustWrong answer — click to see why▾
Why this is wrong here
Zero trust is a security model that assumes no implicit trust and requires continuous verification of every access request, but the question describes multiple independent layers of security (firewall, IPS, MFA, training) which is the definition of defense in depth, not zero trust.
★ When this WOULD be the correct answer
A question describing a network architecture where all resources are segmented, every access request is authenticated and authorized regardless of source (e.g., internal or external), and no device or user is trusted by default. For example: 'An organization implements micro-segmentation, continuous authentication, and least-privilege access for all users, including those on the internal network.'
Why candidates choose this
Candidates may confuse zero trust with defense in depth because both involve multiple security controls, but zero trust specifically focuses on eliminating implicit trust and verifying every access, whereas defense in depth layers independent controls to provide redundancy.
✗Separation of dutiesWrong answer — click to see why▾
Why this is wrong here
Separation of duties divides critical tasks among multiple people to prevent fraud or error, but the question describes multiple independent security controls, not task division among personnel.
★ When this WOULD be the correct answer
A question describing a policy where one person cannot both approve and process payments, requiring two different employees for each step, would make separation of duties the correct answer.
Why candidates choose this
Candidates may confuse 'independent controls' with 'separation of duties' because both involve redundancy, but separation of duties applies to human roles, not technical controls.
Analysis generated from the official SY0-701blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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Same concept, more angles
2 more ways this is tested on SY0-701
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A security architect is designing a defense strategy for a database containing sensitive customer records. The architect implements a network firewall to restrict inbound traffic to only the application server, enforces file-level encryption for the database files, requires multi-factor authentication for all administrative access, and deploys a database activity monitoring system to alert on unusual queries. Which security principle is the architect primarily applying?
medium- A.Least privilege
- ✓ B.Defense in depth
- C.Separation of duties
- D.Fail safe
Why B: The architect is applying defense in depth by layering multiple independent security controls: a network firewall, file-level encryption, multi-factor authentication, and database activity monitoring. This strategy ensures that if one control fails, others still provide protection, which is the core principle of defense in depth. Each layer addresses a different attack vector, making it significantly harder for an attacker to compromise the database.
Variation 2. A security architect is designing a defense-in-depth strategy for a corporate network. Which of the following are fundamental principles or concepts that should be incorporated into this strategy? (Choose four.)
medium- ✓ .Layered security controls to provide redundancy and prevent a single point of failure
- ✓ .Implementing a zero-trust model that assumes no implicit trust and requires continuous verification
- .Disabling all logging and monitoring to reduce system resource consumption
- ✓ .The principle of least privilege to limit user and system access to only what is necessary
- .Using a single, comprehensive security solution to minimize complexity and management overhead
- ✓ .Defining a separation of duties to prevent any single individual from having excessive control
Why : Defense-in-depth is a strategy that employs multiple layers of security controls to protect assets, ensuring redundancy and preventing a single point of failure. It also incorporates principles such as zero-trust (never trust, always verify), least privilege (granting only necessary access), and separation of duties (dividing responsibilities to reduce risk of abuse). Disabling logging and monitoring would reduce visibility and compromise security, while relying on a single comprehensive solution contradicts the layered approach.
Last reviewed: Jun 11, 2026
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