Question 1easymultiple choice
Full question →easymultiple choiceObjective-mapped
A company deploys firewalls, intrusion detection systems, and endpoint antivirus software at multiple layers of its network. This strategy is intended to ensure that if one security control fails, others still provide protection. Which security concept does this approach represent?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Defense in depth
Defense in depth is the correct concept. It employs overlapping security controls so that if one layer is breached, subsequent layers continue to protect the system.
B
Distractor review
Least privilege
Least privilege is about granting users the minimum permissions needed to perform their tasks, not about layered controls.
C
Distractor review
Separation of duties
Separation of duties prevents a single individual from having excessive control by splitting critical actions among multiple people, not by layering defenses.
D
Distractor review
Zero trust
Zero trust is a security model that requires continuous verification of every access request, treating all users as potential threats even if inside the network. It is not the same as deploying multiple security layers.
Common exam trap
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Technical deep dive
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Related practice questions
Related SC-900 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A company must retain all customer contracts for 10 years to comply with industry regulations. After 10 years, the contracts must be permanently deleted. Which Microsoft Purview solution should be used to automate this process?
Question 2
A company uses a cloud-based SaaS (Software as a Service) application for customer relationship management. According to the shared responsibility model, which security responsibility is primarily handled by the customer?
Question 3
A company runs a mix of on-premises servers and Azure virtual machines. They deploy Microsoft Defender for Endpoint on all servers. The security team wants to create custom queries to hunt for a specific attack pattern that involves a sequence of events across multiple machines, such as a PowerShell script being downloaded and then executed on several servers. They need to write their own detection rules based on advanced hunting data. Which Microsoft 365 Defender capability should they use?
Question 4
A company runs a consumer-facing e-commerce website and wants to allow customers to sign in using their existing social media accounts such as Google, Facebook, or LinkedIn. Which Microsoft Entra ID solution should they implement?
Question 5
A company has a hybrid identity environment with Active Directory synchronizing to Microsoft Entra ID. They want users to be able to reset their own on-premises passwords via the cloud SSPR portal. What is the minimum license required for this capability?
Question 6
A company uses a cloud-based Customer Relationship Management (CRM) system that is delivered as Software-as-a-Service (SaaS). According to the shared responsibility model, which security responsibility is primarily handled by the customer?
FAQ
Questions learners often ask
What does this SC-900 question test?
Authentication checks who the user is.
What is the correct answer to this question?
The correct answer is: Defense in depth — The scenario describes a layered security approach known as 'defense in depth'. This strategy uses multiple independent controls so that no single point of failure can compromise the entire system. The other options represent different security concepts: least privilege limits access rights, separation of duties divides critical tasks among multiple people, and zero trust assumes no implicit trust and requires continuous verification.
What should I do if I get this SC-900 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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