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Question 453 of 1,000

Trust and security with Google Cloud →mediumMultiple ChoiceObjective-mapped

Zero Trust Security Model

This GCDL practice question tests your understanding of trust and security with google cloud. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A security architect wants to implement a 'never trust, always verify' security approach where no user or service is assumed to be trustworthy based on network location alone. Every access request must be authenticated and authorized regardless of whether it comes from inside or outside the corporate network. Which security model describes this approach?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Clue: "never"
Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.

A
Perimeter security model
Why wrong: Perimeter security (castle and moat) trusts everything inside the network perimeter. Zero Trust is the opposite — it distrusts all requests regardless of network location.
B
Zero Trust security model
Zero Trust requires authentication and authorization for every request, regardless of network origin. 'Never trust, always verify' is the defining principle of Zero Trust.
C
Defense in depth model
Why wrong: Defense in depth uses multiple security layers. While complementary to Zero Trust, it doesn't specifically describe the 'verify every request regardless of network location' principle.
D
Principle of least privilege
Why wrong: Least privilege grants only the minimum permissions needed — an important security principle but not the same as Zero Trust's 'always verify regardless of network location' approach.

Full breakdown with real-world context →

Quick Answer

The correct answer is the Zero Trust security model. This model enforces the 'never trust, always verify' principle by requiring authentication and authorization for every access request, regardless of whether it originates inside or outside the corporate network, rejecting any assumption of trust based solely on network location. On the Google Cloud Digital Leader exam, this concept is directly tied to Google Cloud’s BeyondCorp implementation, which uses tools like Identity-Aware Proxy (IAP) and context-aware access to verify user identity, device posture, and other attributes instead of relying on IP addresses or perimeter defenses. A common trap is confusing Zero Trust with traditional VPN-based or firewall-centric models, which still assume internal traffic is safe. To remember: think of BeyondCorp as “no perimeter trust”—every request, even from inside, must prove its identity and context before gaining access.

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

✓

Zero Trust security model

The Zero Trust security model (Option B) is correct because it explicitly enforces the 'never trust, always verify' principle, requiring authentication and authorization for every access request regardless of network location. In Google Cloud, this aligns with BeyondCorp, which uses identity-aware proxy (IAP) and context-aware access to verify each request based on user identity, device posture, and other attributes, rather than trusting based on IP address or network perimeter.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Perimeter security model
Why it's wrong here
Perimeter security (castle and moat) trusts everything inside the network perimeter. Zero Trust is the opposite — it distrusts all requests regardless of network location.
✓
Zero Trust security model
Why this is correct
Zero Trust requires authentication and authorization for every request, regardless of network origin. 'Never trust, always verify' is the defining principle of Zero Trust.
Clue confirmation
The clue words "always", "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Defense in depth model
Why it's wrong here
Defense in depth uses multiple security layers. While complementary to Zero Trust, it doesn't specifically describe the 'verify every request regardless of network location' principle.
✗
Principle of least privilege
Why it's wrong here
Least privilege grants only the minimum permissions needed — an important security principle but not the same as Zero Trust's 'always verify regardless of network location' approach.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse 'defense in depth' (Option C) with Zero Trust because both involve multiple security layers, but defense in depth does not inherently require every request to be verified regardless of network location, which is the defining characteristic of Zero Trust.

Detailed technical explanation

How to think about this question

Under the hood, Zero Trust in Google Cloud is implemented via BeyondCorp, which uses Identity-Aware Proxy (IAP) to enforce access decisions at the application layer, leveraging OAuth 2.0 and OpenID Connect for authentication and context-aware access policies based on device state (e.g., via Endpoint Verification). A subtle behavior is that even internal traffic between VMs in the same VPC must pass through IAP or use service accounts with fine-grained IAM roles, eliminating implicit trust from network segmentation. In a real-world scenario, a compromised internal VM cannot access a Cloud Storage bucket unless the request is explicitly authenticated and authorized, preventing lateral movement.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this GCDL question test?

Trust and security with Google Cloud — This question tests Trust and security with Google Cloud — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Zero Trust security model — The Zero Trust security model (Option B) is correct because it explicitly enforces the 'never trust, always verify' principle, requiring authentication and authorization for every access request regardless of network location. In Google Cloud, this aligns with BeyondCorp, which uses identity-aware proxy (IAP) and context-aware access to verify each request based on user identity, device posture, and other attributes, rather than trusting based on IP address or network perimeter.

What should I do if I get this GCDL question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "always", "never". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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