Question 1,061 of 1,152

Security Architecture →mediumMultiple ChoiceObjective-mapped

SY0-701 Security Architecture Practice Question

This SY0-701 practice question tests your understanding of security architecture. 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 at a retail company is deploying a new e-commerce platform that processes credit card payments. The architect needs to minimize the scope of the PCI DSS assessment. The platform consists of a web server, an application server, and a database server. The cardholder data (credit card numbers) will be processed and stored only on the database server. Which of the following network architecture designs would best reduce the PCI DSS scope?

Clue words in this question

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

Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

Question 1mediummultiple choice

Full question →

A
Place all servers in the same VLAN and apply a host-based firewall on the database server.
Why wrong: Placing all servers in the same VLAN creates a flat network where any server can potentially communicate with the database server. This would include the web and application servers in the PCI DSS scope because they are on the same network segment and can directly connect to cardholder data, increasing the assessment scope.
B
Place the database server in a separate, isolated network segment with a dedicated firewall that blocks all traffic except from the application server on the required port.
This design creates a clear cardholder data environment (CDE) boundary. The dedicated firewall restricts access so only the application server can communicate with the database server on a specific port. The web server and application server can be placed outside the CDE if they do not directly transmit or store cardholder data, thereby reducing the PCI DSS scope.
C
Encrypt all data in transit using TLS and at rest using AES-256.
Why wrong: Encryption is a mandatory PCI DSS requirement for protecting cardholder data, but it does not reduce the scope of the assessment. The systems that handle encrypted data are still in scope because they process and store the data, even if encrypted. Scope reduction requires network segmentation, not encryption alone.
D
Implement network intrusion detection systems on all network segments.
Why wrong: Intrusion detection systems are detective controls and do not change which systems are in scope for PCI DSS. They can help with security monitoring but do not provide the architectural isolation needed to reduce the cardholder data environment.

Full breakdown with real-world context →

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

✓

Place the database server in a separate, isolated network segment with a dedicated firewall that blocks all traffic except from the application server on the required port.

Option B is correct because isolating the database server in a separate network segment with a dedicated firewall that restricts traffic to only the application server on the required port creates a clear network segmentation boundary. This segmentation limits the cardholder data environment (CDE) to just the database server, thereby minimizing the scope of the PCI DSS assessment by excluding the web and application servers from the CDE.

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.

✗
Place all servers in the same VLAN and apply a host-based firewall on the database server.
Why it's wrong here
Placing all servers in the same VLAN creates a flat network where any server can potentially communicate with the database server. This would include the web and application servers in the PCI DSS scope because they are on the same network segment and can directly connect to cardholder data, increasing the assessment scope.
✓
Place the database server in a separate, isolated network segment with a dedicated firewall that blocks all traffic except from the application server on the required port.
Why this is correct
This design creates a clear cardholder data environment (CDE) boundary. The dedicated firewall restricts access so only the application server can communicate with the database server on a specific port. The web server and application server can be placed outside the CDE if they do not directly transmit or store cardholder data, thereby reducing the PCI DSS scope.
Clue confirmation
The clue words "best", "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Encrypt all data in transit using TLS and at rest using AES-256.
Why it's wrong here
Encryption is a mandatory PCI DSS requirement for protecting cardholder data, but it does not reduce the scope of the assessment. The systems that handle encrypted data are still in scope because they process and store the data, even if encrypted. Scope reduction requires network segmentation, not encryption alone.
✗
Implement network intrusion detection systems on all network segments.
Why it's wrong here
Intrusion detection systems are detective controls and do not change which systems are in scope for PCI DSS. They can help with security monitoring but do not provide the architectural isolation needed to reduce the cardholder data environment.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse security controls (encryption, IDS) with architectural segmentation, mistakenly believing that encryption or monitoring alone can reduce PCI DSS scope, when only network isolation with a firewall boundary achieves that.

Detailed technical explanation

How to think about this question

PCI DSS scope reduction relies on network segmentation that isolates systems storing, processing, or transmitting cardholder data from all other systems. A dedicated firewall with stateful inspection and default-deny rules, allowing only specific source IPs and ports (e.g., TCP 3306 for MySQL), creates a controlled chokepoint that logically separates the CDE. In practice, this segmentation must be validated through network diagrams and firewall rule reviews to ensure no unauthorized paths exist, as even a single unblocked route can expand the assessed environment.

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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.

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 SY0-701 question test?

Security Architecture — This question tests Security Architecture — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Place the database server in a separate, isolated network segment with a dedicated firewall that blocks all traffic except from the application server on the required port. — Option B is correct because isolating the database server in a separate network segment with a dedicated firewall that restricts traffic to only the application server on the required port creates a clear network segmentation boundary. This segmentation limits the cardholder data environment (CDE) to just the database server, thereby minimizing the scope of the PCI DSS assessment by excluding the web and application servers from the CDE.

What should I do if I get this SY0-701 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: "best", "minimum / minimize". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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