The correct action is to block the email and notify the security team. This is because the data classification policy enforcement JSON explicitly prohibits transmitting Confidential data via unencrypted email, requiring either a VPN or encrypted email channel to satisfy the policy. On the CompTIA SecurityX CAS-004 exam, this scenario tests your ability to interpret machine-readable policy rules and apply them to real-world email flows, a common trap being the assumption that blocking alone is sufficient without alerting the security team for incident response. Remember the mnemonic “BAN” — Block, Alert, Notify — to reinforce that enforcement must always include a notification step when a policy violation is detected.
CAS-004 Governance, Risk and Compliance Practice Question
This CAS-004 practice question tests your understanding of governance, risk and compliance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Exhibit
Refer to the exhibit.
{
"dataClassification": {
"policyName": "Corporate Data Classification",
"version": "2.1",
"categories": [
{
"label": "Public",
"allowedStorage": ["SharePoint Online"],
"allowedTransmission": ["Email (unencrypted)"]
},
{
"label": "Internal",
"allowedStorage": ["SharePoint Online", "On-premises file server"],
"allowedTransmission": ["Email with TLS", "VPN"]
},
{
"label": "Confidential",
"allowedStorage": ["On-premises encrypted database"],
"allowedTransmission": ["VPN only", "Encrypted email"]
},
{
"label": "Restricted",
"allowedStorage": ["Air-gapped system"],
"allowedTransmission": ["None (physical transfer only)"]
}
]
},
"event": "User attempted to send a document classified as 'Confidential' via unencrypted email."
}
Refer to the exhibit. Based on the data classification policy JSON, what action is MOST consistent with the policy?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Block the email and notify the security team
Option A is correct because the policy states that Confidential data must be transmitted via VPN or encrypted email; unencrypted email is not allowed, so the transmission should be blocked. Option B is wrong because the policy does not permit downgrading classification. Option C is wrong because no override clause is indicated. Option D is wrong because unencrypted email is explicitly prohibited.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Block the email and notify the security team
Why this is correct
The policy prohibits unencrypted transmission of Confidential data.
Related concept
Standard ACLs match source addresses.
✗
Allow the email but reclassify the document as 'Internal'
Why it's wrong here
Reclassification without authorization is not permitted.
✗
Allow the email with an exception request
Why it's wrong here
No exception process is defined.
✗
Encrypt the email automatically with S/MIME
Why it's wrong here
Policy requires VPN or encrypted email, but S/MIME may not be configured; blocking is safest.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related CAS-004 ACL questions on filtering logic and placement.
Governance, Risk and Compliance — This question tests Governance, Risk and Compliance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Block the email and notify the security team — Option A is correct because the policy states that Confidential data must be transmitted via VPN or encrypted email; unencrypted email is not allowed, so the transmission should be blocked. Option B is wrong because the policy does not permit downgrading classification. Option C is wrong because no override clause is indicated. Option D is wrong because unencrypted email is explicitly prohibited.
What should I do if I get this CAS-004 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related CAS-004 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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