PCSE Practice Question: Managing operations in a cloud solution environment
This PCSE practice question tests your understanding of managing operations in a cloud solution environment. 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.
An engineer notices that traffic on port 80 is not reaching instances with the tag 'http-server'. The instances have external IPs and are in the default VPC. What could be the reason?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A deny rule with a lower priority number (higher priority) exists and blocks the traffic.
Option B is correct because if a deny rule with a lower priority number (higher priority) exists, it will block traffic despite the allow rule. Option A is incorrect because sourceRanges includes all IPs. Option C is incorrect because the rule targets the correct tags. Option D is incorrect because direction is correctly INGRESS for incoming traffic.
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.
✗
The sourceRanges does not include the instance's public IP.
Why it's wrong here
sourceRanges is 0.0.0.0/0, which includes all public IPs.
✗
The targetTags are not applied to the instances.
Why it's wrong here
The problem states instances have the 'http-server' tag.
✓
A deny rule with a lower priority number (higher priority) exists and blocks the traffic.
Why this is correct
A deny rule with higher priority can override this allow rule.
Related concept
Standard ACLs match source addresses.
✗
The direction should be EGRESS.
Why it's wrong here
Traffic to the instances is ingress, so INGRESS is correct.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group 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 PCSE ACL questions on filtering logic and placement.
Managing operations in a cloud solution environment — This question tests Managing operations in a cloud solution environment — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: A deny rule with a lower priority number (higher priority) exists and blocks the traffic. — Option B is correct because if a deny rule with a lower priority number (higher priority) exists, it will block traffic despite the allow rule. Option A is incorrect because sourceRanges includes all IPs. Option C is incorrect because the rule targets the correct tags. Option D is incorrect because direction is correctly INGRESS for incoming traffic.
What should I do if I get this PCSE 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 PCSE ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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