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. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Refer to the exhibit. A developer working from a workstation with IP 203.0.113.5 cannot SSH to a VM in the my-vpc network. Which firewall rule is most likely blocking the connection?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
deny-ssh-all
Option C is correct because the deny-ssh-all rule has a priority of 200 (higher priority than the allow rules at 500 and 1000) and blocks SSH from all IPs. The order in GCP is based on priority (lower number = higher priority), so the deny overrides the allows. The allow-ssh-from-bastion only permits SSH from 10.0.1.2, not the developer's IP.
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.
✗
allow-ssh-from-bastion
Why it's wrong here
This rule allows SSH only from the bastion IP 10.0.1.2; it does not block other traffic, but the deny rule is what blocks the developer.
✓
deny-ssh-all
Why this is correct
This rule denies SSH from all IPs with a higher priority, blocking all SSH traffic.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Although this rule allows SSH from all IPs, it has a lower priority (1000) than the deny rule (200).
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: deny-ssh-all — Option C is correct because the deny-ssh-all rule has a priority of 200 (higher priority than the allow rules at 500 and 1000) and blocks SSH from all IPs. The order in GCP is based on priority (lower number = higher priority), so the deny overrides the allows. The allow-ssh-from-bastion only permits SSH from 10.0.1.2, not the developer's IP.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Standard ACLs match source addresses.
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