- A
Immediately rollback any recent changes to prevent further errors.
Why wrong: Rollback may be premature without understanding the root cause; the error is within budget.
- B
Disable monitoring alerts for the error rate to avoid false alarms.
Why wrong: Alerting is important; disabling it is counterproductive.
- C
Conduct a blameless postmortem to understand the root cause and prevent recurrence.
Blameless postmortems are key to learning and improving reliability.
- D
Accept the incident as within the error budget and focus on other improvements.
The error rate (0.005%) is within the budget (0.01%), so it's acceptable according to SRE.
- E
Increase capacity proactively for anticipated future spikes.
Capacity planning based on observed patterns is a good SRE practice.
Google PCA Practice Question: Analysing and Optimising Technical and Business Processes
This PCA practice question tests your understanding of analysing and optimising technical and business processes. 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.
An organization runs a critical application on Compute Engine with a 99.99% SLO. They have set an error budget of 0.01% over a 30-day window. Recently, an unexpected traffic spike caused a 0.005% error rate for a few hours. Which THREE actions align with SRE best practices? (Choose 3)
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.
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
Conduct a blameless postmortem to understand the root cause and prevent recurrence.
SRE best practices include using error budgets to drive decisions, conducting blameless postmortems, and adjusting capacity based on usage. Relying on past data and ignoring the spike is not proactive.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Immediately rollback any recent changes to prevent further errors.
Why it's wrong here
Rollback may be premature without understanding the root cause; the error is within budget.
- ✗
Disable monitoring alerts for the error rate to avoid false alarms.
Why it's wrong here
Alerting is important; disabling it is counterproductive.
- ✓
Conduct a blameless postmortem to understand the root cause and prevent recurrence.
Why this is correct
Blameless postmortems are key to learning and improving reliability.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
Accept the incident as within the error budget and focus on other improvements.
Why this is correct
The error rate (0.005%) is within the budget (0.01%), so it's acceptable according to SRE.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
Increase capacity proactively for anticipated future spikes.
Why this is correct
Capacity planning based on observed patterns is a good SRE practice.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCA NAT questions on configuration and troubleshooting.
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Analysing and Optimising Technical and Business Processes — study guide chapter
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FAQ
Questions learners often ask
What does this PCA question test?
Analysing and Optimising Technical and Business Processes — This question tests Analysing and Optimising Technical and Business Processes — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Conduct a blameless postmortem to understand the root cause and prevent recurrence. — SRE best practices include using error budgets to drive decisions, conducting blameless postmortems, and adjusting capacity based on usage. Relying on past data and ignoring the spike is not proactive.
What should I do if I get this PCA question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCA NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". 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?
Static NAT maps one inside address to one outside address.
About these practice questions
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Last reviewed: Jul 4, 2026
This PCA practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCA exam.
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