Google PCA Ensure solution and operations reliability Practice Question
This PCA practice question tests your understanding of ensure solution and operations reliability. 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.
Your service has a 99.99% uptime SLO (monthly error budget ~ 4 minutes). Which TWO monitoring practices best support this SLO? (Choose 2)
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a combination of availability (e.g., HTTP 200 rate) and latency (e.g., p99) as SLIs.
Options B and D are correct. A good SLI combines availability and latency into a single measure; the error budget approach is the standard way to manage SLOs. Option A is wrong: CPU alone is not a user-facing SLI. Option C is wrong: Alerting on every 5xx error can lead to alert fatigue; better to alert based on error budget burn rate. Option E is wrong: Synthetic monitoring is useful but not alone sufficient; a combination of real and synthetic is recommended.
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.
✗
Monitor CPU utilization and alert when average exceeds 80%.
Why it's wrong here
CPU is an infrastructure metric, not an SLI; user-facing availability and latency are better.
✓
Use a combination of availability (e.g., HTTP 200 rate) and latency (e.g., p99) as SLIs.
Why this is correct
Good SLIs reflect user experience; availability and latency are common SLIs.
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.
✗
Use only synthetic monitoring from multiple locations.
Why it's wrong here
Synthetic monitoring is limited; real user monitoring complements it.
✗
Alert on every 5xx error immediately.
Why it's wrong here
Alerting on every 5xx leads to alert fatigue; use error budget burn rate alerts instead.
✓
Track error budget consumption and alert when burn rate exceeds a threshold.
Why this is correct
Error budget alerts give early warning of potential SLO violation.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
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.
Ensure solution and operations reliability — This question tests Ensure solution and operations reliability — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use a combination of availability (e.g., HTTP 200 rate) and latency (e.g., p99) as SLIs. — Options B and D are correct. A good SLI combines availability and latency into a single measure; the error budget approach is the standard way to manage SLOs. Option A is wrong: CPU alone is not a user-facing SLI. Option C is wrong: Alerting on every 5xx error can lead to alert fatigue; better to alert based on error budget burn rate. Option E is wrong: Synthetic monitoring is useful but not alone sufficient; a combination of real and synthetic is recommended.
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.
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Question Discussion
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