PCDOE Optimizing service performance Practice Question
This PCDOE practice question tests your understanding of optimizing service performance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 application running on App Engine standard environment has high instance startup latency, leading to slow first requests. What is the most effective configuration change to reduce cold starts?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set min_idle_instances to a value greater than 0
Setting a minimum number of idle instances ensures that instances are always ready to serve traffic, eliminating startup delays. Manual scaling (A) requires manual capacity planning; increasing memory (C) may not reduce startup time; Cloud Endpoints (D) is for API management.
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.
✗
Use manual scaling instead of automatic scaling
Why it's wrong here
Manual scaling does not automatically keep idle instances; you must set min_idle_instances.
✗
Use Cloud Endpoints for request authentication
Why it's wrong here
Cloud Endpoints adds API management but does not affect instance startup latency.
✓
Set min_idle_instances to a value greater than 0
Why this is correct
This ensures that a pool of warm instances is always available, reducing cold start latency.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Increase the memory limit per instance
Why it's wrong here
More memory may not reduce instance startup time; the issue is initial setup, not memory.
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
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 PCDOE NAT questions on configuration and troubleshooting.
Optimizing service performance — This question tests Optimizing service performance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Set min_idle_instances to a value greater than 0 — Setting a minimum number of idle instances ensures that instances are always ready to serve traffic, eliminating startup delays. Manual scaling (A) requires manual capacity planning; increasing memory (C) may not reduce startup time; Cloud Endpoints (D) is for API management.
What should I do if I get this PCDOE 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 PCDOE NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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