- A
Deploy new revision with 0% traffic, then shift a small percentage of traffic to it, then monitor, then gradually increase traffic, then remove old revision.
This is the correct order because you first deploy the new revision without serving traffic, then route a small percentage to validate it, monitor for issues, gradually increase traffic if successful, and finally delete the old revision once confident.
- B
Shift a small percentage of traffic to the new revision, then deploy the new revision, then monitor, then gradually increase traffic, then remove old revision.
Why wrong: This is incorrect because you cannot shift traffic to a revision that hasn't been deployed yet. Deploying must come before traffic shifting.
- C
Deploy new revision with 0% traffic, then gradually increase traffic to 100%, then monitor, then remove old revision.
Why wrong: This is incorrect because monitoring should occur before fully scaling up traffic. Ramping to 100% without monitoring risks exposing all users to a faulty revision.
- D
Deploy new revision with 0% traffic, then shift a small percentage of traffic, then remove old revision, then monitor, then gradually increase traffic.
Why wrong: This is incorrect because the old revision should remain until the new one is validated. Removing it before monitoring could cause downtime if the new revision fails.
Canary Deployment Steps for Cloud Run
This PCDOE practice question tests your understanding of optimizing service performance. 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.
Arrange the steps to implement a canary deployment for a Cloud Run service.
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
Deploy new revision with 0% traffic, then shift a small percentage of traffic to it, then monitor, then gradually increase traffic, then remove old revision.
In a canary deployment for Cloud Run, the correct sequence ensures minimal risk. First, deploy the new revision with 0% traffic. Then, route a small percentage (e.g., 1%) to it and monitor for errors or performance issues. If successful, gradually increase traffic while monitoring. Once the new revision is fully validated, point 100% traffic to it and remove the old revision. This incremental approach limits blast radius and allows rollback.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Deploy new revision with 0% traffic, then shift a small percentage of traffic to it, then monitor, then gradually increase traffic, then remove old revision.
Why this is correct
This is the correct order because you first deploy the new revision without serving traffic, then route a small percentage to validate it, monitor for issues, gradually increase traffic if successful, and finally delete the old revision once confident.
Related concept
Authentication checks who the user is.
- ✗
Shift a small percentage of traffic to the new revision, then deploy the new revision, then monitor, then gradually increase traffic, then remove old revision.
Why it's wrong here
This is incorrect because you cannot shift traffic to a revision that hasn't been deployed yet. Deploying must come before traffic shifting.
- ✗
Deploy new revision with 0% traffic, then gradually increase traffic to 100%, then monitor, then remove old revision.
Why it's wrong here
This is incorrect because monitoring should occur before fully scaling up traffic. Ramping to 100% without monitoring risks exposing all users to a faulty revision.
- ✗
Deploy new revision with 0% traffic, then shift a small percentage of traffic, then remove old revision, then monitor, then gradually increase traffic.
Why it's wrong here
This is incorrect because the old revision should remain until the new one is validated. Removing it before monitoring could cause downtime if the new revision fails.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
What to study next
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related PCDOE questions on access control and AAA configuration.
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FAQ
Questions learners often ask
What does this PCDOE question test?
Optimizing service performance — This question tests Optimizing service performance — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Deploy new revision with 0% traffic, then shift a small percentage of traffic to it, then monitor, then gradually increase traffic, then remove old revision. — In a canary deployment for Cloud Run, the correct sequence ensures minimal risk. First, deploy the new revision with 0% traffic. Then, route a small percentage (e.g., 1%) to it and monitor for errors or performance issues. If successful, gradually increase traffic while monitoring. Once the new revision is fully validated, point 100% traffic to it and remove the old revision. This incremental approach limits blast radius and allows rollback.
What should I do if I get this PCDOE question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related PCDOE questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Last reviewed: Jun 11, 2026
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