DBS-C01 Monitoring and Troubleshooting Practice Question
This DBS-C01 practice question tests your understanding of monitoring and troubleshooting. 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 database specialist is troubleshooting an automation script that fails when trying to create a snapshot of the RDS DB instance 'mydb' using an IAM role with the attached policy. The error message indicates that the user is not authorized to perform the operation. Which statement best explains the failure?
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
✓
The policy does not grant the rds:CreateDBSnapshot permission on the DB instance resource.
Option D is correct because the rds:CreateDBSnapshot action requires permission on the DB instance resource (arn:aws:rds:region:account:db:instance-name). The IAM policy in the exhibit only grants this action on the snapshot resource (arn:aws:rds:region:account:snapshot:*), not on the DB instance, causing the authorization failure. Options A and B are incorrect because they either mention an irrelevant action or misidentify the resource. Option C is incorrect because the policy does allow rds:CreateDBSnapshot on the snapshot resource, but the missing permission on the DB instance is the actual issue.
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.
✗
The resource ARN for the snapshot is incorrect; it should specify the DB instance ID.
Why it's wrong here
Snapshot ARN is correct; the issue is missing permission on the DB instance.
✗
The policy does not allow the rds:DescribeDBInstances action on the snapshot resource.
Why it's wrong here
DescribeDBInstances is not needed for creating snapshots.
✗
The policy does not allow the rds:CreateDBSnapshot action on the specific snapshot name.
Why it's wrong here
The action is allowed on all snapshots.
✓
The policy does not grant the rds:CreateDBSnapshot permission on the DB instance resource.
Why this is correct
CreateDBSnapshot requires permission on the DB instance.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Authentication checks who the user is.
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 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 Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DBS-C01 questions on access control and AAA configuration.
Monitoring and Troubleshooting — This question tests Monitoring and Troubleshooting — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: The policy does not grant the rds:CreateDBSnapshot permission on the DB instance resource. — Option D is correct because the rds:CreateDBSnapshot action requires permission on the DB instance resource (arn:aws:rds:region:account:db:instance-name). The IAM policy in the exhibit only grants this action on the snapshot resource (arn:aws:rds:region:account:snapshot:*), not on the DB instance, causing the authorization failure. Options A and B are incorrect because they either mention an irrelevant action or misidentify the resource. Option C is incorrect because the policy does allow rds:CreateDBSnapshot on the snapshot resource, but the missing permission on the DB instance is the actual issue.
What should I do if I get this DBS-C01 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 DBS-C01 questions on access control and AAA configuration.
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?
Authentication checks who the user is.
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Question Discussion
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