CV0-004 Troubleshooting Practice Question
Exhibit
error log: [ERROR] azcopy: failed to perform copy command: The request failed due to: Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature.
Refer to the exhibit. A cloud engineer is using AzCopy to transfer files to Azure Blob Storage. The copy fails with the above error. Which of the following is the most likely cause?
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
✓
The SAS token used has expired
The error explicitly indicates an authentication failure, which is typically due to an expired or invalid SAS token. Option A is wrong because a firewall block would result in a different error (e.g., 403 Forbidden). Option C is wrong because a non-existent container would return a 404 error. Option D is wrong because insufficient throughput would cause a timeout, not an authentication error.
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 network throughput is insufficient
Why it's wrong here
Low throughput would cause slow transfers or timeouts, not authentication errors.
- ✓
The SAS token used has expired
Why this is correct
An expired SAS token causes the server to reject the request with this exact error.
- ✗
The storage account firewall is blocking the IP
Why it's wrong here
Firewall blocks cause forbidden errors, not authentication failures.
- ✗
The destination container does not exist
Why it's wrong here
A missing container results in a 'not found' error.
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
Go deeper
Related to this question
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.