mediumMultiple ChoiceObjective-mapped
CV0-004 Practice Question: A company operates a hybrid cloud environment…
A company operates a hybrid cloud environment with on-premises servers and a public cloud provider. They use AWS for compute and storage. Their application requires low-latency access to on-premises databases. They set up a Direct Connect link between their data center and AWS. Recently, users report slow application performance. Cloud engineers notice increased latency on the Direct Connect link. The on-premises network team confirms no issues with their internal network. The application uses jumbo frames on the on-premises side for optimized performance. The virtual interface on the AWS side is configured with a default MTU of 1500. Which of the following is the MOST likely cause of the increased latency?
⚠ Common exam trap
The trap here is that candidates often overlook the MTU mismatch and instead focus on routing or bandwidth issues, not realizing that fragmentation and reassembly directly cause increased latency without necessarily causing packet loss.
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 MTU on the virtual interface is set to 1500, causing fragmentation and reassembly delays.
The application uses jumbo frames on-premises, but the AWS virtual interface defaults to an MTU of 1500. When packets larger than 1500 bytes traverse the Direct Connect link, they must be fragmented at the on-premises router and reassembled at the AWS side. This fragmentation and reassembly process introduces significant processing overhead and latency, which explains the reported slow performance.
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 MTU on the virtual interface is set to 1500, causing fragmentation and reassembly delays.
Why this is correct
The MTU mismatch forces fragmentation, increasing latency.
- ✗
The on-premises router has not configured BGP graceful restart for the Direct Connect session.
Why it's wrong here
Graceful restart affects BGP convergence after failure, not normal operation latency.
- ✗
The cloud provider's routing table has not propagated the latest on-premises prefixes, causing traffic to take a suboptimal path.
Why it's wrong here
Route propagation failure would cause traffic to fail over to a backup path or drop, not simply increase latency.
- ✗
The Direct Connect link bandwidth is oversubscribed, causing packet loss and retransmission delays.
Why it's wrong here
Oversubscription leads to drops and retransmissions, but the scenario's latency increase is more consistent with fragmentation from MTU mismatch.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
Related to this question
About these practice questions
One of 977 original CV0-004 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
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.