- A
The MTU on the virtual interface is set to 1500, causing fragmentation and reassembly delays.
The MTU mismatch forces fragmentation, increasing latency.
- B
The on-premises router has not configured BGP graceful restart for the Direct Connect session.
Why wrong: Graceful restart affects BGP convergence after failure, not normal operation latency.
- C
The cloud provider's routing table has not propagated the latest on-premises prefixes, causing traffic to take a suboptimal path.
Why wrong: Route propagation failure would cause traffic to fail over to a backup path or drop, not simply increase latency.
- D
The Direct Connect link bandwidth is oversubscribed, causing packet loss and retransmission delays.
Why wrong: Oversubscription leads to drops and retransmissions, but the scenario's latency increase is more consistent with fragmentation from MTU mismatch.
Quick Answer
The answer is the MTU mismatch between the on-premises jumbo frames and the AWS virtual interface default of 1500, which causes fragmentation and reassembly delays. When the on-premises network sends jumbo frames (typically 9001 bytes) over the Direct Connect link, the router must fragment each oversized packet into smaller 1500-byte chunks to match the virtual interface’s MTU. The receiving side then reassembles these fragments, and this processing overhead directly increases Direct Connect latency, degrading application performance. On the CompTIA Cloud+ CV0-004 exam, this scenario tests your understanding of how MTU configuration impacts hybrid cloud connectivity—a common trap is assuming latency stems from bandwidth or routing issues rather than packet fragmentation. Remember the memory tip: “Jumbo frames need jumbo MTU; a 1500 ceiling means fragmentation is the feeling.”
CV0-004 Cloud Architecture and Design Practice Question
This CV0-004 practice question tests your understanding of cloud architecture and design. 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.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Trap categories for this question
Scenario analysis trap
Oversubscription leads to drops and retransmissions, but the scenario's latency increase is more consistent with fragmentation from MTU mismatch.
Detailed technical explanation
How to think about this question
Jumbo frames (typically 9001 bytes on AWS) reduce CPU overhead and improve throughput by allowing more data per packet. When a jumbo frame hits a link with a lower MTU, the router must fragment the packet into smaller IP fragments, each with its own header. The receiving end must then reassemble these fragments, which consumes CPU cycles and adds delay. This is a common issue in hybrid cloud setups where on-premises networks are configured for jumbo frames but the cloud virtual interface defaults to standard Ethernet MTU.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this CV0-004 question test?
Cloud Architecture and Design — This question tests Cloud Architecture and Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this CV0-004 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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