The answer is insufficient VIF bandwidth for the traffic volume, as bursty peak-hour traffic can exceed the provisioned capacity of the Direct Connect virtual interface, causing congestion that directly manifests as latency and packet loss. This occurs because a private VIF has a fixed bandwidth cap, and when traffic spikes during peak hours, packets are queued or dropped rather than throttled, unlike AWS VPN which can burst to higher limits. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding that Direct Connect congestion is almost always a bandwidth sizing issue, not a BGP or MTU problem—a common trap is to blame jumbo frames or routing timers, but those affect throughput or convergence, not congestion. Remember the memory tip: “Peak-hour packet loss points to port capacity, not protocol problems.”
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. 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.
A company is using AWS Direct Connect to connect its on-premises data center to AWS. The network team notices increased latency and packet loss during peak hours. The Direct Connect virtual interface (VIF) is configured as a private VIF to a VPC. What is the MOST likely cause of the issue?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The VIF bandwidth is insufficient for the traffic volume.
Option C is correct because bursty traffic can exceed the VIF bandwidth and cause congestion, leading to latency and packet loss. Option A is incorrect because BGP timers affect routing convergence, not bandwidth. Option B is incorrect because jumbo frames would improve throughput, not cause packet loss. Option D is incorrect because the issue is during peak hours, not a persistent MTU mismatch.
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.
✗
Jumbo frames are not enabled on the VIF.
Why it's wrong here
Jumbo frames would improve performance, not cause packet loss.
✓
The VIF bandwidth is insufficient for the traffic volume.
Why this is correct
Bursty traffic can exceed the provisioned bandwidth, causing congestion.
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 BGP keepalive timer is set too low.
Why it's wrong here
BGP timers affect routing stability, not bandwidth congestion.
✗
The MTU size of the VIF is set to 1500 bytes.
Why it's wrong here
Standard MTU should not cause packet loss unless there is a mismatch.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Network Management and Operations — This question tests Network Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The VIF bandwidth is insufficient for the traffic volume. — Option C is correct because bursty traffic can exceed the VIF bandwidth and cause congestion, leading to latency and packet loss. Option A is incorrect because BGP timers affect routing convergence, not bandwidth. Option B is incorrect because jumbo frames would improve throughput, not cause packet loss. Option D is incorrect because the issue is during peak hours, not a persistent MTU mismatch.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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Question Discussion
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