CV0-004 Troubleshooting Practice Question
A hybrid cloud setup uses a site-to-site VPN between on-premises and a public cloud. Users report intermittent connectivity failures. Traceroutes show packets dropping after a specific hop. What 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 MTU setting on the VPN endpoint is too low, causing packet fragmentation.
An MTU mismatch within the VPN tunnel can cause packets to be fragmented or dropped when they exceed the MTU size, leading to intermittent connectivity issues. Traceroute showing drops after a specific hop suggests fragmentation problems. Option A is incorrect: missing routes would cause complete lack of connectivity, not intermittent drops. Option B is incorrect: incorrect pre-shared keys would prevent the VPN tunnel from establishing at all. Option C is incorrect: an overloaded gateway might cause latency or failures but typically not specific hop drops in traceroute.
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 routing tables on the cloud side are missing routes for the on-premises network.
Why it's wrong here
Traceroute shows valid path until drop.
- ✗
The VPN tunnel is misconfigured with incorrect pre-shared keys.
Why it's wrong here
Authentication failures would bring the tunnel down entirely.
- ✗
The VPN gateway is overloaded due to too many tunnels.
Why it's wrong here
Overload would affect all traffic, not just specific hops.
- ✓
The MTU setting on the VPN endpoint is too low, causing packet fragmentation.
Why this is correct
Low MTU can cause packets to be dropped if DF flag is set.
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.