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CV0-004 Practice Question: A company has a hybrid cloud environment with an…
A company has a hybrid cloud environment with an on-premises data center and Microsoft Azure. The on-premises infrastructure includes a VPN gateway connected to an Azure virtual network via site-to-site VPN. The network team reports that traffic from on-premises to Azure is experiencing high latency and packet loss. The VPN tunnel status shows as connected. The team has verified that the on-premises firewall is not dropping packets. The Azure administrator checks the virtual network gateway metrics and sees high inbound packet drops and a high number of VPN tunnel rekeys. What is the MOST likely cause of the issue?
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 VPN gateway SKU is too small for the traffic volume.
The high inbound packet drops and frequent VPN tunnel rekeys indicate that the VPN gateway is overwhelmed by traffic. A VPN gateway SKU that is too small for the traffic volume cannot handle the throughput, leading to packet drops and forcing the tunnel to rekey more often as it struggles to maintain the connection. This explains the high latency and packet loss despite the tunnel showing as connected. Option A (incorrect encryption algorithms) would prevent tunnel establishment or cause constant renegotiation, not just increased rekeys and drops. Option B (overlapping address space) would cause routing conflicts, not specifically packet drops and rekeys. Option C (misconfigured local network gateway address space) would result in connectivity failure or traffic not being routed correctly, not packet drops and rekeys within a functioning tunnel.
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 on-premises VPN device does not support the same encryption algorithms.
Why it's wrong here
If algorithms mismatch, the tunnel would fail to establish or drop continuously, not just show high rekeys.
- ✗
The Azure virtual network has overlapping address space with on-premises.
Why it's wrong here
Overlapping addresses cause asymmetric routing and connectivity issues, not specifically gateway packet drops.
- ✗
There is a misconfiguration in the local network gateway address space.
Why it's wrong here
Address space misconfiguration usually results in inability to route traffic, not packet drops and rekeys.
- ✓
The VPN gateway SKU is too small for the traffic volume.
Why this is correct
Under-provisioned gateways drop packets under load and trigger rekeys due to timeouts.
Visual reference
Quick reference
Symmetric Encryption Algorithm Comparison
| Algorithm | Key Size | Block Size | Status | Notes |
|---|---|---|---|---|
| AES-128 | 128-bit | 128-bit | Current standard | NIST approved; WPA3, TLS |
| AES-256 | 256-bit | 128-bit | Current standard | Preferred for sensitive / govt data |
| 3DES | 112-bit effective | 64-bit | Deprecated (2023) | Replaced by AES |
| DES | 56-bit | 64-bit | Broken | Cracked in < 24 h; never deploy |
| ChaCha20 | 256-bit | Stream cipher | Current | TLS 1.3, WireGuard |
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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.