The answer is to monitor Amazon CloudWatch metrics for the VPN tunnel, specifically the TunnelState and data throughput metrics, as this is the most effective way to detect VPN tunnel interception. CloudWatch’s TunnelState metric directly reveals whether the tunnel is up or down, and a compromised tunnel that is intercepting traffic will often flap or drop unexpectedly, while abnormal throughput patterns—such as sudden spikes or drops—signal potential rerouting or interception of traffic. On the AWS Certified Security Specialty SCS-C02 exam, this question tests your understanding of monitoring-based detection over content inspection, since VPN encryption prevents you from analyzing the traffic itself. A common trap is to choose packet inspection or log analysis, but those are ineffective for encrypted tunnels. Remember the memory tip: “State and rate reveal the gate”—tunnel state and data rate changes are your primary indicators of compromise.
SCS-C02 Threat Detection and Incident Response Practice Question
This SCS-C02 practice question tests your understanding of threat detection and incident response. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 uses a hybrid architecture with on-premises servers and AWS. The company uses AWS Site-to-Site VPN to connect to a VPC. The security team suspects that a VPN tunnel has been compromised and an attacker is intercepting traffic. The team needs to verify the integrity of the VPN connection. What is the MOST effective way to detect if traffic is being intercepted?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Monitor Amazon CloudWatch metrics for the VPN tunnel, such as tunnel state and data throughput.
Option A is correct because monitoring Amazon CloudWatch metrics for the VPN tunnel, specifically the 'TunnelState' metric, directly indicates whether the tunnel is up or down. A compromised tunnel that is intercepting traffic would likely cause the tunnel to flap or drop unexpectedly, which CloudWatch can alert on. Additionally, abnormal data throughput patterns (e.g., sudden spikes or drops) can signal interception or rerouting of traffic, making this the most effective way to detect integrity issues without relying on traffic content.
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.
✓
Monitor Amazon CloudWatch metrics for the VPN tunnel, such as tunnel state and data throughput.
Why this is correct
Anomalies in metrics can indicate issues.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use AWS Config to check VPN configuration compliance.
Why it's wrong here
Config checks configuration, not traffic integrity.
✗
Use a third-party network monitoring tool to perform deep packet inspection.
Why it's wrong here
Not native and may not be practical.
✗
Enable VPC Flow Logs and analyze traffic patterns for unusual destinations.
Why it's wrong here
Does not indicate interception.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse configuration compliance (AWS Config) or traffic analysis (VPC Flow Logs) with active tunnel integrity verification, overlooking that CloudWatch metrics directly monitor the VPN tunnel's operational state and performance, which is the most reliable indicator of compromise without requiring decryption.
Detailed technical explanation
How to think about this question
AWS Site-to-Site VPN uses IPsec tunnels (IKEv1 or IKEv2) with encryption (AES-256) and authentication (SHA-256). The CloudWatch 'TunnelState' metric is a binary 0/1 value reported every minute from the AWS side; a state change to 0 indicates the tunnel is down, which could result from a man-in-the-middle attack causing rekey failures or packet loss. Real-world scenarios include an attacker forcing a tunnel renegotiation to downgrade encryption or inject malicious routes, which would manifest as tunnel instability or throughput anomalies detectable via CloudWatch alarms.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Threat Detection and Incident Response — This question tests Threat Detection and Incident Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Monitor Amazon CloudWatch metrics for the VPN tunnel, such as tunnel state and data throughput. — Option A is correct because monitoring Amazon CloudWatch metrics for the VPN tunnel, specifically the 'TunnelState' metric, directly indicates whether the tunnel is up or down. A compromised tunnel that is intercepting traffic would likely cause the tunnel to flap or drop unexpectedly, which CloudWatch can alert on. Additionally, abnormal data throughput patterns (e.g., sudden spikes or drops) can signal interception or rerouting of traffic, making this the most effective way to detect integrity issues without relying on traffic content.
What should I do if I get this SCS-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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