This 200-901 practice question tests your understanding of application deployment and security. 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.
During a security audit, it is found that a microservice exposes its internal IP address in error responses. This could help attackers map the network. What is the BEST remediation?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Use a service mesh to encrypt traffic.
Why wrong: Encryption does not hide the IP in error messages.
Log the errors and monitor them.
Why wrong: Does not prevent leakage.
Configure the application to return generic error messages without internal details.
Eliminates information leakage at the source.
Add a firewall to block external access to the service.
Why wrong: Network control but doesn't address the app behavior.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Configure the application to return generic error messages without internal details.
Option C is correct because exposing internal IP addresses in error responses violates the principle of least information disclosure. The best remediation is to configure the application to return generic error messages (e.g., HTTP 500 with a generic body) that strip out internal details like IP addresses, stack traces, or debug data. This prevents attackers from using error responses to map the internal network topology, a common information-gathering technique.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Use a service mesh to encrypt traffic.
Why it's wrong here
Encryption does not hide the IP in error messages.
Log the errors and monitor them.
Why it's wrong here
Does not prevent leakage.
Configure the application to return generic error messages without internal details.
Why this is correct
Eliminates information leakage at the source.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Add a firewall to block external access to the service.
Why it's wrong here
Network control but doesn't address the app behavior.
Common exam traps
Cisco often tests the misconception that network-level controls (firewalls, encryption) are sufficient to fix application-layer information disclosure, when in fact the application itself must sanitize its output.
Detailed technical explanation
Under the hood, this remediation is often implemented by configuring the web server or application framework to suppress detailed error pages. For example, in a Spring Boot application, setting `server.error.include-stacktrace=never` and `server.error.include-binding-errors=never` ensures that internal details like IP addresses are omitted from the JSON error response. In a production environment, this aligns with OWASP guidelines for error handling (e.g., using a generic 500 error page) and prevents information leakage that could be used in a network reconnaissance attack like a ping sweep or traceroute.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 200-901 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Application Deployment and Security — This question tests Application Deployment and Security — Read the scenario before looking for a memorised answer..
The correct answer is: Configure the application to return generic error messages without internal details. — Option C is correct because exposing internal IP addresses in error responses violates the principle of least information disclosure. The best remediation is to configure the application to return generic error messages (e.g., HTTP 500 with a generic body) that strip out internal details like IP addresses, stack traces, or debug data. This prevents attackers from using error responses to map the internal network topology, a common information-gathering technique.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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