ISC Infrastructure And System Security Practice Question
You need to protect a legacy web application that cannot be patched. What is the best strategy?
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
✓
Deploy a WAF to provide virtual patching.
Placing a Web Application Firewall (WAF) or an RASP solution in front of the application can filter malicious traffic before it reaches the vulnerable application.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable all logging.
Why it's wrong here
Disabling logging makes it impossible to detect attacks.
- ✓
Deploy a WAF to provide virtual patching.
Why this is correct
Virtual patching through a WAF is the standard defense for unpatchable legacy apps.
- ✗
Migrate the app to a new language.
Why it's wrong here
This is not always feasible for legacy apps.
- ✗
Isolate the server on an isolated VLAN.
Why it's wrong here
Isolation prevents access, which likely breaks the application's functionality.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official (ISC)² exam blueprint
This ISC practice question is part of Courseiva's free (ISC)² 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 ISC exam.