GPEN Pen Test Planning Practice Question
During the scoping phase of a penetration test for a global e-commerce client, you identify that the client uses a cloud-based Content Delivery Network (CDN) to host static assets. Which action is the most critical for ensuring the engagement remains within the Rules of Engagement (RoE)?
⚠ Common exam trap
Candidates often assume cloud assets owned by the client can be freely scanned without checking if third-party CDN providers require explicit authorization.
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
✓
Verify if the client has explicit written permission from the CDN provider.
Testing a CDN often involves third-party infrastructure that falls outside the client's direct control. Testing these assets without explicit authorization from the CDN provider can trigger automated DDoS mitigations or legal disputes. Confirming whether the CDN is in-scope prevents accidental service disruption and potential contractual violations, ensuring the pentest methodology adheres to legal boundaries and professional standards regarding third-party service provider interaction.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Perform a SYN scan against the CDN IP ranges to identify open ports.
Why it's wrong here
Scanning CDN infrastructure typically triggers automated incident response systems maintained by the provider. This generates unnecessary noise, potentially leads to a temporary block of the testing IP addresses, and risks violating the provider's terms of service, which the client does not have the authority to override.
- ✗
Incorporate the CDN provider's IP space into the primary target scope.
Why it's wrong here
Including a third-party CDN provider in the scope without their written consent is a major operational risk. Cloud providers strictly prohibit unauthorized penetration testing against their backbone infrastructure, and the client cannot legally authorize testing on hardware or software that they do not own or manage.
- ✓
Verify if the client has explicit written permission from the CDN provider.
Why this is correct
Verifying written permission is necessary because CDNs are external service providers. Testing them without authorization is a violation of the Rules of Engagement. Obtaining documented consent ensures that the testing activity is permitted under the provider's acceptable use policy, mitigating legal risks for both the tester and the client.
- ✗
Bypass the CDN by mapping the origin server's IP address directly.
Why it's wrong here
Bypassing the CDN to attack the origin server directly often violates the implicit boundaries of the engagement. While it may reveal vulnerabilities on the origin server, it ignores the security controls provided by the CDN, which are part of the target environment the client intends to secure.
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 September 2026 · checked against the official GIAC exam blueprint
This GPEN practice question is part of Courseiva's free GIAC 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 GPEN exam.