Question 620
In an AWS networking assessment, reachability Analyzer reports an unreachable path because the destination security group lacks a needed inbound port. Which technical explanation BEST accounts for the observed condition?
Explanation
Correct Answer
A missing allowed port prevents traffic even if subnet routes and ENIs are otherwise present. This explains the observed network behavior, which can be checked by verifying that the same analysis reports a reachable path after the scoped rule correction.
Incorrect Answers
Layer-three/four flow metadata cannot reveal encrypted HTTP resource paths. For the stated conditions, a missing allowed port prevents traffic even if subnet routes and ENIs are otherwise present. The more specific mechanism is reachability Analyzer models configured path controls and can identify a blocking security-group rule.
The default record shape may omit fields needed for reliable SYN-only or RST event classification. The decisive technical distinction is reachability Analyzer models configured path controls and can identify a blocking security-group rule; a missing allowed port prevents traffic even if subnet routes and ENIs are otherwise present.
Generating records does not guarantee they remain accessible for regulatory evidence duration. For the stated conditions, a missing allowed port prevents traffic even if subnet routes and ENIs are otherwise present. The more specific mechanism is reachability Analyzer models configured path controls and can identify a blocking security-group rule.






AWS Certified Advanced Networking - Specialty ANS-C01 Practice Tests