Question 290
A switch port is configured to accept tags from an untrusted endpoint. Which testing or remediation action is most appropriate?
Explanation
Correct Answer
Assess VLAN hopping risk within a dedicated lab switch and avoid production disruption. This answer directly addresses the described constraint. Incorrect trunk or native VLAN settings can break intended network segregation. Successful validation requires: A lab segmentation test shows untrusted frames cannot reach protected VLANs.
Incorrect Answers
This action applies to a different case: A test host's ARP poisoning protection rejects an untrusted gateway claim. Network access checks can prevent an on-path position before application traffic. It does not establish the present requirement, where a lab segmentation test shows untrusted frames cannot reach protected VLANs. The appropriate action is: Assess VLAN hopping risk within a dedicated lab switch and avoid production disruption.
That approach concerns a different situation: a network appliance's HTTP admin login is open on a management VLAN shared with guests. Guest-to-admin reachability increases risk irrespective of password strength. The required result is that a lab segmentation test shows untrusted frames cannot reach protected VLANs. The appropriate action is: Assess VLAN hopping risk within a dedicated lab switch and avoid production disruption.
That relates to a different issue: A captured lab TCP session reveals an intermediary can see unencrypted application data. Traffic traversing an attacker-controlled segment can expose plaintext. That is not a direct remedy for the requested outcome: A lab segmentation test shows untrusted frames cannot reach protected VLANs. The appropriate action is: Assess VLAN hopping risk within a dedicated lab switch and avoid production disruption.