Question 180
An identity and device-administration engineer evaluates: An industrial printer has no supplicant and is denied by 802.1X, but security policy permits the printer only to a designated print server. Which measurable outcome proves the intended behavior?
Explanation
Correct Answer
The approved printer reaches its print server and an unregistered MAC cannot access the protected network. The required remediation is: Register the printer's endpoint MAC as an authorized internal endpoint and configure a tightly scoped MAB authorization profile. It works because mAC Authentication Bypass uses the endpoint MAC identifier as an authentication basis, so access must be constrained because MACs can be impersonated.
Incorrect Answers
Reduce the MAB role to least privilege and supplement admission with profiling, port context, or stronger supported controls where feasible. The repeat risk here is different: Register the printer's endpoint MAC as an authorized internal endpoint and configure a tightly scoped MAB authorization profile. A directly relevant preventive control is: The approved printer reaches its print server and an unregistered MAC cannot access the protected network.
Replace the catch-all MAB authorization with an explicit known-endpoint group and a deny or isolation result for unknown MACs. The repeat risk here is different: Register the printer's endpoint MAC as an authorized internal endpoint and configure a tightly scoped MAB authorization profile. A directly relevant preventive control is: The approved printer reaches its print server and an unregistered MAC cannot access the protected network.
Select a supported 802.1X host mode such as multi-domain when one voice endpoint and one data endpoint must authenticate separately. The repeat risk here is different: Register the printer's endpoint MAC as an authorized internal endpoint and configure a tightly scoped MAB authorization profile. A directly relevant preventive control is: The approved printer reaches its print server and an unregistered MAC cannot access the protected network.