Question 890
A badge reader has no supplicant and requires carefully limited wired connectivity through Cisco ISE. Which Cisco security control or operational response BEST addresses the stated need?
Explanation
Correct Answer
Use MAC Authentication Bypass only for supported non-802.1X devices with restricted roles and inventory-backed policy. This control addresses the failure mechanism and narrows the enforcement boundary. MAB relies on spoofable MAC identity and should be treated as lower-assurance admission, not an equivalent replacement for EAP-TLS. Confirm pre-change conditions using: Inspect known endpoint MAC registrations, profiling data, switch authentication order, RADIUS policy, and allowed destination flows. Situation: A badge reader has no supplicant and requires carefully limited wired connectivity through Cisco ISE.
Incorrect Answers
Separate employee, guest, and personally owned device onboarding through Cisco ISE identity and authorization policies matched to legitimate use. This response applies to Cisco ISE guest and BYOD identity policies, not the controlling requirement in this case. Guest access and BYOD onboarding are authorization workflows, not a grant of permanent trusted access merely because a device connects to Wi-Fi. For this scenario, the targeted action is: Use MAC Authentication Bypass only for supported non-802.1X devices with restricted roles and inventory-backed policy. Situation: A badge reader has no supplicant and requires carefully limited wired connectivity through Cisco ISE.
Configure network access device 802.1X to use Cisco ISE RADIUS decisions and verify supplicant, authenticator, and server roles. This response applies to 802.1X port-based access with Cisco ISE, not the controlling requirement in this case. In 802.1X the endpoint supplicant communicates through an authenticator to a back-end authentication server; access policy follows AAA results. For this scenario, the targeted action is: Use MAC Authentication Bypass only for supported non-802.1X devices with restricted roles and inventory-backed policy. Situation: A badge reader has no supplicant and requires carefully limited wired connectivity through Cisco ISE.
Identify suspicious DNS-based data movement using query entropy, length, volume, domain ownership, and endpoint context before containment. This response applies to DNS tunneling exfiltration detection, not the controlling requirement in this case. DNS is a name-resolution protocol but can carry encoded data in labels or answers; unusual queries require contextual analysis to avoid false positives. For this scenario, the targeted action is: Use MAC Authentication Bypass only for supported non-802.1X devices with restricted roles and inventory-backed policy. Situation: A badge reader has no supplicant and requires carefully limited wired connectivity through Cisco ISE.


