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Question 650
A building uses an EAP-TLS SSID but a device certificate was revoked and still authenticates. What should the team inspect to confirm the result?
- Verify deprecated insecure services are disabled and administrative sessions use secure protocols
- Check contract expiry, assigned role and denied internal destinations
- Attempt an authorized controlled test with the revoked identity and inspect rejection events
- Compare accepted legitimate ARP and rejected spoofed frames in violation logs
Explanation
Correct Answer
C:Actual rejection proves revocation enforcement works. A previously issued but revoked credential should not grant indefinite access.
Incorrect Answers
A:A documented policy is not proof the old listener is closed. In this situation, actual rejection proves revocation enforcement works.
B:Authorization should disappear when the contract ends. It would not resolve the documented symptom; actual rejection proves revocation enforcement works.
D:The control should distinguish authentic bindings from forged claims. By contrast, actual rejection proves revocation enforcement works.
Question 651
A building uses an EAP-TLS SSID but a device certificate was revoked and still authenticates. Which misconception is most likely to obstruct a correct fix?
- Trust all edge ports so no DHCP offers are ever blocked
- Assume 802.1X authentication automatically restricts every destination a client can reach
- Assume a certificate's future expiry date means revocation is irrelevant
- Treat every RADIUS timeout as permission to join the trusted clinical VLAN
Explanation
Correct Answer
C:Revocation can invalidate credentials before expiration. A previously issued but revoked credential should not grant indefinite access.
Incorrect Answers
A:That configuration lets a rogue server assign unsafe gateways. The relevant technical distinction is that revocation can invalidate credentials before expiration.
B:Authentication identifies the device or user but does not define every access rule. It would not resolve the documented symptom; revocation can invalidate credentials before expiration.
D:Availability fallback cannot override patient-data protection. By contrast, revocation can invalidate credentials before expiration.
Question 652
A building uses an EAP-TLS SSID but a device certificate was revoked and still authenticates. What precaution is most important before the change is expanded?
- Review role permissions with the information security owner before broad rollout
- Keep CRL or OCSP dependencies available and monitor their failures
- Validate thresholds for legitimate discovery and routing messages
- Define phone-and-PC multi-auth exceptions explicitly
Explanation
Correct Answer
B:Revocation infrastructure can become an availability dependency. Actual rejection proves revocation enforcement works.
Incorrect Answers
A:A broad authenticated role can still expose sensitive systems. By contrast, revocation infrastructure can become an availability dependency.
C:Overly strict controls can destabilize the network itself. Here, however, revocation infrastructure can become an availability dependency.
D:Legitimate shared-port designs should not become open forwarding paths. The relevant technical distinction is that revocation infrastructure can become an availability dependency.
Question 653
A contractor needs short-term access to a restricted maintenance VLAN over Wi-Fi. Which configuration decision most directly resolves the situation?
- Create an expiring contractor identity/role with only the needed segment access
- Evaluate stronger device identity such as certificate-based authentication and role mapping
- Apply the approved guest isolation and deny internal subnet access at the enforcement boundary
- Investigate rogue AP identity and use supported wireless detection and incident response
Explanation
Correct Answer
A:Time-bounded least privilege limits the exposure of external support. Authorization should disappear when the contract ends.
Incorrect Answers
B:MAC address alone is not proof of device ownership. In this situation, time-bounded least privilege limits the exposure of external support.
C:An SSID name alone is not a security policy. Here, however, time-bounded least privilege limits the exposure of external support.
D:Identical SSID text does not establish a trusted infrastructure device. The relevant technical distinction is that time-bounded least privilege limits the exposure of external support.
Question 654
A contractor needs short-term access to a restricted maintenance VLAN over Wi-Fi. Which check most directly demonstrates the desired network behavior?
- Check contract expiry, assigned role and denied internal destinations
- Inspect port authentication sessions and learned MACs after adding a test bridge
- Attempt an authorized controlled test with the revoked identity and inspect rejection events
- Inject a controlled rogue offer and verify it is rejected while legitimate leases succeed
Explanation
Correct Answer
A:Authorization should disappear when the contract ends. Time-bounded least privilege limits the exposure of external support.
Incorrect Answers
B:Session evidence reveals unauthorized additional devices. It would not resolve the documented symptom; authorization should disappear when the contract ends.
C:Actual rejection proves revocation enforcement works. In this situation, authorization should disappear when the contract ends.
D:Functionality and protection must both pass. Here, however, authorization should disappear when the contract ends.
Question 655
A contractor needs short-term access to a restricted maintenance VLAN over Wi-Fi. Which assumption would be most misleading when investigating this situation?
- Assume 802.1X authentication automatically restricts every destination a client can reach
- Share a permanent administrator credential to avoid provisioning an individual contractor identity
- Assume any radio using the corporate SSID is part of the approved WLAN
- Hide Telnet behind a nonstandard port while continuing to transmit passwords in cleartext
Explanation
Correct Answer
B:Shared privileged access defeats accountability and revocation. Time-bounded least privilege limits the exposure of external support.
Incorrect Answers
A:Authentication identifies the device or user but does not define every access rule. By contrast, shared privileged access defeats accountability and revocation.
C:SSID names are public and trivial to impersonate. It would not resolve the documented symptom; shared privileged access defeats accountability and revocation.
D:Changing a port does not encrypt traffic. In this situation, shared privileged access defeats accountability and revocation.
Question 656
A contractor needs short-term access to a restricted maintenance VLAN over Wi-Fi. Which safeguard best reduces the deployment risk in this case?
- Stage profile deployment and keep an authorized recovery enrollment path
- Require a named sponsor and emergency disable procedure
- Document key rotation, supported client transition and immediate incident response
- Keep the authorized DHCP relay/server paths documented and monitored
Explanation
Correct Answer
B:Contractor access should have a responsible owner. Authorization should disappear when the contract ends.
Incorrect Answers
A:Certificate migrations can lock out large fleets. The relevant technical distinction is that contractor access should have a responsible owner.
C:A hurried change must not leave critical devices offline. It would not resolve the documented symptom; contractor access should have a responsible owner.
D:Incorrect trust mapping can cause a general addressing outage. By contrast, contractor access should have a responsible owner.
Question 657
A site has a wireless intrusion alert for a neighbor's AP that uses a similar SSID but no wired connection to the company. What is the most appropriate first technical change?
- Apply the approved guest isolation and deny internal subnet access at the enforcement boundary
- Classify the detection using BSSID, RF and wired-network evidence before containment
- Verify certificate revocation checking and the approved RADIUS trust policy
- Deploy supported dynamic ARP inspection with a valid binding source
Explanation
Correct Answer
B:Neighbor networks can be visible without being unauthorized corporate equipment. Evidence prevents confusing co-location with actual infrastructure compromise.
Incorrect Answers
A:An SSID name alone is not a security policy. Here, however, neighbor networks can be visible without being unauthorized corporate equipment.
C:A previously issued but revoked credential should not grant indefinite access. By contrast, neighbor networks can be visible without being unauthorized corporate equipment.
D:Forged ARP frames can redirect local traffic without changing IP routes. The relevant technical distinction is that neighbor networks can be visible without being unauthorized corporate equipment.
Question 658
An access port must authenticate employees through ClearPass before assigning a department VLAN. What should the network engineer do to address this requirement?
- Configure 802.1X on the switch with RADIUS and the approved role or VLAN attributes
- Return a constrained guest role and apply the corresponding ACL or segment enforcement
- Correct the RADIUS policy precedence and group-to-role mapping
- Align the configured shared secret and server identity on both RADIUS client and server
Explanation
Correct Answer
A:Central identity decisions can determine the client's authorized network segment. A successful exchange is insufficient if the returned role is wrong.
Incorrect Answers
B:Authorization defines service reachability beyond mere connection success. The relevant technical distinction is that central identity decisions can determine the client's authorized network segment.
C:Authorization rules can select the wrong role even with valid identity. In this situation, central identity decisions can determine the client's authorized network segment.
D:Mismatched authentication parameters can cause request rejection or silence. Here, however, central identity decisions can determine the client's authorized network segment.
Question 659
An access port must authenticate employees through ClearPass before assigning a department VLAN. What should the team inspect to confirm the result?
- Measure first-login time and observe RADIUS requests during primary loss
- Inspect the RADIUS accept response and effective port VLAN/role on a test employee
- Inspect a permitted and denied administrator command/session along with AAA logs
- Check supplicant and RADIUS handshake errors against the full new chain
Explanation
Correct Answer
B:A successful exchange is insufficient if the returned role is wrong. Central identity decisions can determine the client's authorized network segment.
Incorrect Answers
A:Response-time evidence reveals excessive wait or broken fallback. In this situation, a successful exchange is insufficient if the returned role is wrong.
C:Login success alone does not prove command authorization. Here, however, a successful exchange is insufficient if the returned role is wrong.
D:Evidence pinpoints whether client or server trust is missing. It would not resolve the documented symptom; a successful exchange is insufficient if the returned role is wrong.
Question 660
An access port must authenticate employees through ClearPass before assigning a department VLAN. Which misconception is most likely to obstruct a correct fix?
- Give every network engineer unrestricted local super-user credentials instead of mapped roles
- Disable 802.1X globally instead of correcting the RADIUS trust relationship
- Assign all authenticated devices to one unrestricted VLAN without checking returned authorization
- Assume identical username text always produces an identical role without policy configuration
Explanation
Correct Answer
C:Authentication does not automatically mean equal network privileges. Central identity decisions can determine the client's authorized network segment.
Incorrect Answers
A:Shared broad access defeats least privilege and audit ownership. It would not resolve the documented symptom; authentication does not automatically mean equal network privileges.
B:Broad bypass trades an administrative error for widespread exposure. By contrast, authentication does not automatically mean equal network privileges.
D:Service type and NAS attributes can affect authorization rules. In this situation, authentication does not automatically mean equal network privileges.
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