Question 390 A router's VTY authentication method list tries a TACACS+ group before local users; during a TACACS+ outage administrators cannot log in because the local username was never provisioned. Which technical mechanism best explains the behavior observed in this scenario? AAA authentication and EXEC authorization are distinct decisions; a successful login need not imply the desired session privilege. AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. AAA named method lists affect only access lines or services to which they are actually applied. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. ExplanationCorrect Answer B:AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. This explains why the initial condition produces the observed failure. The direct repair is: Create and test a suitably privileged break-glass local account with an explicitly ordered fallback method list. Validate through: Simulate remote AAA unavailability and confirm a controlled local login without bypassing normal authentication when servers work. Other Answers A:AAA authentication and EXEC authorization are distinct decisions; a successful login need not imply the desired session privilege. AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. C:AAA named method lists affect only access lines or services to which they are actually applied. AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. D:Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable.
Question 391 A router's VTY authentication method list tries a TACACS+ group before local users; during a TACACS+ outage administrators cannot log in because the local username was never provisioned. After applying the correction, which verification evidence most directly demonstrates that this issue is resolved? Show server accounting records containing administrator identities and executed commands. Compare authenticated identity with EXEC privilege and authorization traces on test accounts. Simulate remote AAA unavailability and confirm a controlled local login without bypassing normal authentication when servers work. Display VTY login configuration and successfully test an SSH login using that list. ExplanationCorrect Answer C:Simulate remote AAA unavailability and confirm a controlled local login without bypassing normal authentication when servers work. This checks the affected traffic or control-plane behavior, not merely a generic up/down indicator. The underlying mechanism is: AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. Other Answers A:Show server accounting records containing administrator identities and executed commands. AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. B:Compare authenticated identity with EXEC privilege and authorization traces on test accounts. AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. D:Display VTY login configuration and successfully test an SSH login using that list. AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable.
Question 392 A router's VTY authentication method list tries a TACACS+ group before local users; during a TACACS+ outage administrators cannot log in because the local username was never provisioned. Which lasting design or operational safeguard best prevents this particular issue from recurring? Define authentication, authorization and accounting as distinct requirements in device templates. Use least-privilege command sets and periodic privilege tests for administrative identities. Require accounting acceptance tests independently of authentication during access-control rollout. Maintain offline-tested emergency credentials and a documented AAA outage procedure. ExplanationCorrect Answer D:Maintain offline-tested emergency credentials and a documented AAA outage procedure. This addresses the recurring cause: AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. A targeted acceptance check is: Simulate remote AAA unavailability and confirm a controlled local login without bypassing normal authentication when servers work. Other Answers A:Define authentication, authorization and accounting as distinct requirements in device templates. AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. B:Use least-privilege command sets and periodic privilege tests for administrative identities. AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. C:Require accounting acceptance tests independently of authentication during access-control rollout. AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable.
Question 393 A technician expects a local account to override a deliberate RADIUS Access-Reject, but Cisco AAA does not try local authentication after a credential rejection. Which corrective action most directly resolves the documented failure without suppressing unrelated safeguards? Correct the rejected credentials or policy instead of treating a negative server response as server unavailability. Attach an existing login authentication method list to VTY and verify its methods and server group. Configure and verify command authorization for the appropriate privilege levels on the TACACS+ policy and device. Apply the appropriate AAA accounting method list to the intended service or line and check server logging. ExplanationCorrect Answer A:Correct the rejected credentials or policy instead of treating a negative server response as server unavailability. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. Inspect AAA debug outcomes and prove that reject and timeout follow different configured method-list paths. Other Answers B:Attach an existing login authentication method list to VTY and verify its methods and server group. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. C:Configure and verify command authorization for the appropriate privilege levels on the TACACS+ policy and device. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. D:Apply the appropriate AAA accounting method list to the intended service or line and check server logging. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection.
Question 394 A technician expects a local account to override a deliberate RADIUS Access-Reject, but Cisco AAA does not try local authentication after a credential rejection. Which technical mechanism best explains the behavior observed in this scenario? AAA authentication and EXEC authorization are distinct decisions; a successful login need not imply the desired session privilege. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. ExplanationCorrect Answer B:AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. This explains why the initial condition produces the observed failure. The direct repair is: Correct the rejected credentials or policy instead of treating a negative server response as server unavailability. Validate through: Inspect AAA debug outcomes and prove that reject and timeout follow different configured method-list paths. Other Answers A:AAA authentication and EXEC authorization are distinct decisions; a successful login need not imply the desired session privilege. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. C:Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. D:A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection.
Question 395 A technician expects a local account to override a deliberate RADIUS Access-Reject, but Cisco AAA does not try local authentication after a credential rejection. After applying the correction, which verification evidence most directly demonstrates that this issue is resolved? Compare authenticated identity with EXEC privilege and authorization traces on test accounts. Verify matched login, logout and accounting session records for one controlled test administrator. Inspect AAA debug outcomes and prove that reject and timeout follow different configured method-list paths. Capture request source IP and confirm the server recognizes it and returns valid responses. ExplanationCorrect Answer C:Inspect AAA debug outcomes and prove that reject and timeout follow different configured method-list paths. This checks the affected traffic or control-plane behavior, not merely a generic up/down indicator. The underlying mechanism is: AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. Other Answers A:Compare authenticated identity with EXEC privilege and authorization traces on test accounts. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. B:Verify matched login, logout and accounting session records for one controlled test administrator. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. D:Capture request source IP and confirm the server recognizes it and returns valid responses. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection.
Question 396 A technician expects a local account to override a deliberate RADIUS Access-Reject, but Cisco AAA does not try local authentication after a credential rejection. Which lasting design or operational safeguard best prevents this particular issue from recurring? Use least-privilege command sets and periodic privilege tests for administrative identities. Require accounting acceptance tests independently of authentication during access-control rollout. Maintain offline-tested emergency credentials and a documented AAA outage procedure. Train operators on reject-versus-error behavior and test both conditions in AAA change plans. ExplanationCorrect Answer D:Train operators on reject-versus-error behavior and test both conditions in AAA change plans. This addresses the recurring cause: AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. A targeted acceptance check is: Inspect AAA debug outcomes and prove that reject and timeout follow different configured method-list paths. Other Answers A:Use least-privilege command sets and periodic privilege tests for administrative identities. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. B:Require accounting acceptance tests independently of authentication during access-control rollout. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. C:Maintain offline-tested emergency credentials and a documented AAA outage procedure. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection.
Question 397 A router accepts TACACS+ login but users can run privileged configuration commands that their role should prohibit. Which corrective action most directly resolves the documented failure without suppressing unrelated safeguards? Configure and verify command authorization for the appropriate privilege levels on the TACACS+ policy and device. Synchronize the RADIUS client/server secret and confirm correct source identity and UDP transport. Set the approved source interface or update server client definitions to match the actual request source. Attach an existing login authentication method list to VTY and verify its methods and server group. ExplanationCorrect Answer A:Configure and verify command authorization for the appropriate privilege levels on the TACACS+ policy and device. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. Test permitted `show` commands and rejected configuration commands with server authorization logs. Other Answers B:Synchronize the RADIUS client/server secret and confirm correct source identity and UDP transport. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. C:Set the approved source interface or update server client definitions to match the actual request source. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. D:Attach an existing login authentication method list to VTY and verify its methods and server group. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted.
Question 398 A router accepts TACACS+ login but users can run privileged configuration commands that their role should prohibit. Which technical mechanism best explains the behavior observed in this scenario? AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. AAA authentication and EXEC authorization are distinct decisions; a successful login need not imply the desired session privilege. ExplanationCorrect Answer B:Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. This explains why the initial condition produces the observed failure. The direct repair is: Configure and verify command authorization for the appropriate privilege levels on the TACACS+ policy and device. Validate through: Test permitted `show` commands and rejected configuration commands with server authorization logs. Other Answers A:AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. C:AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. D:AAA authentication and EXEC authorization are distinct decisions; a successful login need not imply the desired session privilege. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted.
Question 399 A router accepts TACACS+ login but users can run privileged configuration commands that their role should prohibit. After applying the correction, which verification evidence most directly demonstrates that this issue is resolved? Compare authenticated identity with EXEC privilege and authorization traces on test accounts. Show server accounting records containing administrator identities and executed commands. Test permitted `show` commands and rejected configuration commands with server authorization logs. Display VTY login configuration and successfully test an SSH login using that list. ExplanationCorrect Answer C:Test permitted `show` commands and rejected configuration commands with server authorization logs. This checks the affected traffic or control-plane behavior, not merely a generic up/down indicator. The underlying mechanism is: Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. Other Answers A:Compare authenticated identity with EXEC privilege and authorization traces on test accounts. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. B:Show server accounting records containing administrator identities and executed commands. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. D:Display VTY login configuration and successfully test an SSH login using that list. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted.
Question 400 A router accepts TACACS+ login but users can run privileged configuration commands that their role should prohibit. Which lasting design or operational safeguard best prevents this particular issue from recurring? Train operators on reject-versus-error behavior and test both conditions in AAA change plans. Align administrative AAA protocol choice to required command authorization and audit granularity. Rotate AAA secrets as coordinated server/client changes with rollback and verification. Use least-privilege command sets and periodic privilege tests for administrative identities. ExplanationCorrect Answer D:Use least-privilege command sets and periodic privilege tests for administrative identities. This addresses the recurring cause: Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. A targeted acceptance check is: Test permitted `show` commands and rejected configuration commands with server authorization logs. Other Answers A:Train operators on reject-versus-error behavior and test both conditions in AAA change plans. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. B:Align administrative AAA protocol choice to required command authorization and audit granularity. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted. C:Rotate AAA secrets as coordinated server/client changes with rollback and verification. Authentication verifies identity, whereas TACACS+ authorization can decide whether a requested CLI command is permitted.
