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.
Question 401 A network operator changes a RADIUS shared secret on the router but not on the server; authentication requests time out despite reachability. Which corrective action most directly resolves the documented failure without suppressing unrelated safeguards? 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. Apply the appropriate AAA accounting method list to the intended service or line and check server logging. Create and test a suitably privileged break-glass local account with an explicitly ordered fallback method list. ExplanationCorrect Answer A:Synchronize the RADIUS client/server secret and confirm correct source identity and UDP transport. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. Inspect server and router logs for authenticator errors and verify a successful test login. Other Answers B:Set the approved source interface or update server client definitions to match the actual request source. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. C:Apply the appropriate AAA accounting method list to the intended service or line and check server logging. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. D:Create and test a suitably privileged break-glass local account with an explicitly ordered fallback method list. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact.
Question 402 A network operator changes a RADIUS shared secret on the router but not on the server; authentication requests time out despite reachability. Which technical mechanism best explains the behavior observed in this scenario? 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. 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. ExplanationCorrect Answer B:A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. This explains why the initial condition produces the observed failure. The direct repair is: Synchronize the RADIUS client/server secret and confirm correct source identity and UDP transport. Validate through: Inspect server and router logs for authenticator errors and verify a successful test login. Other Answers A: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. C:AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. D:AAA named method lists affect only access lines or services to which they are actually applied. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact.
Question 403 A network operator changes a RADIUS shared secret on the router but not on the server; authentication requests time out despite reachability. 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. Verify matched login, logout and accounting session records for one controlled test administrator. Inspect server and router logs for authenticator errors and verify a successful test login. Test permitted `show` commands and rejected configuration commands with server authorization logs. ExplanationCorrect Answer C:Inspect server and router logs for authenticator errors and verify a successful test login. This checks the affected traffic or control-plane behavior, not merely a generic up/down indicator. The underlying mechanism is: A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. Other Answers A:Show server accounting records containing administrator identities and executed commands. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. B:Verify matched login, logout and accounting session records for one controlled test administrator. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. D:Test permitted `show` commands and rejected configuration commands with server authorization logs. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact.
Question 404 A network operator changes a RADIUS shared secret on the router but not on the server; authentication requests time out despite reachability. Which lasting design or operational safeguard best prevents this particular issue from recurring? Standardize stable AAA source-interface addresses and register them before cutover. 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. ExplanationCorrect Answer D:Rotate AAA secrets as coordinated server/client changes with rollback and verification. This addresses the recurring cause: A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. A targeted acceptance check is: Inspect server and router logs for authenticator errors and verify a successful test login. Other Answers A:Standardize stable AAA source-interface addresses and register them before cutover. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. B:Train operators on reject-versus-error behavior and test both conditions in AAA change plans. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. C:Align administrative AAA protocol choice to required command authorization and audit granularity. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact.
Question 405 An organization needs detailed per-command administrator audit records but a team selects RADIUS merely because it already authenticates wireless users. Which corrective action most directly resolves the documented failure without suppressing unrelated safeguards? Use a supported TACACS+ command-accounting design for granular device administration events. Attach an existing login authentication method list to VTY and verify its methods and server group. Apply the appropriate AAA accounting method list to the intended service or line and check server logging. Configure and verify command authorization for the appropriate privilege levels on the TACACS+ policy and device. ExplanationCorrect Answer A:Use a supported TACACS+ command-accounting design for granular device administration events. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support. Show server accounting records containing administrator identities and executed commands. Other Answers B:Attach an existing login authentication method list to VTY and verify its methods and server group. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support. C:Apply the appropriate AAA accounting method list to the intended service or line and check server logging. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support. D:Configure and verify command authorization for the appropriate privilege levels on the TACACS+ policy and device. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support.
Question 406 An organization needs detailed per-command administrator audit records but a team selects RADIUS merely because it already authenticates wireless users. Which technical mechanism best explains the behavior observed in this scenario? AAA named method lists affect only access lines or services to which they are actually applied. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support. Authentication success does not automatically generate configured accounting records without an accounting method in scope. AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. ExplanationCorrect Answer B:TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support. This explains why the initial condition produces the observed failure. The direct repair is: Use a supported TACACS+ command-accounting design for granular device administration events. Validate through: Show server accounting records containing administrator identities and executed commands. Other Answers A:AAA named method lists affect only access lines or services to which they are actually applied. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support. C:Authentication success does not automatically generate configured accounting records without an accounting method in scope. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support. D:AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support.
Question 407 An organization needs detailed per-command administrator audit records but a team selects RADIUS merely because it already authenticates wireless users. After applying the correction, which verification evidence most directly demonstrates that this issue is resolved? Verify matched login, logout and accounting session records for one controlled test administrator. Simulate remote AAA unavailability and confirm a controlled local login without bypassing normal authentication when servers work. Show server accounting records containing administrator identities and executed commands. Display VTY login configuration and successfully test an SSH login using that list. ExplanationCorrect Answer C:Show server accounting records containing administrator identities and executed commands. This checks the affected traffic or control-plane behavior, not merely a generic up/down indicator. The underlying mechanism is: TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support. Other Answers A:Verify matched login, logout and accounting session records for one controlled test administrator. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support. B:Simulate remote AAA unavailability and confirm a controlled local login without bypassing normal authentication when servers work. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support. D:Display VTY login configuration and successfully test an SSH login using that list. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support.
Question 408 An organization needs detailed per-command administrator audit records but a team selects RADIUS merely because it already authenticates wireless users. Which lasting design or operational safeguard best prevents this particular issue from recurring? Require accounting acceptance tests independently of authentication during access-control rollout. Maintain offline-tested emergency credentials and a documented AAA outage procedure. Standardize stable AAA source-interface addresses and register them before cutover. Align administrative AAA protocol choice to required command authorization and audit granularity. ExplanationCorrect Answer D:Align administrative AAA protocol choice to required command authorization and audit granularity. This addresses the recurring cause: TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support. A targeted acceptance check is: Show server accounting records containing administrator identities and executed commands. Other Answers A:Require accounting acceptance tests independently of authentication during access-control rollout. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support. B:Maintain offline-tested emergency credentials and a documented AAA outage procedure. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support. C:Standardize stable AAA source-interface addresses and register them before cutover. TACACS+ separates authentication, authorization and accounting for device administration, including command accounting support.
Question 409 A new VTY line explicitly references an AAA method list that is defined for console access only; SSH login fails despite a valid local user. Which corrective action most directly resolves the documented failure without suppressing unrelated safeguards? Attach an existing login authentication method list to VTY and verify its methods and server group. Configure the intended `aaa authorization exec` behavior and validate privilege assignment separately from authentication. Use a supported TACACS+ command-accounting design for granular device administration events. Correct the rejected credentials or policy instead of treating a negative server response as server unavailability. ExplanationCorrect Answer A:Attach an existing login authentication method list to VTY and verify its methods and server group. AAA named method lists affect only access lines or services to which they are actually applied. Display VTY login configuration and successfully test an SSH login using that list. Other Answers B:Configure the intended `aaa authorization exec` behavior and validate privilege assignment separately from authentication. AAA named method lists affect only access lines or services to which they are actually applied. C:Use a supported TACACS+ command-accounting design for granular device administration events. AAA named method lists affect only access lines or services to which they are actually applied. D:Correct the rejected credentials or policy instead of treating a negative server response as server unavailability. AAA named method lists affect only access lines or services to which they are actually applied.
Question 410 A new VTY line explicitly references an AAA method list that is defined for console access only; SSH login fails despite a valid local user. Which technical mechanism best explains the behavior observed in this scenario? AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. AAA named method lists affect only access lines or services to which they are actually applied. A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. AAA method-list fallback depends on configured methods and usable local credentials when the remote server is unavailable. ExplanationCorrect Answer B:AAA named method lists affect only access lines or services to which they are actually applied. This explains why the initial condition produces the observed failure. The direct repair is: Attach an existing login authentication method list to VTY and verify its methods and server group. Validate through: Display VTY login configuration and successfully test an SSH login using that list. Other Answers A:AAA commonly moves to the next method on error or no response, not after a valid explicit authentication rejection. AAA named method lists affect only access lines or services to which they are actually applied. C:A mismatched RADIUS shared secret prevents valid authentication exchange even when IP routing is intact. AAA named method lists affect only access lines or services to which they are actually applied. D: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.
