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That diagnosis is supported by a different symptom: Remote administration fails whenever the first configured TACACS+ server is unavailable. Here the recorded observation is: the rejected engineer remains denied despite valid local credentials configured on the router. The applicable cause is: an authoritative TACACS+ rejection is not the same condition as server unavailability.

That diagnosis is supported by a different symptom: All router administration fails when the TACACS+ server becomes unreachable. Here the recorded observation is: the rejected engineer remains denied despite valid local credentials configured on the router. The applicable cause is: an authoritative TACACS+ rejection is not the same condition as server unavailability.

That diagnosis is supported by a different symptom: A viewer who authenticated with TACACS+ can configure router interfaces. Here the recorded observation is: the rejected engineer remains denied despite valid local credentials configured on the router. The applicable cause is: an authoritative TACACS+ rejection is not the same condition as server unavailability.

That control reduces a separate risk: The AAA server group lacks a usable secondary or uses the wrong server group reference. For the described design, the recurring risk arises from: an authoritative TACACS+ rejection is not the same condition as server unavailability. The specific required safeguard is: validate emergency fallback without creating a bypass for deliberate centralized denies.

That control reduces a separate risk: Only authentication was centralized; privileged command authorization was not enforced. For the described design, the recurring risk arises from: an authoritative TACACS+ rejection is not the same condition as server unavailability. The specific required safeguard is: validate emergency fallback without creating a bypass for deliberate centralized denies.

That control reduces a separate risk: The AAA method list provides no valid local fallback for AAA server errors. For the described design, the recurring risk arises from: an authoritative TACACS+ rejection is not the same condition as server unavailability. The specific required safeguard is: validate emergency fallback without creating a bypass for deliberate centralized denies.

Using a suitable TACACS+ device-administration integration when granular command authorization is required would not attach the correct AAA login method list to VTY lines as well as the intended console scope.

Enabling AAA command accounting to an appropriate TACACS+ server with required privilege levels would not attach the correct AAA login method list to VTY lines as well as the intended console scope.

Configuring a supported AAA server group with reachable primary and secondary TACACS+ server definitions would not attach the correct AAA login method list to VTY lines as well as the intended console scope.

This test measures a different behavior: Test a low-privilege administrative login and verify denied commands are enforced at the device. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect each line's method-list binding and verify SSH login uses the centralized identity.

This test measures a different behavior: Disable the primary in a lab and confirm the device authenticates against the secondary server. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect each line's method-list binding and verify SSH login uses the centralized identity.

This test measures a different behavior: Simulate server unreachability and verify local break-glass login; then test explicit TACACS+ reject behavior. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect each line's method-list binding and verify SSH login uses the centralized identity.

That diagnosis is supported by a different symptom: An administrative user receives broad CLI access because the RADIUS design lacks the intended command-by-command policy. Here the recorded observation is: remote SSH ignores TACACS+ authentication while console login correctly uses it. The applicable cause is: the named method list was not bound to the VTY line configuration.

That diagnosis is supported by a different symptom: Remote administration fails whenever the first configured TACACS+ server is unavailable. Here the recorded observation is: remote SSH ignores TACACS+ authentication while console login correctly uses it. The applicable cause is: the named method list was not bound to the VTY line configuration.

That diagnosis is supported by a different symptom: All router administration fails when the TACACS+ server becomes unreachable. Here the recorded observation is: remote SSH ignores TACACS+ authentication while console login correctly uses it. The applicable cause is: the named method list was not bound to the VTY line configuration.

That control reduces a separate risk: The AAA method list provides no valid local fallback for AAA server errors. For the described design, the recurring risk arises from: the named method list was not bound to the VTY line configuration. The specific required safeguard is: review all line and management transport types when deploying AAA templates.

That control reduces a separate risk: RADIUS network-access AAA was conflated with TACACS+ granular device-command authorization. For the described design, the recurring risk arises from: the named method list was not bound to the VTY line configuration. The specific required safeguard is: review all line and management transport types when deploying AAA templates.

That control reduces a separate risk: The AAA server group lacks a usable secondary or uses the wrong server group reference. For the described design, the recurring risk arises from: the named method list was not bound to the VTY line configuration. The specific required safeguard is: review all line and management transport types when deploying AAA templates.

Specifying supported AAA source-interface/VRF settings so requests use a reachable address with registered client policy would not configure a supported AAA server group with reachable primary and secondary TACACS+ server definitions.

Creating an AAA login method list with TACACS+ first and local fallback for server error cases would not configure a supported AAA server group with reachable primary and secondary TACACS+ server definitions.

Enabling supported AAA exec and command authorization through TACACS+ policy with appropriate emergency fallback would not configure a supported AAA server group with reachable primary and secondary TACACS+ server definitions.

This test measures a different behavior: Simulate server unreachability and verify local break-glass login; then test explicit TACACS+ reject behavior. It does not establish the target outcome. For the documented fault, the direct acceptance test is: disable the primary in a lab and confirm the device authenticates against the secondary server.

This test measures a different behavior: Capture AAA packet source address and confirm responses return to the intended VRF interface. It does not establish the target outcome. For the documented fault, the direct acceptance test is: disable the primary in a lab and confirm the device authenticates against the secondary server.

This test measures a different behavior: Run an allowed show command and a forbidden configuration command for a limited operator; inspect server authorization logs. It does not establish the target outcome. For the documented fault, the direct acceptance test is: disable the primary in a lab and confirm the device authenticates against the secondary server.

That diagnosis is supported by a different symptom: TACACS+ requests leave an unregistered data interface and the server silently rejects or ignores them. Here the recorded observation is: remote administration fails whenever the first configured TACACS+ server is unavailable. The applicable cause is: the AAA server group lacks a usable secondary or uses the wrong server group reference.

That diagnosis is supported by a different symptom: All router administration fails when the TACACS+ server becomes unreachable. Here the recorded observation is: remote administration fails whenever the first configured TACACS+ server is unavailable. The applicable cause is: the AAA server group lacks a usable secondary or uses the wrong server group reference.

That diagnosis is supported by a different symptom: A viewer who authenticated with TACACS+ can configure router interfaces. Here the recorded observation is: remote administration fails whenever the first configured TACACS+ server is unavailable. The applicable cause is: the AAA server group lacks a usable secondary or uses the wrong server group reference.

That control reduces a separate risk: AAA transport source or VRF context does not match the server's known-client configuration. For the described design, the recurring risk arises from: the AAA server group lacks a usable secondary or uses the wrong server group reference. The specific required safeguard is: check failover order and independent server-path reachability at each site.

That control reduces a separate risk: The AAA method list provides no valid local fallback for AAA server errors. For the described design, the recurring risk arises from: the AAA server group lacks a usable secondary or uses the wrong server group reference. The specific required safeguard is: check failover order and independent server-path reachability at each site.

That control reduces a separate risk: Only authentication was centralized; privileged command authorization was not enforced. For the described design, the recurring risk arises from: the AAA server group lacks a usable secondary or uses the wrong server group reference. The specific required safeguard is: check failover order and independent server-path reachability at each site.

Enabling AAA command accounting to an appropriate TACACS+ server with required privilege levels would not specify supported AAA source-interface/VRF settings so requests use a reachable address with registered client policy.

Configuring a supported AAA server group with reachable primary and secondary TACACS+ server definitions would not specify supported AAA source-interface/VRF settings so requests use a reachable address with registered client policy.

Enabling supported AAA exec and command authorization through TACACS+ policy with appropriate emergency fallback would not specify supported AAA source-interface/VRF settings so requests use a reachable address with registered client policy.