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Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:

BIG-IP supportsremote authenticationby integrating with centralized authentication services through its AAA framework. Thesupported and commonly used remote authentication serversinclude:

LDAP (A)Used to authenticate users against directory services such as Active Directory or other LDAP-compliant directories.

RADIUS (C)Commonly used for centralized authentication, authorization, and accounting, especially in network and security environments.

Why the other options are incorrect:

OAUTH (B)is an authorization framework, not supported as a direct administrative authentication backend for BIG-IP management access.

SAML (D)is primarily used forsingle sign-on (SSO)in application authentication scenarios, not for BIG-IP administrative login authentication.

Thus, the correct remote authentication server types areLDAP and RADIUS.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: Although /var/log/ltm is primarily associated with Local Traffic Manager events, it is also the primary destination for system-level alerts generated by the Control Plane's chmand (Chassis Manager Daemon). Hardware status changes, including power supply failures, fan speeds, and temperature warnings, are logged as "notice" or "critical" events within the LTM log file.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:Reporting device status includes monitoring physical resource exhaustion, such as memory48. The Control Plane provides both a command-line method via TMSH (show /sys memory) and a graphical method under Statistics > Module Statistics > Memory to report on how memory is allocated across TMM and the Linux host494949494949494949. This is essential for identifying potential "Aggressive Mode" triggers or hardware performance bottlenecks50.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:To re27port the current status of high availability for specific traffic, an administrator must verify the Traffic Group association28. In the Configuration Utility, Virtual Server properties include the Virtual Address settings where the 'Traffic Group' is assigned29292929. If the Virtual Address is assigned to a floating traffic group (like traffic-group-1), it is configured to fail over to the standby member30303030.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:This log message indicates that the system is low on memory and has activated 'Aggressive Mode' to reclaim resources by closing old connections37. In an HA environment, one way to ensure state stability during memory pressure is to manage how connection data is handled38. While the document suggests D, procedural mitigation for 'Aggressive Mode' often involves reviewing resource provisioning or optimizing connection idle timeouts to reduce memory footprint39.

Comprehensive and Detailed Explanation From BIG-IP A34dministration Control Plane Administration documents: Authentication and authorization events are handled by the system's PAM (Pluggable Authentication Modules). For Control Plane security auditing, all login attempts—whether local or remote (LDAP/RADIUS/TACACS+)—and SSH-related security events are recorded in /var/log/secure. This is the primary log for troubleshooting administrative access issues

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:Management connectivity is protected by an allowed access list for the httpd daemon. Unlike TMM data ports which use 'Port Lockdown' settings, the management port's access is controlled by a specific 'Allow' list323232. If an administrator's IP is not explicitly included in this list, the Control Plane will reject HTTPS connection attempts to the management utility33.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:

A BIG-IPdevice group cannot be deleted if it still contains device members, even if one of those devices has already been decommissioned or is unreachable. Before deleting the device group, the administrator mustexplicitly remove the decommissioned device from the device group configuration.

Once the removed or unreachable device is deleted from the device group membership, the BIG-IP system allows the remaining administrator to successfully delete the device group.

Why the other options are incorrect:

A. Remove all members from the device groupThis is not required; the key requirement is removing thedecommissioned device, not all members.

B. Make sure all members are in syncSynchronization status does not prevent device group deletion.

D. Disable the device groupDevice groups cannot be disabled; they must be modified or deleted.

Therefore, the correct prerequisite action is toremove the decommissioned device from the device group, makingCthe correct answer.

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Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration do38cuments: While HA state is managed under "Device Management," the specific failover behavior of a traffic object is linked to its configuration. A Virtual Address must be associated with a "Traffic Group" (usually traffic-group-1) to fail over. This association and the resulting floating status can be verified by viewing the Virtual Server or Virtual Address list under Local Traffic > Virtual Servers.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:Identifying the current device status includes knowing which software modules (such as LTM, ASM, or APM) are active and how much hardware resource (CPU/Memory) is allocated to them40404040. The System > Resource Provisioning screen displays the licensing status and allows the administrator to set the provisioning level (Nominal, Dedicated, or Minimum) for each module.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: In a High Availability pair, the "Force to Standby" action is a Control Plane command used to trigger a manual failover. This option is only logical and available on the device that is currently in the Active state. If the button is greyed out, it indicates that the administrator is already logged into the Standby unit, which has no active traffic groups to relinquish.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:

On BIG-IP systems,authentication and authorization eventsare logged in/var/log/secure. This includes:

Successful and failedSSH login attempts

Invalid user authentication attempts

PAM (Pluggable Authentication Module) authentication failures

Access denials related to secure services

Why the other options are incorrect:

/var/log/messagescontains general system messages and service events, not detailed authentication failures.

/var/log/auditrecords administrative configuration changes (who changed what and when), not login attempts.

/var/log/ltmlogs traffic-management (TMM) and application-related events.

Therefore, the correct log file for investigatingunauthorized SSH login attemptsis/var/log/secure.

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Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:

On BIG-IP systems that participate in a Device Service Cluster (DSC), each device compares theremote device’ssystem time to itsownsystem time. If the difference is outside theConfigSync time threshold(commonly referenced as3 seconds by default), BIG-IP updates the shell prompt to show“Peer Time Out of Sync”, andConfigSync operations may failuntil time is corrected (typically by fixing NTP reachability/configuration, or in some cases adjusting the threshold). (cdn.studio.f5.com)

This message is specifically abouttime drift between peersin the trust domain/DSC—not basic reachability (soBis not what it means), and it doesnotprove which side is “correct” (soCis too specific). It also doesn’t directly mean an NTP source is “skewed” (A can be acause, but the prompt message itself indicates thepeer-to-peer time mismatchcondition). (cdn.studio.f5.com)

Comprehensive and Detailed Explanation From BIG-IP Administration Con10trol Plane Administration documents:Placing a device in the FORCED_OFFLINE state is a critical procedural concept for HA maintenance111213.1415Unlike simply being 'Standby16', the FORCED_OFFLINE state ensures tha17t the Control Plane will not participate in failover selection, effectively preventing the device from becoming 'Active' even if the peer fails18. This state also allows the administrator to terminate existing connections to ensure no traffic is being processed during the maintenance window19.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:

In a BIG-IPDevice Service Cluster (DSC), manual configuration synchronization is performed using theConfigSyncframework. The supported and documented command to manually push the local configuration to a specific device group is:

tmsh run cm config-sync to-group

This command:

Initiates aone-time manual ConfigSync

Pushes the local device’s configuration to all members of the specified device group

Is commonly used whenauto-sync is disabledor when the administrator wants explicit control over synchronization timing

Why the other options are incorrect:

Ais not a valid TMSH command for ConfigSync.

Benables auto-sync but doesnotperform an immediate synchronization.

Dis not a valid or supported TMSH command for device group configuration synchronization.

Therefore, the correct command to manually synchronize configuration to a device group isC.

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