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Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: A QKView is a comprehensive snapshot of the device's Control Plane state, configuration, and logs used for troubleshooting. By default, the qkview utility stores its generated output file in the /var/tmp/ directory. Administrators must know this path to retrieve the file for upload to F5 iHealth or Support.

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

When restoring aUCS file to replacement hardware (RMA device), thelicense from the original device is not validon the new system. If the UCS restore attempts to load the old license, BIG-IP reports license errors such as“License is not operational”, which can prevent traffic objects (including pools and virtual servers) from loading correctly.

To avoid this issue, F5 documentation recommends restoring the UCSwithout the license, using the following command:

tmsh load /sys ucs no-license

This approach:

Restores all configuration objects (LTM, networking, certificates, keys, etc.)

Excludes the invalid license tied to the old hardware

Allows the administrator toactivate a new license separatelyon the replacement device

Why the other options are incorrect:

A. Remove the license information from the UCS archiveNot supported or recommended; UCS files should not be manually modified.

B. Revoke the license prior to restoringLicense revocation does not prevent the UCS from attempting to load license data.

D. Reactivate the license on the new device using the manual activation methodThis must be doneafterrestoring the UCS and does not prevent the restore failure itself.

Therefore, the correct and supported method to avoid this error isC.

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Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:Managing the state of a device often involves restoring configuration backups known as User Configuration Set (UCS) files These archives contain the full system configuration, including licenses and SSL certificates. The Control Plane provides a dedicated management area for these files under System > Archives, where administrators can upload, create, and restore configuration snapshots

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 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:

On BIG-IP systems, SSH access restrictions are configured under the/sys sshdobject. Theallowproperty defines theIP addresses or networks permitted to connect to the management interface using SSH.

Thelistcommand is used to display the current configuration settings.

Therefore, tmsh list /sys sshd allow correctly displays the configured allowed IP ranges.

Why the other options are incorrect:

A (show)displays runtime or statistical information, not configuration values.

C and Dincorrectly reference /etc/hosts.allow; BIG-IP manages SSH access through TMSH objects, not by directly listing host files in this context.

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

Theaudit log(/var/log/audit) recordsconfiguration changesmade on the BIG-IP system, including:

Whomade the change (user account)

Whatwas changed (for example, a virtual server modification)

Whenthe change occurred

Howit was performed (GUI, TMSH, or API)

Why the other options are incorrect:

/var/log/securelogs authentication events such as login successes and failures, not configuration changes.

/var/log/ltmlogs traffic-management and runtime LTM events, not administrative configuration modifications.

Therefore, the correct log file for trackingwho changed a virtual serveris/var/log/audit.

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: F5 architecture distinguishes between the Data Plane (TMM processing application traffic) and the Control Plane (Linux host processing management tasks). High Control Plane CPU utilization typically points to administrative activities such as heavy GUI usage, complex API calls (iControl), large-scale configuration synchronizations, or intensive logging/monitoring tasks rather than the actual switching or load balancing of application data.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: The "Management Port" is distinct from TMM data ports. Configuration for global platform-level settings, including administrative access restrictions (IP Allow lists for SSH and HTTPS) for the management port, is found under System > Platform. This is a critical Control Plane hardening step to prevent unauthorized remote access

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