Pass the F5-CA F5CAB4 Questions and answers with ExamsMirror

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

Therecommended and supportedmethod for creating BIG-IP users from the CLI is throughTMSH, using the authentication subsystem.

tmsh create auth user prompt-for-password:

Properly creates the user within BIG-IP’sAAA/authentication framework

Encrypts the password securely

Ensures the user is stored and managed correctly in the BIG-IP configuration database

Is fully supported and documented

Why the other options are incorrect:

Bis unsafe and unsupported because editing bigip.conf directly and storing clear-text passwords violates security and configuration management best practices.

C(f5adduser / f5passwd) isdeprecatedand not recommended for modern BIG-IP versions.

Dcreates aLinux system user only, not a BIG-IP administrative user, and will not allow access to the Configuration Utility or TMSH roles.

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

On BIG-IP systems,Local Traffic Manager (LTM)is responsible for:

Pool and pool member management

Health monitor execution

Marking pool membersUP or DOWNbased on monitor results

Events related tohealth monitor status changes, including when pool members transition betweenUPandDOWN, are logged in/var/log/ltm.

Why the other options are incorrect:

/var/log/auditrecords administrative configuration changes, not runtime health status.

/var/log/securelogs authentication and authorization events.

/var/log/monitorsis not a standard BIG-IP log file.

Therefore, the correct log file for pool member health monitor status events is/var/log/ltm.

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

Reactivating a BIG-IP license is atraffic-disruptive operation. During the license reactivation process, the BIG-IP system performs aconfiguration reload, which results in atemporary interruption of all traffic processing. Because traffic handling is affected, F5 explicitly recommends scheduling license updates during amaintenance window.

This behavior is documented in F5 Knowledge Base articles, which state thatlicense reactivation impacts trafficand must be planned accordingly during upgrades or system changes.

The other options are not considered disruptive:

Creating aQKViewis primarily a diagnostic task and does not interrupt traffic.

Runningtmsh save sys configonly saves the running configuration to disk.

Generating aUCSis resource-intensive but doesnotreload configuration or interrupt traffic processing.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: The BIG-IP Control Plane monitors the "Commit ID" of the configuration on all group members. When a change is made on the Standby unit, it becomes the member with the most recent configuration. The "Recommended Action" in the HA status dashboard will be to synchronize that specific device's configuration to the rest of the group to ensure consistency

Comprehensive and Detailed Exp11lanation From BIG-IP Administration Control Plane Administration documents: Monitoring specific object health is a core function of the Control Plane. While the dashbo12ard provides a global overview, granular per13formance data—such as the CPU overhead a specific Virtual Server is placing on the Traffic Management Microkernel (TMM)—is found under the Module Statistics. Navigating to Statistics > Module Statistics > Local Traffic > Virtual Servers allows an administrator to report on the current status and resource consumption of individual traffic objects.

In a BIG-IP Device Service Cluster (DSC), manual configuration synchronization is performed using the ConfigSync framework. 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 a one-time manual ConfigSync

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

Is commonly used when auto-sync is disabled or when the administrator wants explicit control over synchronization timing

Why the other options are incorrect:

A is not a valid TMSH command for ConfigSync.

B enables auto-sync but does not perform an immediate synchronization.

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

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

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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

In the BIG-IP Configuration Utility, status icons provide immediate health information. A red diamond specifically indicates that the object itself is administratively disabled. When a virtual server is disabled, BIG-IP will not accept or process traffic for that virtual server, regardless of pool or node state.

If all pool members were down, the virtual server would typically show a yellow triangle (available but no resources).

If all pool members were disabled, the virtual server would usually still be enabled but unavailable due to pool status, not shown as a red diamond.

Protocol mismatch (HTTPS sent to HTTP) does not change the administrative status icon of the virtual server.

Therefore, the red diamond clearly indicates the virtual server is disabled, making D the correct answer.

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

Here is the next batch of 10 questions from your document that are 100% related to BIG-IP

On BIG-IP systems, Local Traffic Manager (LTM) is responsible for:

Pool and pool member management

Health monitor execution

Marking pool members UP or DOWN based on monitor results

Events related to health monitor status changes, including when pool members transition between UP and DOWN, are logged in /var/log/ltm.

Why the other options are incorrect:

/var/log/audit records administrative configuration changes, not runtime health status.

/var/log/secure logs authentication and authorization events.

/var/log/monitors is not a standard BIG-IP log file.

Therefore, the correct log file for pool member health monitor status events is /var/log/ltm.

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