Pass the F5-CA F5CAB4 Questions and answers with Dumpstech

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

On BIG-IP systems,all authentication attemptsfor administrative access—including logins to theConfiguration Utility (GUI)—are logged in/var/log/secure. This log file records:

Successful and failed login attempts

The username used

The authentication method (local, LDAP, RADIUS, etc.)

Access denials and PAM authentication errors

Why the other options are incorrect:

/var/log/pam/tallylogtracks account lockouts and failed attempt counters, not detailed login attempts.

/var/log/ltmlogs traffic management events, not administrative authentication.

/var/log/httpdlogs web server activity but does not record authentication success or failure for BIG-IP administrative users.

Therefore, the correct log file to verify whether a user attempted to log in to the BIG-IP Configuration Utility is/var/log/secure.

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

watch-devicegroup-device shows (among other columns) thecommit ID(cid.id / shown here as clu_id), theoriginating devicefor that commit (cid-orig / shown here as cl_orig), and thetime the configuration change was made(cid.time / shown here as cl_time). Thehighest/newest commitID and its timerepresent the most recent configuration change seen among the devices. (clouddocs.f5.com)

bigip_a has the latest configuration (A)because it shows commit ID3273at14:27:00, which is newer than commit ID1745at13:52:34on bigip_b and bigip_c. (clouddocs.f5.com)

Two devices are out of date (B)becausebigip_b and bigip_care still on the older commit ID1745, so they do not match the latest commit shown on bigip_a. (clouddocs.f5.com)

Why the other options are not supported by this output:

C is not supported: bigip_c is not showing a newer commit than the others; it’s on the older commit (1745), so it’s not the source of the most recent change. The output’s cid-orig column is what tells you where the change was made. (clouddocs.f5.com)

D/E are incorrect logic: matching cid.time between two devices only indicates they share the samechange timestamp/commit, not that it is thecorrectorlatestconfiguration. The “latest” is indicated by the newest commit ID/time (here, bigip_a). (clouddocs.f5.com)

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:

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:

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 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.

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:

To determine the current failover (HA) status of a BIG-IP system using tmsh, F5 documentation explicitly states that the administrator should use the following command:

show /cm failover-status

This command displays:

The current failover state (active, standby, or offline)

Detailed failover status information

The operational HA condition of the device within a device group

According to F5 Knowledge Base Article K08452454, the documented procedure for checking failover status is:

Log in to the TMOS Shell (tmsh)

Run show /cm failover-status

Why the other options are incorrect:

A. list /cm failover shows configuration settings, not operational HA status.

B. show /sys failover is not the documented command for checking current failover status and does not align with F5’s recommended procedure.

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: To maintain integrity in a High Availability environment, TMOS prevents the deletion of active Devic28e Groups. Procedurally, a device group is a container for synchronization; the Control Plane requires that you first strip the group of all associated members (devices) before the group object itself can be removed from the configuration.