Free Practice Questions for F5 F5CAB4 Exam

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: When a failover occurs, the newly active device must inform the surrounding network that it now "owns" the shared IP addresses. Without MAC Masquerade, the new device uses its own hardware MAC, requiring upstream routers to update their ARP tables (which causes a delay). MAC Masquerading allows the HA pair to share a "floating" MAC address, ensuring the Control Plane transition is transparent to the network layer

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

BIG-IP providestwo supported and documented methodsto manually force a device intostandbystate in a high-availability (HA) configuration:

CLI method (A):

tmsh run /sys failover device standby

This is the correct and supported TMSH command to force thelocal deviceto transition fromactivetostandby.

Configuration Utility method (B):Navigating toDevice Management > Devices > Local Device (Self)and selectingForce to Standbyperforms the same operation through the GUI and is fully supported.

Why the other options are incorrect:

C is incorrect: Traffic Groups do not provide a “Force to Standby” option for the local device; traffic groups are used to manage which device owns specific traffic, not to force device-level failover.

D is incorrect: tmsh run /sys failover standby isnot a valid TMSH command. The correct syntax requires device standby.

Thus, the correct answers areA and B.

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:

In the BIG-IPConfiguration Utility, all system backup and restore operations—includingUCS (User Configuration Set) file restoration—are performed from theArchivessection.

The correct navigation path is:

System > Archives

From this location, the administrator can:

Upload UCS files

Restore UCS backups

Manage system archive files used for backup and recovery

Why the other options are incorrect:

A. System > Configurationis used for general system settings, not backup restoration.

C. Local Traffic > Virtual Serversis used for application traffic objects.

D. Local Traffic > Policiesmanages traffic policies, not system backups.

Therefore, the correct section to restore a UCS file using the Configuration Utility isSystem > Archives.

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

When a BIG-IP Administrator changesmodule provisioning(for example, enablingASMon a system previously provisioned only forLTM), the BIG-IP system must restart theTraffic Management Microkernel (TMM)process.

TheTMM processis responsible for:

Traffic handling

LTM, ASM, and other traffic-processing modules

Enforcing security and application policies

Provisioning changes affect how traffic modules are loaded and integrated into TMM. As a result,TMM is restarted, which causes atemporary interruption of traffic processing. This is expected behavior and is why module provisioning changes should be planned during amaintenance window.

Why the other options are incorrect:

A. bdis related to blade/platform management, not module provisioning.

C. sshdhandles SSH access and is not affected by provisioning changes.

D. httpdsupports the Configuration Utility (GUI) and does not restart due to module provisioning.

Therefore, the correct answer isB. tmm.

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Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:Monitoring and reporting current device status involves tracking the health of traffic objects like Virtual Servers20. The Control Plane logs transition events—such as a Virtual Server moving from 'Available' (green) to 'Offline' (red) due to health monitor failures—in the /var/log/ltm file21212121. While the audit log tracks who changed a configuration, the LTM log tracks system-initiated status changes22222222.

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 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: 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.