F5CAB4 Questions and Answers

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:Generating a QKView is a standard procedure for identifying device health and upgrade readiness42. Within the Configuration Utility, this Control Plane diagnostic tool is located under System > Support43. This utility collects configuration and state data into a single file used by the iHealth 'Upgrade Advisor' to report on known bugs or compatibility issues prior to a version change.

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:

Traffic Groups are the mechanism BIG-IP uses to controlwhich device owns specific application trafficin a high-availability (HA) configuration. When maintenance is required on a device that iscurrently active for a traffic group, the correct and recommended action is tofail over that traffic groupto another device in the device group.

Failing over the traffic groupmoves ownership of that traffic group (and the virtual servers associated with it) to another available device without forcing the entire device into standby.

This allows targeted maintenance while minimizing impact to other traffic groups that may still be active on the device.

Why the other options are incorrect:

Ais unnecessary and incorrect; traffic groups are not recreated for routine maintenance.

Cforces theentire deviceto standby, which may move more traffic than intended.

D(Demote) affects device trust/priority behavior and is not the standard or recommended method for moving traffic group ownership.

Therefore, selecting theTraffic Group and choosing Failoveris the correct solution.

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:

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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Comprehensive and Detailed Explanation From BIG-IP Administration20 Control Plane Administration documents: Connectivity management involves ensuring that the physical layer matches the networking environment. Interface properties, including media speed, duplex settings, and MTU, are managed at the Control Plane level under the Network menu. To resolve a mismatch with an upstream switch, the administrator must navigate to Network > Interfaces to manually override auto-negotiation settings.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: The Control Plane is responsible for ARP (Address Resolution Protocol) management for Virtual Addresses. For a Virtual Server to be reachable, the BIG-IP must respond to ARP requests for that IP. If the "ARP" setting is disabled on the Virtual Address properties, upstream routers cannot resolve the MAC address of the BIG-IP, leading to connectivity failure even if the service itself is "Available."

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents: Audit logging is a specialized feature within TMOS designed to track administrative actions. According to F5 documentation, whenever a system object (like a virtual server, pool, or profile) is created, modified, or deleted, the system records the event. These logs are stored specifically in /var/log/audit. This is essential for control plane administration to track "who did what and when" regarding the device configuration.

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

In netstat output:

0.0.0.0:443means the service is bound toall available IPv4 interfaceson the system.

LISTENindicates the service is actively waiting for incoming connection requests.

Therefore, this output confirms that a service (commonly HTTPS/443, such as the BIG-IP Configuration Utility or an application listener) isactively listening on all interfaces, makingBthe correct answer.

Why the other options are incorrect:

Awould show 127.0.0.1:443 if it were loopback-only.

Cis incorrect because LISTEN explicitly indicates readiness to accept connections.

Dis unrelated; standby state does not affect socket binding shown by netstat.

Hence, the correct answer isB.

Comprehensive and Detailed Explanation From BIG-IP Administratio24n Control Plane Administration documents: TMOS Device Service Cluste25ring (DSC) allows for configuration changes to be made on any device within a synchronization group. If Auto-Sync is enabled, the Control Plane detects the change on the Standby unit and automatically propagates (pushes) that updated configuration to the other members of the HA pair