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An LTM device has a virtual server mapped to www.f5.com. Users report that when they connect to /resources/201.1.2h.l_l.com they are unable to receive content. What is the likely cause of the issue?
Answer : B
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.'
A BIG-IP Administrator reviews the Plane CPU Usage performance chart and discovers a high percentage of Control Plane utilization. Which type of traffic does this indicate a higher usage of?
Answer : A
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.
Which TMSH command initiates a manual configuration synchronization to the specified device group? (Choose one answer)
Answer : C
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
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 <device_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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A BIG-IP administrator is troubleshooting inconsistent configuration objects on devices in a device group. The administrator uses the command:
tmsh run /cm watch-devicegroup-device
and observes the following output:
devices
20:21 sync_test bigip_a 3273 bigip_a 14:27:00
20:21 sync_test bigip_b 1745 bigip_b 13:52:34 13:42:04
20:21 sync_test bigip_c 1745 bigip_a 13:52:34 13:42:04
What two conclusions can be made about this output? (Choose two answers)
Answer : A, B
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
watch-devicegroup-device shows (among other columns) the commit ID (cid.id / shown here as clu_id), the originating device for that commit (cid-orig / shown here as cl_orig), and the time the configuration change was made (cid.time / shown here as cl_time). The highest/newest commit ID and its time represent the most recent configuration change seen among the devices. (clouddocs.f5.com)
bigip_a has the latest configuration (A) because it shows commit ID 3273 at 14:27:00, which is newer than commit ID 1745 at 13:52:34 on bigip_b and bigip_c. (clouddocs.f5.com)
Two devices are out of date (B) because bigip_b and bigip_c are still on the older commit ID 1745, 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 same change timestamp/commit, not that it is the correct or latest configuration. The ''latest'' is indicated by the newest commit ID/time (here, bigip_a). (clouddocs.f5.com)
Which log file should the BIG-IP Administrator check to determine if a specific user tried to log in to the BIG-IP Configuration Utility? (Choose one answer)
Answer : B
Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:
On BIG-IP systems, all authentication attempts for administrative access---including logins to the Configuration 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/tallylog tracks account lockouts and failed attempt counters, not detailed login attempts.
/var/log/ltm logs traffic management events, not administrative authentication.
/var/log/httpd logs 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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