F5 F5CAB5 Sample Questions: BIG-IP Administration Support and Troubleshooting - Free4Torrent Help you Prepare Exam Easily

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F5 F5CAB5 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Given a scenario, interpret traffic flow: This domain covers understanding traffic patterns through client-server communication analysis and interpreting traffic graphs and SNMP results.
Topic 2
  • Identify the reason a pool is not working as expected: This domain focuses on troubleshooting pools including health monitor failures, priority group membership, and configured versus availability status of pools and members.
Topic 3
  • Determine resource utilization: This domain covers analyzing system resources including control plane versus data plane usage, CPU statistics per virtual server, interface statistics, and disk and memory utilization.
Topic 4
  • Given a scenario, review basic stats to confirm functionality: This section involves interpreting traffic object statistics and network configuration statistics to validate system functionality.
Topic 5
  • Identify network level performance issues: This section focuses on diagnosing network problems including packet capture needs, interface availability, packet drops, speed and duplex settings, and TCP profile optimization.,

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F5 BIG-IP Administration Support and Troubleshooting Sample Questions (Q19-Q24):

NEW QUESTION # 19
A BIG-IP Administrator makes a configuration change to a Virtual Server on the Standby device of an HA pair. The HA pair is currently configured with Auto-Sync Enabled. What effect will the change have on the HA pair configuration?

Answer: B

Explanation:
Understanding High Availability (HA) synchronization behavior is critical for maintaining a stable environment. In a device group where "Auto-Sync" is enabled, the BIG-IP system monitors the management plane for any configuration updates across all members. While best practices often suggest making changes on the "Active" device, TMOS allows changes on any device within the group. When a change is made on the "Standby" device, the system detects a configuration mismatch and, because Auto-Sync is enabled, it automatically pushes those changes to the other devices in the sync group, including the current Active member. To troubleshoot if this is working correctly, the administrator should review the "Sync Status" stats in the Configuration Utility. If the changes do not propagate, it suggests a breakdown in the HA trust relationship or network connectivity issues on the failover VLAN. Proper interpretation of this scenario confirms that the HA functionality is operating correctly, ensuring that both devices have a consistent set of virtual servers and pools, which is vital for seamless failover.


NEW QUESTION # 20
A BIG-IP Administrator makes a configuration change to the BIG-IP device. Which file logs the message regarding the configuration change?

Answer: B

Explanation:
The BIG-IP system uses the audit log to track administrative actions and configuration changes.
* Audit Logging Functionality: When a user modifies the configuration via the Configuration Utility (GUI), the Traffic Management Shell (tmsh), or iControl, the system records the event in the audit log.
This includes the name of the user who made the change, the timestamp, and the specific command or object that was modified.
* Log Location: The audit log is stored at /var/log/audit.
* Evaluation of Other Options:
* /var/log/messages (Option A) contains general system and kernel messages but is not the primary source for configuration change details.
* /var/log/secure (Option B) primarily logs authentication and authorization attempts (logins and logouts).
* /var/log/user.log (Option D) is a generic Linux log file for user-level applications and does not track BIG-IP LTM configuration changes.


NEW QUESTION # 21
Plaintext
warning tmm[<pid>]: 011e0002:4: sweeper_segment_cb_any: Aggressive mode
/Common/default- eviction-policy activated (0) (global memory).
(345209/690176 pages)
warning tmm[<pid>]: 011e0003:4: Aggressive mode sweeper:
/Common/default-eviction-policy (0) (global memory) 1 Connections
killed
What is happening when the BIG-IP Administrator sees the messages in the LTM log displayed above? (Pick the 2 correct responses below)

Answer: C,D

Explanation:
These log messages indicate that the BIG-IP system is under significant resource pressure and has activated its Adaptive Connection Management.
Global Eviction Policy: The message Aggressive mode ... activated (global memory) confirms that the system has reached a memory utilization threshold that triggers the eviction policy. This happens because TMM (the data plane) is running low on available memory pages.
Sweeper/Reaping: Once in "Aggressive mode," the BIG-IP "sweeper" starts reaping (terminating) connections to free up memory. The log Connections killed confirms this is occurring.
Impact: The system does not drop all connections; it targets connections based on the eviction policy (e.g., oldest connections or those exceeding limits) to bring memory usage back to safe levels. Thus, some connections will be dropped (Option A), and the cause is TMM memory exhaustion (Option C).


NEW QUESTION # 22
A BIG-IP device sends out the following SNMP trap: big-ipo.f5.com - bigipExternalLinkChange Link: 1.0 is DOWN. Where in the BIG-IP Configuration utility should the BIG-IP Administrator verify the current status of Link 1.0?

Answer: B

Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents:Identifying network-level performance issues often starts with investigating hardware-level alerts78. In F5 terminology, a "Link" like "1.0" or "1.1" refers to a physical interface on the appliance79.
When an SNMP trap reports that a link is "DOWN," it indicates a loss of signal or an administrative shutdown of the physical port80. To verify this, the administrator must navigate to Network > Interfaces > Interface List81. This screen provides real-time status, showing whether the interface is "up," "down," or
"uninitialized," as well as any media speed or duplex mismatches that could be causing performance degradation82. Troubleshooting this is the first step in resolving "pool member down" or "VLAN failsafe" issues, as a down interface will take down any VLANs associated with it, immediately halting all traffic flow for the services relying on that physical path.


NEW QUESTION # 23
How can you check HA failover status?

Answer: C

Explanation:
Displays active/standby state and failover details.


NEW QUESTION # 24
......

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