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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | BIG-IP Administration Support and Troubleshooting (F5CAB5) |
| Exam Number: | F5CAB5 |
| Exam Duration: | 30 minutes |
| Exam Format: | Multiple Choice |
| Real Exam Qty: | 25-30 |
| Available Languages: | English |
| Related Certifications: | BIG-IP Administration Data Plane Configuration BIG-IP Administration Data Plane Concepts BIG-IP Administration Install, Initial Configuration, and Upgrade BIG-IP Administration Control Plane Administration |
| Exam Price: | USD 50 (online) / USD 65 (test center) |
| Passing Score: | 245 |
| Recommended Training: | Troubleshooting BIG-IP Training Administering BIG-IP Course |
| Exam Registration: | F5 Education Exam Page F5 Certification Portal |
| Sample Questions: | F5 F5CAB5 Sample Questions |
| Exam Way: | Online proctored (Certiverse) or test center proctored (Pearson VUE) |
| Pre Condition: | No formal prerequisites required; part of the F5 Certified Administrator, BIG-IP certification path (5-exam series). |
| Official Syllabus URL: | https://education.f5.com/exams/big-ip-administration-support-and-troubleshooting-f5cab5 |
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NEW QUESTION # 81
A BIG-IP Administrator needs to view the CPU utilization of a particular Virtual Server. Which section of the Configuration Utility should the administrator use for this purpose?
Answer: D
Explanation:
Monitoring granular resource utilization is essential when troubleshooting performance degradation for specific applications. While global system stats show overall hardware health, they do not pinpoint which virtual server is overconsuming resources during traffic spikes. To identify the specific application causing a high CPU load, the administrator should navigate to Statistics > Module Statistics > Local Traffic > Virtual Servers. This section provides detailed metrics for each virtual server, including CPU cycles used for traffic processing and iRule execution. Identifying a "top- talker" or a problematic virtual server allows the administrator to take targeted action, such as optimizing an inefficient iRule, adjusting compression levels, or offloading the virtual server to a different device group. This targeted troubleshooting ensures that one high-demand virtual server does not negatively impact the performance of other services running on the same BIG-IP hardware, maintaining overall system stability and resource availability.
NEW QUESTION # 82
A BIG-IP Administrator notices that one of the servers that runs an application is NOT receiving any traffic. The BIG-IP Administrator examines the configuration status of the application and observes the displayed monitor configuration and affected pool member status.
What is the possible cause of this issue? (Choose one answer)
Answer: A
Explanation:
The key clue in the exhibit is the pool member's availability showing "Offline (Enabled) - Parent down". In BIG-IP terminology, a pool member inherits the status of its parent node. If the node is marked down (for example, by a node-level monitor or a default "node is down" condition), then all pool members using that node IP will also be marked down and will not receive any traffic, even if the application service on the member port might be healthy.
While the HTTPS monitor configuration (send/receive strings) is displayed, the status specifically indicates a node (parent) failure, not a service-level failure. If the problem were the application not matching the receive string, you would typically see the member down due to the member's monitor failing (and the status would reflect monitor failure details), rather than "parent down." Option D is too broad; BIG-IP can generally reach the subnet (other servers work), and this symptom points to a specific node condition. Option C is incorrect because HTTP/1.1 is commonly used for monitoring and is valid when properly formatted (especially with a Host header). Therefore, the most likely cause is that the node health monitor is not responding, causing the node-and consequently the member-to be marked down.
NEW QUESTION # 83
A Virtual Server uses an iRule to send traffic to pool members depending on the URI. The BIG-IP Administrator needs to modify the pool member in the iRule. Which event declaration does the BIG-IP Administrator need to change to accomplish this?
Answer: D
Explanation:
In F5 TMOS administration, the traffic flow is processed through specific event huddles w3ithin iRules. To troubleshoot or m4odify traffic based on a URI (Uniform Resource Identifier), the BIG-IP system must first parse the application-layer data. The HTTP_REQUEST event is triggered when the system has fully received and parsed the HTTP request headers from the client5. This is the correct point to implement logic that selects a pool or pool member based on the path or file requested (e.g., /images or /api). Using CLIENT_ACCEPTED would be too early in the troubleshooting process because that event triggers at the L4 (TCP) connection establishment phase, before any URI information is available6. Conversely, HTTP_RESPONSE occurs during the return traffic from the server, which is too late to make a load balancing decision7. For troubleshooting virtual server behavior where URIs are involved, ensuring the iRule is attached to a Virtual Server with an HTTP profile and using the HTTP_REQUEST event is essential for proper traffic steering and inspection.
NEW QUESTION # 84
Some users who connect to a busy Virtual Server have connections reset by the BIG-IP system.
Pool member resources are NOT a factor in this behavior. What is a possible cause for this behavior?
Answer: A
Explanation:
When troubleshooting intermittent connection resets on a "busy" Virtual Server, the administrator must examine the configured thresholds. A "Connection Limit" is a hard cap on the number of concurrent connections a Virtual Server or pool member can handle. If this limit is set too low, the BIG-IP will reset any new connection attempts once the threshold is reached. The key indicator in this scenario is that the problem only affects "some users" and happens when the server is
"busy," suggesting that the system is hitting a capacity ceiling rather than suffering from a persistent configuration error. Unlike a missing SSL profile, which would likely cause all connections to fail, or a "Connection Rate Limit," which throttles how fast connections arrive, a
"Connection Limit" focuses on the total volume. Identifying this as the cause requires reviewing the Virtual Server's statistics to see if the "Current Connections" count is consistently peaking at the configured limit value.
NEW QUESTION # 85
A BIG-IP Administrator makes a configuration change to the BIG-IP device. Which file logs the message regarding the configuration change?
Answer: D
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 # 86
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