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| Certification Vendor: | F5 Networks |
|---|---|
| Exam Name: | F5 BIG-IP Administration, Support and Troubleshooting |
| Exam Number: | F5CAB5 |
| Certificate Validity Period: | 2 years |
| Exam Duration: | 90 minutes |
| Related Certifications: | F5 Certified Solution Expert F5 Certified BIG-IP Professional |
| Exam Format: | Simulation-based items, Multiple choice, Drag and drop |
| Exam Price: | $150 USD |
| Available Languages: | English |
| Real Exam Qty: | 65 - 75 |
| Passing Score: | Approx. 70% |
| Recommended Training: | F5 Troubleshooting BIG-IP (TRB) Course F5 Administering BIG-IP (ADM) Course |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | F5 F5CAB5 Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE test centers |
| Pre Condition: | Recommended: Basic networking knowledge, experience with F5 BIG-IP administration, completion of F5 Administering BIG-IP (ADM) training |
| Official Syllabus URL: | https://www.f5.com/services/training-certification/certification/exams/f5cab5 |
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| Thema | Einzelheiten |
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11. Frage
What is the purpose of a core dump file?
Antwort: B
Begründung:
Core dumps help analyze system or application crashes.
12. Frage
The BIG-IP Administrator is investigating disk utilization on the BIG-IP device. (Exhibit shows
/dev/md4 mounted on / at 100% utilization). What should the BIG-IP Administrator check next?
Antwort: D
Begründung:
Monitoring resource utilization is essential for maintaining system stability. If the root (/) file system reaches 100% capacity, the BIG-IP may become unresponsive, fail to save configuration changes, or experience daemon crashes. When the / partition is full, the immediate troubleshooting step is to identify large or unnecessary files--such as old log files, core dumps, or temporary installer files--located specifically within that file system. In the provided exhibit,
/dev/md4 is explicitly listed at 100% usage for the / mount point. Checking other partitions like
/usr (which is at 82% in the exhibit) would not resolve the immediate "Full" status of the root directory. Administrators often use the du (disk usage) command via the CLI to find the problematic files. Managing disk space is a proactive task; however, when utilization hits 100%, it becomes a reactive troubleshooting emergency that must be resolved to restore the management plane's functionality.
13. Frage
A BIG-IP Administrator needs to determine why only one pool member is showing connections from the virtual server, resulting in uneven load balancing.
What two reasons would cause uneven load balancing? (Choose two answers)
Antwort: B,D
Begründung:
Uneven load balancing on a BIG-IP system typically occurs when traffic is not distributed evenly across all available pool members. One common reason is thatmonitors have marked down multiple pool members (Option B). When health monitors fail for specific pool members, BIG-IP automatically removes those members from load-balancing decisions. As a result, traffic is sent only to the remaining healthy member, creating the appearance that load balancing is not functioning correctly. This behavior is expected and aligns with BIG-IP's design to ensure traffic is sent only to healthy resources.
Another frequent cause isthe presence of a persistence profile on the pool or virtual server (Option C).
Persistence (such as source address or cookie persistence) forces subsequent client connections to be sent to the same pool member for session continuity. While persistence is critical for certain applications, it can override the load-balancing algorithm and cause most or all traffic to be directed to a single pool member, especially during low traffic volumes or testing scenarios.
The other options are incorrect because avirtual server marked down (Option A)would not pass traffic at all, andall pool members marked down (Option D)would result in no connections rather than uneven distribution.
This analysis follows standard BIG-IP troubleshooting methodology using pool status, monitor results, and persistence configuration review.
14. Frage
A BIG-IP Administrator uses backend servers to host multiple services per server. There are multiple virtual servers and pools defined, referencing the same backend servers. Which load balancing algorithm is most appropriate to have an equal number of connections on each backend server?17
Antwort: C
Begründung:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: When load balancing is not working as 23expected and connections appear skewed across physical hardware, the administrator must distinguish between "member"24 and "node" level balancing. A
"member" refers to a specific IP and Port combination (e.g., 10.1.1.1:80), whereas a "node" refers to the underlying IP address (10.1.1.1) regardless of the port25. If a single server hosts multiple services (Web, FTP, API) across different pools, using "Least Connections (member)" would only balance connections within each individual pool26. This could lead to a scenario where one server is overwhelmed because it is winning the
"least connections" count in three different pools simultaneously. By selecting "Least Connections (node)," the BIG-IP tracks the total number of concurrent connections to the physical IP address across all pools it belongs to27. This ensures that the administrator can maintain an equal distribution of work across the hardware, preventing performance degradation on backend servers that host multiple application services.
15. Frage
What information is required for a BIG-IP Administrator to open an F5 Support ticket?
Antwort: D
Begründung:
To ensure a support case is processed and routed efficiently, F5 specifies a mandatory set of baseline information.
* Serial Number: Required to verify the support contract and entitlement level for the hardware or virtual edition.
* QKView: This is described as the "first and most important thing to have when opening a case". It provides the F5 Support Engineer with the necessary diagnostic data to understand the system's current state and resource utilization.
* Problem Description: A precise description of the issue, including symptoms, when the problem started, and the business impact, is critical for routing the case to the correct technical team.
* Contact Info: Accurate contact information for the individual who will be working on the ticket with F5.
* Comparison: While packet captures (Option A) or UCS files (Option B) are often useful, they are not strictly required for the initial opening of all support tickets; however, a QKView is considered a primary prerequisite for technical analysis.
16. Frage
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