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| Certification Vendor: | F5 Networks |
|---|---|
| Exam Name: | F5 BIG-IP Administration, Support and Troubleshooting |
| Exam Number: | F5CAB5 |
| Real Exam Qty: | 65 - 75 |
| Available Languages: | English |
| Passing Score: | Approx. 70% |
| Related Certifications: | F5 Certified BIG-IP Professional F5 Certified Solution Expert |
| Exam Price: | $150 USD |
| Exam Duration: | 90 minutes |
| Exam Format: | Simulation-based items, Multiple choice, Drag and drop |
| Certificate Validity Period: | 2 years |
| Recommended Training: | F5 Administering BIG-IP (ADM) Course F5 Troubleshooting BIG-IP (TRB) 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 |
It Contains a pool of real F5 F5CAB5 exam questions. This BIG-IP Administration Support and Troubleshooting (F5CAB5) practice test is compatible with every windows-based system. One downloaded does not require an active internet connection to operate. You can self-evaluate your mistakes after each F5CAB5 Practice Exam attempt and work on the weak points that require more attention.
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NEW QUESTION # 76
A BIG-IP Administrator configured the following virtual server to pass traffic on all addresses and ports. After configuration is completed, the BIG-IP Administrator notices that the virtual server is unable to pass traffic.
ltm virtual forwarding_any_vs {
destination 0.0.0.0:any
ip-forward
mask 255.255.255.255
profiles {
fastL4 { }
}
serverssl-use-sni disabled
source 0.0.0.0/0
translate-address disabled
translate-port disabled
}
Which part of the configuration is the cause of the issue? (Choose one answer)
Answer: C
Explanation:
This virtual server is intended to function as a forwarding (IP-forwarding) virtual server, which is commonly used for routing or firewall-style deployments where BIG-IP forwards traffic transparently without load balancing or address translation. For a forwarding virtual server to match and pass all traffic, the destination must be configured as 0.0.0.0:any with a mask of 0.0.0.0, not 255.255.255.255.
The configured mask 255.255.255.255 represents a /32 host mask, which restricts the virtual server to matching traffic destined only for the exact IP address 0.0.0.0. Since 0.0.0.0 is not a valid routable destination for normal traffic, no packets will ever match the virtual server, causing it to pass no traffic at all.
This is a well-documented BIG-IP behavior:
destination 0.0.0.0:any
mask 0.0.0.0
together define a catch-all forwarding virtual server.
The destination itself (Option A) is correct for a forwarding VS, and disabling address translation (Option C) is expected and required for IP-forwarding mode. Therefore, the incorrect subnet mask is the sole reason the virtual server is not functioning as expected.
NEW QUESTION # 77
Users are unable to reach an application. The BIG-IP Administrator checks the Configuration Utility and observes that the Virtual Server has a red diamond in front of the status. What is causing this issue?
Answer: A
Explanation:
In the BIG-IP Configuration Utility, the status icon (shape and color) provides immediate feedback on why a virtual server is not working as expected81. A "Red Diamond" indicates that the object is "Offline" and unavailable to process traffic82. For a virtual server, this specific status typically means it has inherited an offline state from its mandatory backend resources8383. If all pool members associated with the virtual server have failed their health monitors, the virtual server will transition to a red diamond status because it has no healthy destination for incoming requests. This is distinct from a "Black Circle," which would indicate the virtual server has been manually "Disabled" by an administrator85858585. To troubleshoot a red diamond, the administrator must examine the associated pool and its members to determine why the health monitors are failing (e.g., server crashes, network path failures, or incorrect monitor strings). Resolving the health check failures on the pool members will return the virtual server to an "Available" (Green) status.
NEW QUESTION # 78
In a busy environment where a pool is not functioning as expected after adding new members, which setting is critical for managing traffic to the new member?
Answer: A
Explanation:
When a pool is not working as expected immediately after adding new members to a busy environment, the
"Slow Ramp Time" setting is a critical factor
In a pool using the "Least Connections" load balancing method, a new member starts with zero active connections5858. Without a slow ramp time, the BIG-IP will immediately direct a high volume of new traffic to this server to "equalize" it with other members. This sudden surge can overwhelm the server's application stack before it has fully initialized or warmed its caches, leading to failures. By configuring a "Slow Ramp Time," the administrator ensures that the system gradually increases the amount of traffic sent to the new member over a specified duration. The traffic sent is proportional to the time the member has been available relative to the ramp time setting62. If the application fails only for users routed to new servers, reviewing this setting helps ensure that new capacity is integrated into the pool without disrupting service performance
NEW QUESTION # 79
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?
Answer: A
Explanation:
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 crashes83. 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 system84. In the provided exhibit, /dev/md4 is explicitly listed at 100% usage for the / mount point85. Checking other partitions like /usr (which is at 82% in the exhibit) would not resolve the immediate "Full" status of the root directory86. 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.
NEW QUESTION # 80
Which command shows routing table?
Answer: B
Explanation:
Displays routes used for packet forwarding decisions.
NEW QUESTION # 81
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