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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | BIG-IP Administration Support and Troubleshooting (F5CAB5) |
| Exam Number: | F5CAB5 |
| Passing Score: | 245 |
| Available Languages: | English |
| Exam Duration: | 30 minutes |
| Real Exam Qty: | 25-30 |
| Exam Price: | USD 50 (online) / USD 65 (test center) |
| Related Certifications: | BIG-IP Administration Data Plane Configuration BIG-IP Administration Data Plane Concepts BIG-IP Administration Control Plane Administration BIG-IP Administration Install, Initial Configuration, and Upgrade |
| Exam Format: | Multiple Choice |
| Recommended Training: | Troubleshooting BIG-IP Training Administering BIG-IP Course |
| Exam Registration: | F5 Certification Portal F5 Education Exam Page |
| 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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질문 # 59
Refer to the exhibit.
The image shows the status of a virtual server namedapplication_vsin the BIG-IP Configuration Utility.
What is the cause of the status shown? (Choose two answers)
정답：A,B
설명：
The exhibit shows the virtual serverapplication_vswith a status indicating it isoffline but enabled. In BIG-IP terminology, this status means the virtual server itself is administratively enabled, but it is unable to pass traffic becauseno usable pool members are available.
Two common and documented causes for this condition are:
Pool member(s) administratively disabled (Option A):When all pool members are administratively disabled, BIG-IP removes them from load-balancing decisions. Even though the virtual server remains enabled, it has no available pool members to send traffic to, resulting in an offline status.
Node(s) administratively disabled (Option C):Pool members inherit the status of their parent nodes. If a node is administratively disabled, all associated pool members are also marked unavailable. This condition causes the virtual server to show as offline, even though the virtual server configuration itself is correct.
The other options are incorrect:
Forced offline pool members (Option B)result in a different operational intent and are explicitly set for maintenance scenarios.
Virtual server administratively disabled (Option D)would show the virtual server as disabled, not enabled/offline.
This behavior is consistent with BIG-IP traffic management logic and is commonly verified by reviewingpool and node availability stateswhen diagnosing virtual server availability issues.
질문 # 60
Which two methods should the BIG-IP Administrator use to troubleshoot a pool member that has been marked DOWN by its health monitor? (Choose two answers)
정답：A,D
설명：
When a pool member is marked DOWN, it indicates that the configured health monitor is failing. The most effective troubleshooting approach is to focus on the monitor behavior and the actual traffic between BIG-IP and the pool member.
Enabling monitor logging (Option B) is a recommended first step. Monitor logging provides detailed information about why the health check is failing, such as timeouts, connection refusals, incorrect responses, or unexpected status codes. This directly correlates with BIG-IP troubleshooting best practices and allows administrators to confirm whether the failure is due to application behavior, incorrect monitor configuration, or network reachability.
Collecting a TCPdump packet capture (Option D) is also a highly effective method. A packet capture allows the administrator to verify whether the monitor probes are being sent, whether responses are received, and whether packets are being dropped, reset, or malformed. This is especially valuable when diagnosing firewall issues, SSL problems, or application-level failures.
Reviewing pool statistics (Option C) is useful for general monitoring but does not explain why a health monitor is failing. Reviewing the routing table (Option A) is typically unnecessary unless there is evidence of a broader routing issue affecting multiple destinations.
질문 # 61
Where should the BIG-IP Administrator go in the GUI to verify the status of pool members of a pool?
정답：C
설명：
To verify the specific health and availability status of individual members within a specific pool, the administrator must navigate to the Members tab of that specific pool.
* Navigation Path: The correct path is Local Traffic > Pools > Pool List, then clicking on the name of the <pool_in_question>, and finally selecting the Members tab. This screen provides a granular view of each member's IP address, port, and their current status (indicated by the colored icons: Green, Red, Yellow, or Blue).
* Why Option A is correct: While you can see a general status summary on the Pool List page (Option B), that page only shows the status of the pool as a whole. To troubleshoot why a pool is not working or to see which specific member is down, you must drill down into the Members tab.
* Evaluation of Other Options:
* Local Traffic -> Pools (Option B): This leads to the Pool List. It shows the aggregate status of all pools but does not list individual member details or their specific monitor results without further clicking.
* Local Traffic -> Virtual Servers -> Statistics (Option C): This path shows traffic statistics (bits in/out, connections) for virtual servers, not the health monitor status of individual pool members.
* Local Traffic -> Nodes (Option D): While this shows the health of the underlying IP address (Node), it does not show the status of the specific service (Port/Member) within a pool. A Node might be "Up" (ICMP), while the Pool Member is "Down" (HTTP failure).
질문 # 62
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?
정답：D
설명：
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.
질문 # 63
A BIG-IP Administrator receives reports from users that SSL connections to the BIG-IP device are failing.
Upon checking the log files, the administrator notices: SSL transaction (TPS) rate limit reached. stats show a maximum of 1200 client-side SSL TPS and 800 server-side SSL TPS. What is the minimum SSL license limit required to handle this peak?
정답：A
설명：
Troubleshooting failed SSL handshakes involves interpreting the resource limits defined by the system's license8888. The log message SSL transaction (TPS) rate limit reached indicates the BIG-IP is dropping SSL connections because it has exceeded its licensed "Transactions Per Second" capacity. When analyzing stats to determine the correct license level, the administrator must focus on "Client-side" SSL TPS. This represents the initial encrypted handshakes between users and the BIG-IP virtual servers91. In this scenario, the peak client-side demand is 1200 TPS. While the 800 server-side transactions represent re-encryption toward the backend, F5's primary SSL TPS license limits typically apply to the client-facing side of the traffic flow.
Therefore, to resolve the intermittent connectivity issues and ensure the virtual server works reliably during peaks, the license must be upgraded to at least 1200 TPS949596969696.9798Confirming this peak via statistics andcomparing it to the current license is a standard troubleshooting step for SSL performance issues.
질문 # 64
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