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[Hardware] F5CAB5 Study Tool & Exam F5CAB5 Cram

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【Hardware】 F5CAB5 Study Tool & Exam F5CAB5 Cram

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F5 BIG-IP Administration Support and Troubleshooting Sample Questions (Q36-Q41):NEW QUESTION # 36
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)
  • A. The BIG-IP device is NOT able to reach the pool.
  • B. HTTP 1.1 is NOT appropriate for monitoring purposes.
  • C. The node health monitor is NOT responding.
  • D. The application is NOT responding with the expected Receive String.
Answer: C
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 # 37
Refer to the exhibit.

The image shows the status of a virtual server named application_vs in the BIG-IP Configuration Utility.
What is the cause of the status shown? (Choose two answers)
  • A. Pool member(s) administratively disabled
  • B. Virtual Server administratively disabled
  • C. Pool member(s) forced offline
  • D. Node(s) administratively disabled
Answer: A,D
Explanation:
The exhibit shows the virtual server application_vs with a status indicating it is offline but enabled. In BIG-IP terminology, this status means the virtual server itself is administratively enabled, but it is unable to pass traffic because no 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 reviewing pool and node availability states when diagnosing virtual server availability issues.

NEW QUESTION # 38
Due to a change in application requirements, a BIG-IP Administrator needs to modify the configuration of a Virtual Server to include a Fallback Persistence Profile. Which persistence profile type should the BIG-IP Administrator use for this purpose?
  • A. SSL
  • B. Hash
  • C. Universal
  • D. Source Address Affinity
Answer: D
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration S73upport and Troubleshooting documents: Persistence is critical for ensuring that a client's session remains with the same pool member throughout its duration. If primary persistence (like Cookie Persistence) fails-for instance, because the client has disabled cookies-load balancing will not work as expected, and the session may be broken. A "Fallback Persistence Profile" provides a backup method75. The most common and reliable fallback method is "Source Address Affinity"76. This method tracks the client's IP address in the BIG-IP's persistence table and ensures that any subsequent requests from that IP are routed to the same pool member, even if the primary persistence token is missing. Troubleshooting session drops often involves checking if a fallback method is configured to handle scenarios where the primary method is unsupported by the client's browser or environment. Without a fallback, the BIG-IP would revert to standard load balancing, potentially sending the client to a different server that lacks their session data.

NEW QUESTION # 39
A BIG-IP Administrator adds new Pool Members into an existing, highly utilized pool. Soon after, there are reports that the application is failing to load for some users. What pool level setting should the BIG-IP Administrator check?
  • A. Availability Requirement
  • B. Slow Ramp Time
  • C. Action On Service Down
  • D. Allow SNAT
Answer: B
Explanation:
When troubleshooting a pool that is not working correctly after adding new members, the "Slow Ramp Time" setting is a primary suspect. In a pool that is already under high load and using a "Least Connections" load balancing method, a newly added server has zero connections. Without a slow ramp time, the BIG-IP will immediately direct a massive flood of new connections to the new server to "balance" it with the others. This "thundering herd" effect can crash a newly initialized application server before it has time to warm up its caches or establish its own database connections. By setting a "Slow Ramp Time" (typically in seconds), the administrator ensures the BIG-IP gradually increases the connection ratio to the new member. This allows the server to stabilize and scale up its performance over time. If users report intermittent failures specifically coinciding with the expansion of a pool, checking this setting is a vital troubleshooting step to maintain pool health during maintenance.

NEW QUESTION # 40
Refer to the exhibit. A BIG-IP Administrator creates a new Virtual Server to load balance SSH traffic. Users are unable to log on to the servers. What should the BIG-IP Administrator do to resolve the issue? (Exhibit shows a Standard Virtual Server with an HTTP profile applied).
  • A. Set Source Address to 10.1.1.210
  • B. Set HTTP Profile to None9
  • C. Set Protocol to UDP8
  • D. Set Destination Addresses/Mask to 0.0.0.0/011
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Supp13ort and Troubleshooting documents: When troubleshooting a Virtual Server that is not working as expected, it is critical to ensure that the applied profiles match the type of traffic being processed. SSH (Secure Shell) is a non-HTTP protocol that operates over TCP. The exhibit indicates that an HTTP profile is applied to the Virtual Server14. An HTTP profile instructs the BIG-IP system to parse traffic as HTTP; however, since SSH traffic does not follow HTTP specifications, the BIG-IP's parser will fail to understand the data stream, typically resulting in dropped packets or reset connections15. To fix this, the administrator must set the HTTP profile to "None"16. This allows the Virtual Server to act as a "Standard" or "FastL4" listener that passes the encrypted SSH data transparently to the backend pool members without attempting application-layer inspection. This highlights a common troubleshooting step: verifying that L7 profiles are not inadvertently applied to L4 traffic, which disrupts the expected traffic flow between the client and the server.

NEW QUESTION # 41
......
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