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[General] F5CAB5 Actual Torrent - F5CAB5 Pass-King Materials & F5CAB5 Actual Exam

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【General】 F5CAB5 Actual Torrent - F5CAB5 Pass-King Materials & F5CAB5 Actual Exam

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F5 BIG-IP Administration Support and Troubleshooting Sample Questions (Q25-Q30):NEW QUESTION # 25
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)
  • A. All pool members are marked down.
  • B. The pool has a persistence profile configured.
  • C. Monitors have marked down multiple pool members.
  • D. The virtual server is marked down.
Answer: B,C
Explanation:
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.

NEW QUESTION # 26
A BIG-IP Administrator observes the following pool member status message:
Pool /Common/testpool member /Common/10.120.0.5:8090 monitor status down
[/Common/http: up, /Common/http2: down; last error:]
Why is this pool member being marked down? (Choose one answer)
  • A. The pool member is currently only serving HTTP traffic.
  • B. The pool member is currently only serving HTTPS traffic.
  • C. The pool member is currently only serving TCP traffic.
  • D. The pool member is currently only serving UDP traffic.
Answer: A
Explanation:
The pool member is marked DOWN because it is monitored by multiple health monitors, specifically an HTTP monitor and an HTTP/2 monitor. The status message clearly shows that the HTTP monitor is UP, while the HTTP/2 monitor is DOWN. In BIG-IP, when multiple monitors are assigned to a pool member, the default behavior is AND logic, meaning all assigned monitors must succeed for the pool member to be considered healthy.
In this scenario, the server is responding successfully to standard HTTP (likely HTTP/1.1) requests but does not support or respond correctly to HTTP/2 requests. As a result, the HTTP/2 monitor fails, which causes the overall monitor status to be DOWN, even though HTTP traffic itself is working.
This behavior is expected and documented in BIG-IP monitoring logic. Unless the monitor rule is explicitly changed to "at least one of", a single failing monitor will mark the pool member down. Therefore, the correct conclusion is that the pool member is only serving HTTP traffic, not HTTP/2.
The resolution would be to either remove the HTTP/2 monitor, correct the application to support HTTP/2, or adjust the monitor rule to match the intended health-check logic.

NEW QUESTION # 27
A BIG-IP Administrator observes the following messages in the /var/log/ltm log:
warning tmm[pid]: 011e0002: sweeper_segment_cb_any: Aggressive mode /Common/default-eviction-policy activated (0) (global memory) (345209/690176 pages) warning tmm[pid]: 011e0003: Aggressive mode sweeper /Common/default-eviction-policy (0) (global memory) 1 connections killed warning tmm[pid]: 011e0003: Aggressive mode sweeper /Common/default-eviction-policy (0) (global memory) 1 connections killed warning tmm[pid]: 011e0003: Aggressive mode sweeper /Common/default-eviction-policy (0) (global memory) 1 connections killed What is happening when the BIG-IP Administrator sees the messages displayed above? (Choose two answers)
  • A. The BIG-IP system starts reaping connections; all the connections will be dropped
  • B. The BIG-IP system starts reaping connections; some connections will be dropped
  • C. The global eviction policy is triggered due to TMM memory exhaustion
  • D. The global eviction policy is triggered due to swap memory being used too high
Answer: B,C
Explanation:
Comprehensive and Detailed 150 to 250 Words Explanation From BIG-IP Administration, Support, and Troubleshooting Documents:
These log messages indicate that the BIG-IP system's Traffic Management Microkernel (TMM) has entered aggressive eviction mode due to high global memory utilization. When TMM memory consumption reaches critical thresholds, BIG-IP activates the default eviction policy to protect system stability and prevent a full traffic processing failure. This condition directly corresponds to Option A, where the global eviction policy is triggered because TMM memory resources are nearing exhaustion.
Once aggressive mode is activated, BIG-IP begins using the connection sweeper mechanism, which selectively terminates existing connections to free memory. The repeated log entries stating "1 connections killed" confirm that the system is reaping some connections, not all connections. This behavior matches Option C. The eviction process is incremental and controlled, targeting idle, low-priority, or least-recently-used connections first to minimize impact on active traffic.
Option B is incorrect because BIG-IP does not drop all connections during aggressive mode; it only removes enough connections to relieve memory pressure. Option D is also incorrect because TMM eviction is based on TMM global memory usage, not swap memory utilization. TMM does not rely on swap space in the same way the host Linux system does.
These messages are a critical warning sign that the system is under memory stress and may require traffic optimization, connection limits, or hardware scaling.

NEW QUESTION # 28
resume is enabled and a health check first fails and then passes?
  • A. Available (Disabled)
  • B. Offline (Disabled)
  • C. Offline (Enabled)
  • D. Available (Enabled)
Answer: B
Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: The "Manual Resume" feature is a safety mechanism used when a pool is not working as expected due to flapping services or unstable backend applications. Normally, when a health monitor fails, the pool member is marked "Offline" (Red), and when the monitor passes, it automatically returns to "Available" (Green)47. However, if "Manual Resume" is enabled, the BIG-IP will not automatically put the member back into rotation after a failure48. Even if the health check begins to pass again, the member remains in an "Offline (Disabled)" state49. This requires an administrator to manually intervene and re-enable the member. This is a common point of confusion when troubleshooting; a member may show passing health checks but still not receive traffic because it is waiting for a manual administrative "resume" command. This feature is intended to prevent "unhealthy" servers from receiving traffic until an engineer has confirmed the root cause of the initial failure was resolved.

NEW QUESTION # 29
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
  • A. Least Connections (member)
  • B. Predictive (member)
  • C. Least Connections (node)
  • D. Predictive (node)
Answer: C
Explanation:
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.

NEW QUESTION # 30
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