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F5 F5CAB5 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Identify the reason load balancing is not working as expected: This domain addresses troubleshooting load balancing by analyzing persistence, priority groups, rate limits, health monitor configurations, and availability status.
Topic 2
  • Identify network level performance issues: This section focuses on diagnosing network problems including packet capture needs, interface availability, packet drops, speed and duplex settings, and TCP profile optimization.,
Topic 3
  • Identify the reason a pool is not working as expected: This domain focuses on troubleshooting pools including health monitor failures, priority group membership, and configured versus availability status of pools and members.

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F5 BIG-IP Administration Support and Troubleshooting Sample Questions (Q11-Q16):

NEW QUESTION # 11
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)

Answer: A,D

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.


NEW QUESTION # 12
In the BIG-IP Configuration Utility, a user requests a single screen view to determine the status of all Virtual Servers and associated pool members, as well as any iRules in use. Where should the BIG-IP Administrator instruct the user to find this view?32

Answer: D

Explanation:
Comprehensive and Detailed Explanation From BIG-IP A41dministration Support and Troubleshooting documents:To confirm functionality across a complex environment, the "Network Map" is the most efficient troubleshooting tool in the Configuration Utility43. It provides a hierarchical, visual representation of the traffic management objects44. A single glance allows the administrator to see the status of a Virtual Server (Green/Red/Yellow), the status of its associated pool, the health of individual pool members, and which iRules are currently attached45. This view is superior to the standard "Virtual Server List" for troubleshooting because it maps the dependencies between objects46. For example, if a Virtual Server is "Red," the Network Map will show if that status is inherited from a failed pool or a specific monitor failing on a pool member.
Reviewing these basic stats in the Network Map helps the administrator quickly isolate whether a failure is at the service level (Virtual Server), the logic level (iRule), or the hardware level (Pool Member).


NEW QUESTION # 13
What determines whether a pool member is marked up or down?

Answer: B

Explanation:
Health monitors check backend availability and determine pool member status.


NEW QUESTION # 14
Which command restarts a BIG-IP service?

Answer: A

Explanation:
Used to restart specific system services.


NEW QUESTION # 15
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)

Answer: B,D

Explanation:
These log messages indicate that the BIG-IP system's Traffic Management Microkernel (TMM) has enteredaggressive eviction modedue tohigh global memory utilization. When TMM memory consumption reaches critical thresholds, BIG-IP activates thedefault eviction policyto 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 theconnection sweeper mechanism, which selectively terminates existing connections to free memory. The repeated log entries stating" connections killed"confirm that the system isreaping 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.


NEW QUESTION # 16
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