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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | BIG-IP Administration Support and Troubleshooting (F5CAB5) |
| Exam Number: | F5CAB5 |
| Exam Price: | USD 50 (online) / USD 65 (test center) |
| Real Exam Qty: | 25-30 |
| Exam Duration: | 30 minutes |
| Available Languages: | English |
| Exam Format: | Multiple Choice |
| Passing Score: | 245 |
| Related Certifications: | BIG-IP Administration Control Plane Administration BIG-IP Administration Install, Initial Configuration, and Upgrade BIG-IP Administration Data Plane Configuration BIG-IP Administration Data Plane Concepts |
| Recommended Training: | Administering BIG-IP Course Troubleshooting BIG-IP Training |
| Exam Registration: | F5 Education Exam Page F5 Certification Portal |
| 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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43. Frage
Some users who connect to a busy Virtual Server have connections reset by the BIG-IP system. Pool member resources are NOT a factor in this behavior. What is a possible cause for this behavior?
Antwort: B
Begründung:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: When troubleshooting intermittent connection resets on a "busy" Virtual Server, the administrator must examine the configured thresholds62. A "Connection Limit" is a hard cap on the number of concurrent connections a Virtual Server or pool member can handle63. If this limit is set too low, the BIG-IP will reset any new connection attempts once the threshold is reached64. The key indicator in this scenario is that the problem only affects "some users" and happens when the server is "busy," suggesting that the system is hitting a capacity ceiling rather than suffering from a persistent configuration error65. Unlike a missing SSL profile, which would likely cause all connections to fail, or a "Connection Rate Limit," which throttles how fast connections arrive, a "Connection Limit" focuses on the total volume66. Identifying this as the cause requires reviewing the Virtual Server's statistics to see if the "Current Connections" count is consistently peaking at the configured limit value.
44. Frage
Refer to the exhibit.
The BIG-IP Administrator has modified an iRule on one device of an HA pair. The BIG-IP Administrator notices there is NO traffic on the BIG-IP device in which they are logged into. What should the BIG-IP Administrator do to verify if the iRule works correctly?
Antwort: A
Begründung:
Based on the provided exhibits, the BIG-IP device is currently in a Standby state ("ONLINE (STANDBY)") and has a sync status of "Changes Pending" (Yellow icon).
Understanding Device State and Traffic: In an Active/Standby High Availability (HA) pair, traffic is processed by the Active device. The exhibit confirms the administrator is logged into the Standby device, which explains why there is "NO traffic" currently observed on this specific unit.
Configuration Synchronization (ConfigSync): When an administrator modifies a local object, such as an iRule, on one member of a device group, the changes must be synchronized to the other members to ensure consistency. The "Changes Pending" status indicates that the local configuration on this device is newer than the configuration on other group members.
Push vs. Pull: * Push: Sends the configuration from the current device to the other members of the device group.
Pull: Overwrites the current device's configuration with the configuration from another member of the group.
Resolving the Scenario: Since the administrator modified the iRule on "this device," they must Push the configuration to the group so the Active device receives the updated iRule. To verify the iRule works, the administrator can then monitor the traffic on the Active device or initiate a manual failover to make "this device" Active, allowing it to process traffic with the new iRule.
Option D is the correct administrative workflow: synchronize the changes to the group (Push) and then monitor the traffic flow to validate the new logic.
45. Frage
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?
Antwort: D
Begründung:
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.
46. Frage
In an F5 BIG-IP system, a pool is configured with a health monitor and the "ManualResume" feature is Enabled. If a poolmember is marked Offline(Red) due to a health monitor failure, what will be the status of the member once the health monitor successfully passes again?
Antwort: C
Begründung:
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). However, if "Manual Resume" is enabled, the BIG-IP will not automatically put the member back into rotation after a failure. Even if the health check begins to pass again, the member remains in an "Offline (Disabled)" state. 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.
47. Frage
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)
Antwort: A,D
Begründung:
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.
48. Frage
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