Reliable F5 F5CAB5 Test Tips | F5CAB5 Examinations Actual Questions

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F5 F5CAB5 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Given a scenario, interpret traffic flow: This domain covers understanding traffic patterns through client-server communication analysis and interpreting traffic graphs and SNMP results.
Topic 2
  • Determine resource utilization: This domain covers analyzing system resources including control plane versus data plane usage, CPU statistics per virtual server, interface statistics, and disk and memory utilization.
Topic 3
  • Identify the reason a virtual server is not working as expected: This section covers diagnosing virtual server issues including availability status, profile conflicts and misconfigurations, and incorrect IP addresses or ports.
Topic 4
  • 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 (Q15-Q20):

NEW QUESTION # 15
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?

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 # 16
Refer to the exhibit. An LTM device has a virtual server mapped to www.f5.com . Users report that when they connect to www.f5.com they are unable to receive content. What is the likely cause of the issue? (Choose one answer)

Answer: C

Explanation:
Based on the configuration screens provided in the exhibit, the primary reason for the connectivity failure is the disabled ARP setting on the Virtual Address.
Virtual Address ARP Setting: In a standard BIG-IP deployment, the Address Resolution Protocol (ARP) must be enabled for the Virtual Address (192.168.238.111 in this case). When enabled, the BIG-IP system responds to ARP requests from the local network gateway or adjacent devices for that specific IP address.
Exhibit Analysis: Looking at the "Virtual Address List >> 192.168.238.111" properties section, the ARP checkbox is unselected (unchecked). Because ARP is disabled, the upstream router or client cannot resolve the MAC address for 192.168.238.111, and the traffic never reaches the BIG-IP LTM.
Availability Indicators: Note the yellow circle (status indicator) on both the Virtual Server and the Pool Members. In F5 BIG-IP, a yellow status typically indicates that the object is "Available" (Enabled) but its monitors are not currently identifying it as "Up" (which would be a green circle), or it is in a "Monitor Unknown" state. However, even if a pool is available, the traffic must first reach the Virtual Server, which is prevented here by the lack of ARP.


NEW QUESTION # 17
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?

Answer: B

Explanation:
Troubleshooting failed SSL handshakes involves interpreting the resource limits defined by the system's license. 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 TPS. Confirming this peak via statistics andcomparing it to the current license is a standard troubleshooting step for SSL performance issues.


NEW QUESTION # 18
Users report that traffic is negatively affected every time a BIG-IP device fails over. The traffic becomes stabilized after a few minutes. What should the BIG-IP Administrator do to reduce the impact of future failovers?

Answer: B

Explanation:
When a virtual server's traffic flow is disrupted only during failover events and takes several minutes to stabilize, the issue is typically related to the ARP cache on upstream network devices47. By default, each BIG-IP in an HA pair uses its own unique hardware MAC address for traffic4848. When a failover occurs, the new active device takes over the floating IP addresses, but the upstream switch may still have the MAC address of the old device cached4949. Traffic fails until the switch's ARP entry is updated. "MAC Masquerade" is a troubleshooting feature that assigns a shared, virtual MAC address to the floating traffic group. Regardless of which BIG-IP is currently active, it will use this masqueraded MAC address for all traffic related to that group52. Because the MAC address seen by the network never changes during a failover, the upstream devices do not need to relearn ARP entries, resulting in an instantaneous transition and eliminating the performance drop reported by users


NEW QUESTION # 19
resume is enabled and a health check first fails and then passes?

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 # 20
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