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Valid F5 F5CAB5 Exam Experience | Valid F5CAB5 Exam Tutorial

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Valid F5 F5CAB5 Exam Experience | Valid F5CAB5 Exam Tutorial

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F5 BIG-IP Administration Support and Troubleshooting Sample Questions (Q14-Q19):NEW QUESTION # 14
Which two methods should the BIG-IP Administrator use to troubleshoot a pool member that has been marked DOWN by its health monitor? (Choose two answers)
  • A. Review the BIG-IP routing table using netstat -rn to show all routes.
  • B. Review the pool and pool-member statistics table for error data.
  • C. Enable monitor logging for the pool member that is DOWN.
  • D. Collect a TCPdump packet capture for the DOWN pool member.
Answer: C,D
Explanation:
When a pool member is marked DOWN, it indicates that the configured health monitor is failing. The most effective troubleshooting approach is to focus on the monitor behavior and the actual traffic between BIG-IP and the pool member.
Enabling monitor logging (Option B) is a recommended first step. Monitor logging provides detailed information about why the health check is failing, such as timeouts, connection refusals, incorrect responses, or unexpected status codes. This directly correlates with BIG-IP troubleshooting best practices and allows administrators to confirm whether the failure is due to application behavior, incorrect monitor configuration, or network reachability.
Collecting a TCPdump packet capture (Option D) is also a highly effective method. A packet capture allows the administrator to verify whether the monitor probes are being sent, whether responses are received, and whether packets are being dropped, reset, or malformed. This is especially valuable when diagnosing firewall issues, SSL problems, or application-level failures.
Reviewing pool statistics (Option C) is useful for general monitoring but does not explain why a health monitor is failing. Reviewing the routing table (Option A) is typically unnecessary unless there is evidence of a broader routing issue affecting multiple destinations.

NEW QUESTION # 15
A BIG-IP Administrator disabled a virtual server with a pool that has a working health monitor. How does the status icon look for this virtual server?
  • A. Red circle
  • B. Black circle
  • C. Black square
  • D. Red square
Answer: B
Explanation:
BIG-IP status icons provide immediate visual feedback regarding the state of an object based on its availability and enabled/disabled status.
* Color (Black): The color black indicates that an object has been manually Disabled by an administrator.
* Shape (Circle): The circular shape indicates that the object is Available (i.e., its health monitors are passing).
* Scenario Result: Since the virtual server is manually disabled (Black) but its associated pool has a working health monitor that is currently passing (Circle), the resulting icon is a Black Circle.

NEW QUESTION # 16
A gateway_icmp health monitor is configured on a pool. The BIG-IP Administrator is investigating why the pool is reported as down while the server is online. Other pools with servers in the same subnet are correctly monitored.
What can cause this behavior? (Choose one answer)
  • A. The HTTP service is not started on the server.
  • B. The admin user is logged on the server.
  • C. The host-based firewall is active on the server.
  • D. The latest patches have not been installed on the server.
Answer: C
Explanation:
A gateway_icmp monitor checks basic network reachability by sending ICMP echo requests (pings) to the pool member or its gateway. If the pool is marked DOWN while the server is confirmed to be online, the most likely cause is that ICMP traffic is being blocked.
A host-based firewall active on the server (Option C) can block ICMP echo requests or replies, preventing BIG-IP from receiving a successful response to the health check. This results in the monitor failing and the pool member being marked down, even though the server and application are otherwise functioning normally. This explanation is consistent with the scenario where other servers in the same subnet work correctly, indicating that routing and BIG-IP configuration are not the issue.
The other options are unrelated to ICMP monitoring. Logged-in users (Option A), missing patches (Option B), and stopped HTTP services (Option D) do not affect a gateway_icmp monitor. BIG-IP troubleshooting best practices recommend verifying ICMP reachability and firewall policies when diagnosing ICMP-based monitor failures.

NEW QUESTION # 17
A BIG-IP Administrator configured the following virtual server to pass traffic on all addresses and ports.
After configuration is completed, the BIG-IP Administrator notices that the virtual server is unable to pass traffic.
Plaintext
ltm virtual forwarding_any_vs {
destination 0.0.0.0:any
ip-forward
mask 255.255.255.255
profiles {
fastL4 {}
}
serverssl-use-sni disabled
source 0.0.0.0/0
translate-address disabled
translate-port disabled
}
Which part of the configuration is the cause of the issue?
  • A. Incorrect translate-address configured
  • B. Incorrect destination configured
  • C. Incorrect mask 255.255.255.255
Answer: C
Explanation:
The failure of the Forwarding (IP) virtual server is caused by an incorrect Network Mask configuration for a wildcard destination.
* Wildcard Destination: The administrator intends to create a "Wildcard" Virtual Server that listens for any destination IP address (0.0.0.0).
* The Mask Conflict: A mask of 255.255.255.255 (or /32) tells the BIG-IP to look for a specific, single host address. When combined with 0.0.0.0, the system is literally looking for traffic destined for the IP
0.0.0.0, which is not a valid routable destination for standard traffic.
* Correct Configuration: To allow the virtual server to catch traffic for any IP address, the mask must be changed to 0.0.0.0 (or /0). This signifies that the system should ignore all bits of the destination address and match everything.
* Forwarding Logic: The rest of the configuration-including ip-forward (Forwarding IP type), translate-address disabled, and translate-port disabled-is correct for a BIG-IP acting as a router
/gateway.

NEW QUESTION # 18
The BIG-IP is experiencing issues with data plane resources. Which traffic processing would be most impacted?
  • A. MCPD transactions
  • B. APM sessions
  • C. iControl transactions
  • D. Configuration utility
Answer: B
Explanation:
The BIG-IP architecture is divided into two distinct planes: the Control Plane (Management) and the Data Plane (Traffic Management Microkernel - TMM).
* Data Plane (TMM): This plane is responsible for the actual processing of application traffic, including load balancing, SSL offloading, and session management for modules like APM (Access Policy Manager). If data plane resources (CPU/Memory allocated to TMM) are exhausted, active user sessions and traffic throughput are directly degraded.
* APM Sessions: Because APM sessions are managed within the TMM process to ensure high-speed access control and tunneling, they are a primary "Data Plane" function.
* Control Plane Functions: Options A, B, and D (MCPD, Configuration Utility/GUI, and iControl) all reside in the Control Plane (running on the Linux host OS). While a total system hang affects both, a specific "data plane resource issue" is designed to isolate and impact the traffic-handling services like APM while the management GUI might remain responsive.

NEW QUESTION # 19
......
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