Pass Guaranteed 2026 F5 Marvelous F5CAB5: BIG-IP Administration Support and Troubleshooting Latest Test Questions

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F5 F5CAB5 Exam Syllabus Topics:

SectionObjectives
Topic 1: BIG-IP Operations and Support Fundamentals- System resource utilization analysis
- Interpreting system health and statistics
Topic 2: Network Performance Issue Identification- Identifying network-level performance bottlenecks
- Analyzing traffic flow issues
Topic 3: Diagnostics and Root Cause Analysis- Log interpretation and troubleshooting methods
- Basic BIG-IP diagnostic workflows
Topic 4: Traffic Flow and Load Balancing Troubleshooting- Virtual server and pool troubleshooting
- Load balancing behavior validation

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F5 BIG-IP Administration Support and Troubleshooting Sample Questions (Q46-Q51):

NEW QUESTION # 46
Refer to the exhibit.

A BIG-IP Administrator needs to deploy an application on the BIG-IP system to perform SSL offload and re-encrypt the traffic to pool members. During testing, users are unable to connect to the application.
What must the BIG-IP Administrator do to resolve the issue? (Choose one answer)

Answer: A

Explanation:
To successfully perform SSL offload and re-encryption on a BIG-IP system, the virtual server must be configured with both a Client SSL profile and a Server SSL profile. The Client SSL profile enables BIG-IP to decrypt inbound HTTPS traffic from clients, while the Server SSL profile is required to re-encrypt traffic before forwarding it to the pool members.
From the exhibit, the virtual server has a Client SSL profile configured, which allows BIG-IP to accept HTTPS connections from clients. However, there is no Server SSL profile attached, meaning BIG-IP attempts to send unencrypted HTTP traffic to pool members listening on HTTPS (port 443). This protocol mismatch causes the server-side SSL handshake to fail, resulting in users being unable to connect to the application.
This behavior is well documented in BIG-IP SSL troubleshooting guides: when backend servers expect HTTPS, a Server SSL profile is mandatory to establish a secure connection from BIG-IP to the pool members.
The other options are incorrect:
Removing the Client SSL profile (Option A) would break client-side HTTPS.
The server-side TCP profile (Option B) is unrelated to SSL encryption.
Forward Proxy (Option C) is only used for outbound SSL inspection scenarios.
Therefore, configuring an SSL Profile (Server) is the correct and required solution.


NEW QUESTION # 47
Refer to the exhibit.

The image shows the status of a virtual server namedapplication_vsin the BIG-IP Configuration Utility.
What is the cause of the status shown? (Choose two answers)

Answer: A,D

Explanation:
The exhibit shows the virtual serverapplication_vswith a status indicating it isoffline but enabled. In BIG-IP terminology, this status means the virtual server itself is administratively enabled, but it is unable to pass traffic becauseno usable pool members are available.
Two common and documented causes for this condition are:
* Pool member(s) administratively disabled (Option A):When all pool members are administratively disabled, BIG-IP removes them from load-balancing decisions. Even though the virtual server remains enabled, it has no available pool members to send traffic to, resulting in an offline status.
* Node(s) administratively disabled (Option C):Pool members inherit the status of their parent nodes. If a node is administratively disabled, all associated pool members are also marked unavailable. This condition causes the virtual server to show as offline, even though the virtual server configuration itself is correct.
The other options are incorrect:
* Forced offline pool members (Option B)result in a different operational intent and are explicitly set for maintenance scenarios.
* Virtual server administratively disabled (Option D)would show the virtual server as disabled, not enabled/offline.
This behavior is consistent with BIG-IP traffic management logic and is commonly verified by reviewingpool and node availability stateswhen diagnosing virtual server availability issues.


NEW QUESTION # 48
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?

Answer: B

Explanation:
Comprehensive and Detailed Explanation From BIG-IP Administration Support and Troubleshooting documents: 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.


NEW QUESTION # 49
A BIG-IP Administrator suspects that one of the BIG-IP device power supplies is experiencing power outages. Which log file should the BIG-IP Administrator check to verify the suspicion?

Answer: D

Explanation:
On a BIG-IP system, hardware-related alerts, including those for power supply units (PSUs), fans, and chassis components, are primarily logged in the Local Traffic Manager (LTM) log file.
Log Location: The file path is /var/log/ltm.
PSU Alert Messages: When a power supply fails, experiences an outage, or is unplugged, the chmand (Chassis Manager) or system_check processes log specific error codes to this file. For example, you may see messages like 010d0006:0: Chassis power supply <X> has experienced an issue or VINPUT=bad.
Troubleshooting: Administrators can use the command grep -i "power supply" /var/log/ltm to quickly filter for PSU-related events.


NEW QUESTION # 50
A BIG-IP Administrator needs to collect HTTP status code and HTTP method for traffic flowing through a virtual server.
Which default profile provides this information? (Choose one answer)

Answer: D

Explanation:
To collect application-layer details such asHTTP status codes(200, 404, 500, etc.) andHTTP methods(GET, POST, PUT, DELETE), the BIG-IP system must use a profile designed for traffic visibility and reporting rather than basic traffic handling. TheAnalytics profile (Option C)is the correct choice because it is specifically designed to collect, store, and present detailed statistics about HTTP and TCP traffic passing through a virtual server.
When an Analytics profile is attached to a virtual server, BIG-IP can record metrics such as HTTP response codes, request methods, URI paths, latency, throughput, and client-side/server-side performance data. These statistics are then accessible through the BIG-IP GUI underStatistics # Analytics, allowing administrators to validate application behavior and troubleshoot performance or functional issues.
TheHTTP profile (Option B)enables HTTP protocol awareness and features like header insertion and compression, but it does not provide historical or statistical reporting of HTTP methods and response codes.
Request Adapt (Option A)is used for ICAP-based content adaptation, not visibility.Statistics (Option D)is not a standalone profile and does not provide HTTP-level insight.
Therefore, the Analytics profile is the only default profile that fulfills this requirement.


NEW QUESTION # 51
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