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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | BIG-IP Administration Support and Troubleshooting (F5CAB5) |
| Exam Number: | F5CAB5 |
| Exam Duration: | 30 minutes |
| Passing Score: | 245 |
| Related Certifications: | BIG-IP Administration Install, Initial Configuration, and Upgrade BIG-IP Administration Data Plane Configuration BIG-IP Administration Data Plane Concepts BIG-IP Administration Control Plane Administration |
| Exam Price: | USD 50 (online) / USD 65 (test center) |
| Exam Format: | Multiple Choice |
| Available Languages: | English |
| Real Exam Qty: | 25-30 |
| Recommended Training: | Troubleshooting BIG-IP Training Administering BIG-IP Course |
| Exam Registration: | F5 Certification Portal F5 Education Exam Page |
| 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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NEW QUESTION # 45
A BIG-IP Administrator makes a configuration change to the BIG-IP device. Which file logs the message regarding the configuration change?
Answer: B
Explanation:
The BIG-IP system uses the audit log to track administrative actions and configuration changes.
Audit Logging Functionality: When a user modifies the configuration via the Configuration Utility (GUI), the Traffic Management Shell (tmsh), or iControl, the system records the event in the audit log. This includes the name of the user who made the change, the timestamp, and the specific command or object that was modified.
Log Location: The audit log is stored at /var/log/audit.
NEW QUESTION # 46
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,B
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.
NEW QUESTION # 47
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: C
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 # 48
Which two methods should the BIG-IP Administrator troubleshoot a Pool-member that's been marked "DOWN" by its Health Monitor? (Pick the 2 correct responses below)
Answer: B,D
Explanation:
When a health monitor marks a member "Down," the goal is to determine if the issue is at the network level or the application level.
Monitor Logging (Option A): In the Pool Member configuration, an administrator can enable "Monitor Logging". This generates a detailed text file in /var/log/monitors/ that shows the exact "Send" string sent by the BIG-IP and the exact "Receive" string (or lack thereof) returned by the server.
TCPdump (Option C): This is the most definitive way to see if the monitor traffic is even leaving the BIG-IP and if the server is responding with a TCP RST (reset) or an ICMP unreachable message. A command such as tcpdump -ni <vlan> host <member_ip> and port <member_port> is standard for this task.
Why not others? While the routing table (Option B) is useful for general connectivity, if other members in the same subnet are "Up," the routing is likely fine. Statistics (Option D) show that it is down but rarely why it is down at a protocol level.
NEW QUESTION # 49
A BIG-IP Administrator uses backend servers to host multiple services per server. There are multiple virtual servers and pools defined, referencing the same backend servers. Which load balancing algorithm is most appropriate to have an equal number of connections on each backend server?17
Answer: A
Explanation:
When load balancing is not working as 23expected and connections appear skewed across physical hardware, the administrator must distinguish between "member"24 and "node" level balancing. A "member" refers to a specific IP and Port combination (e.g., 10.1.1.1:80), whereas a "node" refers to the underlying IP address (10.1.1.1) regardless of the port25. If a single server hosts multiple services (Web, FTP, API) across different pools, using "Least Connections (member)" would only balance connections within each individual pool26. This could lead to a scenario where one server is overwhelmed because it is winning the "least connections" count in three different pools simultaneously. By selecting "Least Connections (node)," the BIG-IP tracks the total number of concurrent connections to the physical IP address across all pools it belongs to27. This ensures that the administrator can maintain an equal distribution of work across the hardware, preventing performance degradation on backend servers that host multiple application services.
NEW QUESTION # 50
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