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| Certification Vendor: | F5 Networks |
|---|---|
| Exam Name: | F5 BIG-IP Administration, Support and Troubleshooting |
| Exam Number: | F5CAB5 |
| Real Exam Qty: | 65 - 75 |
| Certificate Validity Period: | 2 years |
| Passing Score: | Approx. 70% |
| Exam Format: | Drag and drop, Multiple choice, Simulation-based items |
| Exam Price: | $150 USD |
| Related Certifications: | F5 Certified Solution Expert F5 Certified BIG-IP Professional |
| Available Languages: | English |
| Exam Duration: | 90 minutes |
| Recommended Training: | F5 Troubleshooting BIG-IP (TRB) Course F5 Administering BIG-IP (ADM) Course |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | F5 F5CAB5 Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE test centers |
| Pre Condition: | Recommended: Basic networking knowledge, experience with F5 BIG-IP administration, completion of F5 Administering BIG-IP (ADM) training |
| Official Syllabus URL: | https://www.f5.com/services/training-certification/certification/exams/f5cab5 |
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NEW QUESTION # 14
Clients report that they cannot reach the virtual server vs-production on port 80, but are able to ping the virtual server address. The configuration is shown below:
Plaintext
ltm virtual vs-production {
destination 10.99.20.50:http
ip-protocol tcp
mask 255.255.255.255
profiles {
http {}
tcp {}
}
source 192.168.0.0/16
translate-address enabled
translate-port enabled
vlans {
external
}
vlans-enabled
}
What is the cause?
Answer: C
Explanation:
The issue is caused by the Source Address restriction configured on the virtual server.
* Source Filter: The configuration contains the line source 192.168.0.0/16. This acts as an implicit Access Control List (ACL). The virtual server will only accept and process TCP connections if the client's source IP address falls within the 192.168.x.x range.
* Why Ping Works: ICMP (Ping) is handled by the Virtual Address object, not the Virtual Server object. Unless ICMP is specifically disabled on the Virtual Address, it will respond to pings from any subnet, even if the Virtual Server itself is restricted by a source filter or is even disabled.
* Evaluation of Other Options:
* Disabled (Option A): If the VS were disabled, the configuration would typically show disabled or state down, and the symptoms would be similar, but the source filter is a more specific
"misconfiguration" in this context.
* Port 80 (Option C): The configuration destination 10.99.20.50:http explicitly confirms it is listening on port 80.
* Unallowed Subnet: If a client from a different network (e.g., 10.10.1.5) tries to connect, the BIG- IP will silently drop the connection or send a reset because it does not match the defined source criteria.
NEW QUESTION # 15
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: C
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 # 16
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 # 17
A custom HTTP monitor is failing to a pool member 10.10.3.75:8080 that serves up www.example.com. A ping works to the pool member address. The SEND string is: GET / HTTP/1.1 \r\nHost: www.example.com\r\nConnection: Close\r\n\r\n. Which CLI tool syntax will show whether the web server returns the correct HTTP response?
Answer: D
Explanation:
To manually verify a health monitor's "Send String" from the BIG-IP command line, the curl utility is the preferred tool because it allows for custom header insertion.
Matching the Monitor String: The monitor string requires an HTTP/1.1 request which must include a "Host" header. Option A correctly uses the --header (or -H) flag to pass Host: www.example.com to the specific IP and port of the pool member.
Troubleshooting Logic: If curl --header 'Host: www.example.com' 'http://10.10.3.75:8080/' returns a "200 OK" but the BIG-IP monitor still shows "Down," the administrator should check if the Receive String in the monitor configuration matches the output provided by curl.
Invalid Syntax: Option D is incorrect because it tries to append the hostname to the URI path, which the web server will likely reject with a "404 Not Found". tracepath (Options B and C) is a path discovery tool similar to traceroute and cannot validate HTTP response content.
NEW QUESTION # 18
A BIG-IP Administrator observes the following messages in the /var/log/ltm log:
warning tmm[pid]: 011e0002: sweeper_segment_cb_any: Aggressive mode
/Common/default- eviction-policy activated (0) (global memory)
(345209/690176 pages)
warning tmm[pid]: 011e0003: Aggressive mode sweeper /Common/default-
eviction-policy (0) (global memory) 1 connections killed
warning tmm[pid]: 011e0003: Aggressive mode sweeper /Common/default-
eviction-policy (0) (global memory) 1 connections killed
warning tmm[pid]: 011e0003: Aggressive mode sweeper /Common/default-
eviction-policy (0) (global memory) 1 connections killed
What is happening when the BIG-IP Administrator sees the messages displayed above? (Choose two answers)
Answer: A,B
Explanation:
These log messages indicate that the BIG-IP system's Traffic Management Microkernel (TMM) has enteredaggressive eviction modedue tohigh global memory utilization. When TMM memory consumption reaches critical thresholds, BIG-IP activates thedefault eviction policyto protect system stability and prevent a full traffic processing failure. This condition directly corresponds to Option A, where the global eviction policy is triggered because TMM memory resources are nearing exhaustion.
Once aggressive mode is activated, BIG-IP begins using theconnection sweeper mechanism, which selectively terminates existing connections to free memory. The repeated log entries stating" connections killed"confirm that the system isreaping some connections, not all connections. This behavior matches Option C. The eviction process is incremental and controlled, targeting idle, low- priority, or least-recently-used connections first to minimize impact on active traffic.
NEW QUESTION # 19
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