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| Certification Vendor: | F5 |
|---|---|
| Exam Name: | F5 BIG-IP Administration Data Plane Configuration (F5CAB3) |
| Exam Number: | F5CAB3 |
| Related Certifications: | F5 Certified BIG-IP Administrator |
| Certificate Validity Period: | 2 years |
| Available Languages: | English |
| Exam Format: | Multiple choice |
| Recommended Training: | F5 Learning Portal F5 BIG-IP Administration Training |
| Exam Registration: | Pearson VUE F5 Exams F5 Certification Portal |
| Sample Questions: | F5 F5CAB3 Sample Questions |
| Exam Way: | Online proctored exam via Pearson VUE or authorized testing centers |
| Pre Condition: | Recommended foundational knowledge of networking concepts (TCP/IP, routing, load balancing). |
| Official Syllabus URL: | https://www.f5.com/services/training-certification/certification |
>> Valid F5CAB3 Exam Questions <<
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NEW QUESTION # 12
Users are unable to reach an application. The Virtual Server shows a red diamond status.
What is the cause?
Answer: A
Explanation:
A red diamond indicates that the Virtual Server is enabled but unavailable, typically due to all pool members being down.
NEW QUESTION # 13
Refer to the exhibit.
DNS queries from two internal DNS servers are being load-balanced to external DNS servers via a virtual server on a BIG-IP device. The DNS queries originate from:
192.168.10.100
192.168.10.200
and target:
192.168.2.150
All DNS queries destined for the external DNS servers fail.
Which property change should the BIG-IP Administrator make in the Virtual Server to resolve this issue?
(Choose one answer)
Answer: A
Explanation:
DNS traffic is primarily transported using UDP port 53. In the exhibit, the Virtual Server is configured with the Protocol set to TCP, which prevents standard DNS queries from being processed correctly. BIG-IP Virtual Servers must be configured with the correct Layer 4 protocol to match the application traffic they are handling.
According to the BIG-IP Administration: Data Plane Configuration documentation:
* The Protocol setting on a Virtual Server defines whether traffic is processed as TCP, UDP, or another supported transport protocol.
* Standard DNS queries and responses use UDP, while TCP is only required for DNS zone transfers (AXFR) or exceptionally large responses.
* When a DNS Virtual Server is incorrectly configured with TCP, UDP-based DNS queries are dropped, causing all requests to fail.
Why the other options are incorrect:
* A. Protocol profile (Client) to DNS_OPTIMIZEDA DNS profile enhances DNS functionality but does not correct an incorrect transport protocol configuration.
* B. Type to Performance (HTTP)Performance (HTTP) Virtual Servers are designed for HTTP traffic and are not suitable for DNS services.
* C. Source Address to 192.168.10.0/24The existing source IPs already fall within the allowed range, so this setting does not address the failure.
Correct Resolution:
Changing the Protocol to UDP aligns the Virtual Server with standard DNS transport requirements, allowing DNS queries to be successfully processed and load-balanced.
NEW QUESTION # 14
In a pool there are 2 pool members out of the 5 members that are older servers. The number of connections these can handle is less than the other 3 pool members. Which load balancing method would allow more traffic to be directed to the newer servers? (Choose one answer)
Answer: A
Explanation:
When a pool contains servers with heterogeneous hardware capabilities (differing CPU, RAM, or connection limits), a static load balancing method like Round Robin is ineffective because it distributes requests equally, regardless of the server's capacity. To optimize traffic distribution for newer, more powerful servers, a dynamic or weighted method is required.
Weighted Least Connections (member): This is the ideal method for this scenario. It combines two factors:
Least Connections: It first checks the current active connection count to ensure traffic goes to the least busy server.
Weight (Ratio): It allows the administrator to assign a "Ratio" value to each pool member. Newer servers can be assigned a higher ratio (e.g., 3) while older servers are assigned a lower ratio (e.g., 1). The BIG-IP system uses these weights to disproportionately favor the newer servers even when connection counts are similar.
Why other options are incorrect:
Global Availability: This is primarily a GSLB (Global Server Load Balancing) or specific LTM priority group concept where traffic is sent to the first available member in a list until it fails, then moves to the next. It does not load balance based on capacity.
Round Robin: This passes each new connection request to the next server in line, treating the old and new servers exactly the same.
Least Connections (member): While this sends traffic to the server with the fewest active connections, it assumes all servers are equal. If an old server and a new server both have 10 connections, they are treated as equally capable of taking the 11th, which is not true in this scenario.
NEW QUESTION # 15
A node is a member of multiple pools hosting different web applications. If one application fails, only that pool member should be marked down.
What should be configured?
Answer: A
Explanation:
Application-specific health checks must validate application responses, which requires HTTP monitors with custom send/receive strings.
NEW QUESTION # 16
What is the status of a pool member when manual resume is enabled and a health check first fails and then passes?
Answer: C
Explanation:
With manual resume enabled, BIG-IP does not automatically return a pool member to service after recovery. The member remains offline until manually re-enabled.
NEW QUESTION # 17
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