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| Certification Vendor: | F5 Networks |
|---|---|
| Exam Name: | F5 Certified BIG-IP Administrator: Data Plane Configuration |
| Exam Number: | F5CAB3 |
| Passing Score: | 247 out of 350 (approximately 70%) |
| Exam Duration: | 120 minutes |
| Exam Format: | Build List, Multiple Select, Multiple Choice |
| Available Languages: | English |
| Exam Price: | $160 USD |
| Related Certifications: | F5 Certified BIG-IP Administrator (F5-CA) F5 Certified Specialist, Data Plane Configuration |
| Certificate Validity Period: | 2 years |
| Real Exam Qty: | 60-80 |
| Sample Questions: | F5 F5CAB3 Sample Questions |
| Exam Way: | Online proctored or test center |
| Pre Condition: | Recommended: F5 Certified Administrator certification or equivalent experience with BIG-IP LTM |
| Official Syllabus URL: | https://www.f5.com/go/certification |
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NEW QUESTION # 11
A BIG-IP Administrator creates a new Virtual Server. The end user is unable to access the page. During troubleshooting, the administrator learns that the connection between the BIG-IP system and server is NOT set up correctly. What should the administrator do to solve this issue? (Choose one answer)
Answer: A
Explanation:
The issue described is a classic symptom of asymmetric routing, which frequently occurs when the BIG-IP system and the back-end servers reside on the same subnet (often referred to as a "one-arm" deployment).
* The Routing Problem: By default, the BIG-IP system preserves the original client source IP address when forwarding traffic to a pool member. If the server is in the same subnet as the client or if the server's default gateway is not the BIG-IP, the server will attempt to send its response directly back to the client's IP address, bypassing the BIG-IP.
* Stateful Failure: Since the BIG-IP is a Full Proxy, it maintains a state table. Because the response packet never returns through the BIG-IP, the system cannot complete the three-way handshake or manage the application session, resulting in a connection failure for the user.
* The Solution (SNAT): Enabling Source Network Address Translation (SNAT) solves this by changing the source IP address of the request to an IP address owned by the BIG-IP (typically a self-IP).
* Requirement for Subnet Alignment: To ensure the server sends the response back to the BIG-IP, the translation address must be reachable. By using a self-IP configured in the same subnet as the servers, the BIG-IP ensures that the server sees the request coming from a local "neighbor." The server will then naturally send the response back to that self-IP, allowing the BIG-IP to translate the packet back and forward it to the client.
Why other options are incorrect:
* A: Disabling address translation would ensure the server-side traffic uses the client IP, making asymmetric routing inevitable in this scenario.
* B: This is technically contradictory; "Auto Map" specifically uses existing self-IPs and does not require or use a "SNAT pool" configuration.
* C: While using a specific translation address can work, it does not inherently guarantee the Layer 2
/Layer 3 reachability mentioned in the scenario as effectively as ensuring the self-IP is correctly placed in the server's subnet.
NEW QUESTION # 12
What would be the best persistence method for F5 to load balance traffic from clients via a single source IP (NAT) to multiple pool members with even distribution for an HTTPS web application?
Answer: D
Explanation:
When clients connect through a single source IP (NAT) - such as a corporate proxy or carrier-grade NAT
- Source Address Affinity persistence becomes entirely ineffective because all clients share an identical source IP address. This would force every client session to the same pool member, completely eliminating even distribution and defeating the purpose of load balancing.
Cookie Persistence is the optimal solution in this scenario because it operates at Layer 7 , inserting a unique cookie into each client ' s HTTP/HTTPS response. Each individual browser session carries its own distinct cookie value, allowing the BIG-IP to identify and persist individual clients to specific pool members - regardless of whether they share a common source IP address. This guarantees both session persistence and even load distribution across pool members.
The remaining options are unsuitable because:
* Destination Address Affinity persists based on destination IP, irrelevant for client-to-server session stickiness.
* SSL Persistence uses the SSL Session ID for persistence, but SSL session IDs are frequently renegotiated and are unreliable for long-term persistence across modern TLS implementations.
* Source Address Affinity fails entirely under NAT conditions as described.
Cookie persistence is the industry-standard method for HTTPS application load balancing requiring per-client session affinity.
Reference: BIG-IP Administration - Data Plane Configuration, Module: Persistence Methods - Cookie, Source Address, and SSL Persistence.
NEW QUESTION # 13
The BIG-IP Administrator needs to load balance a pool of web servers. Load balancing should consider the number of connections that are active on that pool member.
Which load balancing method meets this requirement? (Choose one answer)
Answer: B
Explanation:
The requirement states that load balancing decisions must be based on the number of active connections on each pool member. This directly maps to the Least Connections (member) load balancing method.
According to the BIG-IP Administration: Data Plane Configuration documentation:
Least Connections (member) selects the pool member with the fewest active connections at the time of the request.
This method dynamically adapts to real-time traffic patterns and ensures that more heavily loaded pool members receive fewer new connections.
It is especially effective for web servers where connection duration may vary and equal distribution of active sessions is desired.
Why the other options are incorrect:
B . Round Robin
Distributes connections sequentially without considering current load or active connections.
C . Ratio (member)
Distributes traffic based on static ratios, not real-time connection counts.
D . Ratio (node)
Uses predefined ratios at the node level and does not account for active connection counts.
Correct Resolution:
Using Least Connections (member) ensures that new connections are directed to the pool member currently handling the fewest active connections, meeting the stated requirement.
NEW QUESTION # 14
Refer to the exhibit.
A BIG-IP Administrator needs to configure health monitors for a newly configured server pool named Pool_B.
Which health monitor settings will ensure that all pool members will be accurately marked as available or unavailable? (Choose one answer)
Answer: A
Explanation:
From the exhibit, the pool contains different applications on different service ports (for example, HTTP/80, FTP/21, HTTPS/443, SSH/22). To mark pool members correctly, BIG-IP must be able to verify the actual service running on each member's port.
In BIG-IP Administration: Data Plane Configuration, monitor behavior is described as follows:
When multiple monitors are assigned to a pool, the Availability Requirement controls how monitor results are evaluated:
At least one = the pool member is marked up if any one of the assigned monitors succeeds.
All = the pool member is marked up only if every assigned monitor succeeds.
For pools containing members with different services/ports, using All can incorrectly mark members down because monitors intended for other services will fail on the wrong port.
Why C is correct:
Assigning HTTPS, HTTP, FTP, and SSH covers the actual services shown in the pool.
Setting the Availability Requirement to at least one ensures that each pool member is considered available when its appropriate service monitor succeeds, without being forced to pass unrelated service monitors.
Why the other options are incorrect:
A / D (Availability Requirement = all): would cause members to be marked down when unrelated monitors fail (e.g., SSH monitor against an HTTP member).
B (includes ICMP): ICMP can indicate the host is reachable even if the application service is down, which does not "accurately" reflect service availability.
Therefore, the best choice is HTTPS, HTTP, FTP, and SSH with Availability Requirement of at least one health monitor.
NEW QUESTION # 15
A BIG-IP Administrator creates a new VLAN on BIG-IP Cluster Member A and attaches an interface to it.
Although the Auto Config Sync is in place, the new VLAN does NOT show up on Cluster Member B. What should the BIG-IP Administrator do to ensure the new VLAN is configured on each Cluster Member?
Answer: A
Explanation:
In a BIG-IP High Availability (HA) environment, most configuration objects (Virtual Servers, Pools, iRules) are considered " shared " and are synchronized automatically between devices. However, network-level objects-specifically VLANs and Self IPs-are unique to the hardware and are generally not synchronized by the ConfigSync process.
This is intentional because two devices in a cluster may have different physical cabling or interface assignments. For example, Cluster Member A might use interface 1.1 for a specific VLAN, while Cluster Member B might use interface 1.2. Because the BIG-IP system cannot assume that the physical network topology is identical for both appliances, the administrator must Configure the new VLAN manually on Cluster Member B.
Once the VLAN is created manually on both devices with the exact same name, it can then be used to host " shared " floating Self IP addresses or traffic groups that will synchronize. Failing to create the VLAN on the peer device will prevent the traffic group from failing over correctly, as the peer will not have the necessary Layer 2 broadcast domain defined to take over the traffic. Resetting Device Trust (Option D) is a drastic step for fix sync communication issues but will not change the fact that VLANs are non-syncable objects.
Enabling the interface (Option B) only affects the link status of Member A and has no impact on the configuration of Member B.
NEW QUESTION # 16
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