View all questions & answers for the BIG-IP Administration Data Plane Configuration (F5CAB3) exam
BIG-IP Administration Data Plane Configuration (F5CAB3) - Question #42 Discussion
Community Explanations & Comments (4)
Payton K
9 months ago
Selected: D
This issue indicates a server-side connectivity problem, most commonly caused by asymmetric routing:
The BIG-IP forwards the client request to the server
The server responds directly to the client, bypassing the BIG-IP
The connection fails because return traffic does not pass back through the BIG-IP
Why SNAT with a self-IP fixes it
Enabling SNAT causes the BIG-IP to translate the source address of server-side traffic
The server sees the request as coming from a BIG-IP self-IP
The server replies back to the BIG-IP
The BIG-IP then forwards the response to the client correctly
A self-IP in the same subnet as the servers ensures proper Layer 2/Layer 3 reachability.
Why the other options are incorrect
A. Disable Address Translation ❌
This makes asymmetric routing more likely, not less.
B. Set Address Translation to Auto Map, configure a SNAT pool, and have pool members in the same subnet ❌
Auto Map uses self-IPs automatically; configuring a SNAT pool is unnecessary and incorrect in this context.
C. Set Address Translation to SNAT and configure a specific translation address ❌
Possible, but the question specifically points to fixing connectivity using proper BIG-IP configuration. The expected exam answer is SNAT using self-IPs.
Exam takeaway
Server connection issues after creating a Virtual Server → enable SNAT using a self-IP
The BIG-IP forwards the client request to the server
The server responds directly to the client, bypassing the BIG-IP
The connection fails because return traffic does not pass back through the BIG-IP
Why SNAT with a self-IP fixes it
Enabling SNAT causes the BIG-IP to translate the source address of server-side traffic
The server sees the request as coming from a BIG-IP self-IP
The server replies back to the BIG-IP
The BIG-IP then forwards the response to the client correctly
A self-IP in the same subnet as the servers ensures proper Layer 2/Layer 3 reachability.
Why the other options are incorrect
A. Disable Address Translation ❌
This makes asymmetric routing more likely, not less.
B. Set Address Translation to Auto Map, configure a SNAT pool, and have pool members in the same subnet ❌
Auto Map uses self-IPs automatically; configuring a SNAT pool is unnecessary and incorrect in this context.
C. Set Address Translation to SNAT and configure a specific translation address ❌
Possible, but the question specifically points to fixing connectivity using proper BIG-IP configuration. The expected exam answer is SNAT using self-IPs.
Exam takeaway
Server connection issues after creating a Virtual Server → enable SNAT using a self-IP
Anonymous User
9 months ago
Selected: D
correct answer
Anonymous User
8 months ago
Selected: D
D. Set Address Translation to SNAT and have self-IP configured in the same subnet of servers
When the BIG-IP system cannot properly communicate with the backend servers (the server-side connection is broken), SNAT is needed so the servers can route return traffic back to the BIG-IP. The self-IP must be in the same subnet as the pool members so the servers know where to send their responses.
When the BIG-IP system cannot properly communicate with the backend servers (the server-side connection is broken), SNAT is needed so the servers can route return traffic back to the BIG-IP. The self-IP must be in the same subnet as the pool members so the servers know where to send their responses.
Anonymous User
2 months ago
Selected: D
D is the correct one.
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)
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