F5 BIG-IP Administration Data Plane Configuration (F5CAB3) exam F5CAB3 Exam Dumps: Updated Questions & Answers (December 2025)

When the connection limit is reached, BIG-IP resets new connections, even if pool members are healthy.

Persistence overrides load balancing decisions by maintaining client-to-server affinity.

URI-based traffic steering requires inspection of the HTTP request. BIG-IP processes HTTP headers and URIs in theHTTP_REQUESTevent. Pool member selection based on URI must occur before the request is sent to the server, making HTTP_REQUEST the correct event.

The log message“Intercept exhaustion”indicates that the BIG-IP system has exhausted the available source port translations for one or more SNAT addresses. This occurs when too many concurrent client connections are being translated through a limited number of SNAT IP addresses, and all ephemeral source ports (typically ~64,000 per SNAT IP) are in use.

According to theBIG-IP Administration: Data Plane Configurationdocumentation:

Each SNAT IP address provides a finite number of available source ports.

When the number of concurrent connections exceeds the available port space, the BIG-IP logs anIntercept exhaustionerror and new connections fail.

The recommended resolution is toincrease the available SNAT resourcesby adding additional IP addresses to the SNAT pool.

Why the other options are incorrect:

A. Increase the timeout of the SNAT addressesIncreasing timeouts may actually worsen the problem by keeping ports allocated longer, accelerating port exhaustion.

B. Remove the SNAT pool and apply SNAT AutomapSNAT Automap uses the Self IP addresses on the egress VLAN, which may not provide additional capacity and can introduce routing or design issues. This is not a direct or recommended fix for SNAT exhaustion.

C. Remove an IP address from the SNAT poolThis would reduce the number of available source ports and further exacerbate the intercept exhaustion condition.

Correct Resolution:

Byadding an IP address to the SNAT pool, the BIG-IP increases the total number of available source ports, alleviating intercept exhaustion and restoring successful client connections.

X-Forwarded-For inserts the original client IP into HTTP headers while SNAT is enabled.

Slow Ramp Time prevents new pool members from receiving a full share of traffic immediately, allowing applications to warm up gradually.

Slow Ramp Time prevents new pool members from receiving full traffic immediately, avoiding overload.

Least Connections (node) balances connections across the physical server regardless of how many services or pool members exist on that node.

Slow Ramp Time prevents new members from being overwhelmed immediately after activation.

A red diamond indicates that the Virtual Server is enabled but unavailable, typically due to all pool members being down.