F5CAB3 Dumps With Exact Questions and Answers

By default, BIG-IP load balancing algorithms (such as Round Robin) distribute connections evenly across all available pool members. However,persistence profiles override normal load balancing decisionsby forcing subsequent connections from a client to be sent to the same pool member.

According to theBIG-IP Administration: Data Plane Configurationdocumentation:

Persistence creates aclient-to-server mappingthat is honored before load balancing algorithms are applied.

When persistence is enabled, BIG-IP may repeatedly select the same pool member even if others are available.

This directly alters load balancing behavior.

Why the other options are incorrect:

A. Adding a OneConnect profileOneConnect optimizes server-side TCP connections but does not change which pool member is selected.

B. Enabling SNAT automapSNAT affects source address translation, not pool member selection.

C. Enabling a fallback host in the HTTP profileA fallback host is only used when no pool members are available.

Correct Resolution:

Adding apersistence profilealters load balancing behavior by maintaining client affinity to a specific pool member.

Using “at least one” ensures each member is marked up based on its relevant service monitor.

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.