F5 Networks F5CAB3 Exam - Topic 1 Question 5 Discussion

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 decisions by forcing subsequent connections from a client to be sent to the same pool member.

According to the BIG-IP Administration: Data Plane Configuration documentation:

Persistence creates a client-to-server mapping that 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 profile

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

B . Enabling SNAT automap

SNAT affects source address translation, not pool member selection.

C . Enabling a fallback host in the HTTP profile

A fallback host is only used when no pool members are available.

Correct Resolution:

Adding a persistence profile alters load balancing behavior by maintaining client affinity to a specific pool member.