Exam F5CAB2 Topic 1 Question 54 Discussion

This question tests understanding ofPriority Group Activation (PGA)and how BIG-IP determines which pool members are eligible to receive traffic.
Key BIG-IP Priority Group Concepts:
* Higher priority group numbers = higher priority
* BIG-IP willonly send traffic to the highest priority groupthat meets thePriority Group Activation condition
* Lower priority groups areactivated only when the condition is met
* Onlyavailable (green)members count toward the activation threshold
Configuration from the Exhibit:
* Priority Group Activation:Less than 2 available members
* Pool Members and Status:
Pool Member
Priority Group
Status
serv1
2
Active (available)
serv2
2
Inactive (down)
serv3
1
Active (available)
serv4
1
Active (available)
Step-by-Step Traffic Decision:
* BIG-IP first evaluates thehighest priority group (Priority Group 2)
* Priority Group 2 has:
* serv1 # available
* serv2 # unavailable
* Total available members = 1
* Activation rule isLess than 2 available members
* Condition istrue(1 < 2)
* BIG-IPactivates the next lower priority group (Priority Group 1)
* Traffic is now sent to:
* serv1 (Priority Group 2)
* serv3 and serv4 (Priority Group 1)
Final Result:
Traffic is distributed toserv1, serv3, and serv4
Why the Other Options Are Incorrect:
* A- Ignores activation of the lower priority group
* B- serv4 is also active and eligible
* C- serv2 is down and cannot receive traffic
Key Data Plane Concept Reinforced:
Priority Group Activation controls when lower-priority pool members are allowed to receive traffic, based strictly on the number ofavailable membersin the higher-priority group. In this case, the failure of one high-priority member caused BIG-IP toexpand traffic distributionto lower-priority members to maintain availability.