F5CAB2 Practice Questions

The primary distinction between Activ41e and Standby units revolves around which unit is currently processing traffic.

Traffic Objects (C & E):The unit in the43Activestate is the only one that answers ARP requests forVirtual Server addressesandFloating Self-IPs. The Standby unit remains "quiet" for these addresses to avoid IP conflicts on the network.

Monitors (A - False):Boththe Active and Standby units perform health monitors on pool members by default. This ensures that the Standby unit is ready to take over with an up-to-date view of the pool's health.

Failover (B - False):A failover trigger (like a VLAN fail-safe) causes the Active unit to go Standby and the Standby unit to go Active; it affects both.

Management (D - False):Configuration changes can technically be made on either unit (though it is best practice to make them on the Active unit) and then synchronized to the peer.

12

In the BIG-IP system, pool selection must occur on theclient-sideof the connection, before the system attempts to connect to a pool3member. The events listed4are the primary entry points for making these decisions:

CLIENT_ACCEPTED (E):This is a Layer 4 event triggered when the BIG-IP accepts a TCP connection. It is the earliest point where a pool can be assigned based on the client's source IP address or the destination port.

CLIENT_DATA (A):This event is triggered when the system receives a "chunk" of data on the client-side. It is often used for non-HTTP protocols (like custom TCP protocols) to inspect the payload and select a pool based on its contents.

HTTP_REQUEST (C):This is a Layer 7 event. It occurs once the BIG-IP has fully parsed the HTTP headers. This is the most common event for pool selection, allowing the administrator to route traffic based on the URI, Host header, or cookies.

Events like SERVER_SELECTED or SERVER_CONNECTED occurafterthe load balancing decision has already been made, and HTTP_RESPONSE or SERVER_DATA occur after the server has already started communicating back, making them too late for initial pool selection.