Exam F5CAB2 Topic 4 Question 12 Discussion
Actual exam question for F5's F5CAB2 exam
Question #: 12
Topic #: 4
Question #: 12
Topic #: 4
A BIG-IP Administrator needs to have a BIG-IP linked to two upstream switches for resilience of the external network. The network engineer who is going to configure the switch instructs the BIG-IP Administrator to configure interface binding with LACP. Which configuration should the administrator use?
Suggested Answer: A Vote an answer
In BIG-IP terminology, aTrunkis the object used to implement Link Aggregation (IEEE 802.3ad/802.1AX).
When a network engineer refers to "interface binding" or "EtherChannel" with LACP, the BIG-IP equivalent is a Trunk.
* LACP (Link Aggregation Control Protocol):This is a protocol that allows the BIG-IP system to communicate with the upstream switches to negotiate the bundling of multiple physical links into a single logical link.
* Resilience and Redundancy:By creating a trunk that includes interfaces connected to two different switches (typically configured as a VPC, VSS, or MLAG cluster on the switch side), the administrator ensures that the BIG-IP remains reachable even if one physical interface or one switch fails.
* Data Plane Logic:The BIG-IP treats the trunk as a single Layer 2 interface. VLANs are then associated with the trunk rather than individual physical ports.
Why the other options are incorrect:
* Option B:Trunks aggregate physical interfaces. While VLANs are associated with trunks, the trunk configuration itself does not "list" MAC addresses of the switches; it uses LACP to negotiate the connection.
* Options C & D:Virtual Servers are Layer 4-7 objects used for traffic processing and load balancing.
They do not possess "LACP profiles," nor are physical interfaces or management IPs treated as pool members for the purpose of link aggregation.
When a network engineer refers to "interface binding" or "EtherChannel" with LACP, the BIG-IP equivalent is a Trunk.
* LACP (Link Aggregation Control Protocol):This is a protocol that allows the BIG-IP system to communicate with the upstream switches to negotiate the bundling of multiple physical links into a single logical link.
* Resilience and Redundancy:By creating a trunk that includes interfaces connected to two different switches (typically configured as a VPC, VSS, or MLAG cluster on the switch side), the administrator ensures that the BIG-IP remains reachable even if one physical interface or one switch fails.
* Data Plane Logic:The BIG-IP treats the trunk as a single Layer 2 interface. VLANs are then associated with the trunk rather than individual physical ports.
Why the other options are incorrect:
* Option B:Trunks aggregate physical interfaces. While VLANs are associated with trunks, the trunk configuration itself does not "list" MAC addresses of the switches; it uses LACP to negotiate the connection.
* Options C & D:Virtual Servers are Layer 4-7 objects used for traffic processing and load balancing.
They do not possess "LACP profiles," nor are physical interfaces or management IPs treated as pool members for the purpose of link aggregation.
by Solomon at Feb 16, 2026, 10:46 PM
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