and their status/statistics] The network architecture for a BIG-IP consists of an external VLAN and an internal VLAN with two interfaces connected to…

To achieve fault tolerance with two physical interfaces, they must be aggregated into a single logical link, known as a trunk. Enabling Link Aggregation Control Protocol (LACP) on the trunk allows the BIG-IP system to dynamically negotiate with the upstream switch, providing robust link failure detection and redundancy. To transport traffic for two distinct VLANs (external and internal) over this single logical trunk, the traffic for each VLAN must be identifiable. This is accomplished using IEEE 802.1Q VLAN tagging, where each frame is tagged with the ID of the VLAN to which it belongs. This configuration correctly provides both fault tolerance and multi-VLAN support.

A. A single link or trunk can only have one untagged (native) VLAN; configuring both VLANs as untagged is an invalid configuration.

B. Creating two separate trunks is not a valid or efficient design with only two physical interfaces, as a trunk requires member interfaces for aggregation.

C. This option is invalid as two trunks cannot be created from only two interfaces, and this design does not correctly implement multi-VLAN transport.

1. F5 Networks, BIG-IP TMOS: Implementations, v17.1.0, Chapter: Working with VLANs and Trunks.

Section: About trunks: "A trunk is a combination of two or more interfaces and is used to increase bandwidth and provide redundancy." This supports the use of a trunk for fault tolerance.

Section: About VLANs: "When you configure a trunk on the BIG-IP system, you can associate the trunk with one or more VLANs. When you associate a trunk with more than one VLAN, the BIG-IP system tags the frames that it sends on that trunk." This directly confirms that a trunk with multiple VLANs requires tagging.

2. F5 Networks Knowledge Base, K6133: VLAN-tagged and untagged traffic, Published: Feb 23, 2015.

Section: Summary: "A VLAN-tagged interface can process traffic for multiple VLANs... An untagged interface can process traffic for only a single VLAN." This reference invalidates option A, which suggests using two untagged VLANs on one trunk.

3. F5 Networks Knowledge Base, K7214: Overview of BIG-IP LACP, Published: Feb 23, 2015.

Section: Description: "The Link Aggregation Control Protocol (LACP) is part of the IEEE 802.3ad specification. LACP provides additional link aggregation functionality and failover." This confirms that LACP is the standard protocol used to enable fault tolerance in a trunk.