Which configurations will accurately form a trunk between two switches connected by a crossover cable? (Choose two answers.)

To accurately establish a trunk between two switches connected by a crossover cable, the configuration needs to allow for the exchange of VLAN information between the switches. The correct pair of configurations should promote the negotiation of trunking protocols.

Choosing dynamic desirable and dynamic auto is correct because the switch configured with dynamic desirable actively tries to initiate trunking and can form a trunk if the other end is configured in a mode that allows trunking to happen, such as dynamic auto. The dynamic auto configuration will respond and agree to create a trunk if the other switch sends a request to trunk. This allows for the negotiation of trunking using the Dynamic Trunking Protocol (DTP).

The other configurations, while they may work under specific conditions, do not accurately represent the robust negotiation needed for trunk formation in this context. Configurations like static trunk and dynamic auto will only work if the static trunk offers a fixed configuration while the dynamic end can respond; however, it doesn’t utilize the full negotiation capability of DTP. The access mode configurations, either on their own or paired with dynamic auto, do not support trunk negotiation and instead configure ports to only carry traffic for a single VLAN.