On the switched network shown in the figure, STP is enabled on all devices.

STP elects the root bridge using the lowest Bridge ID, which consists of bridge priority and MAC address.

All switches have the same priority, but SW1 has the lowest bridge MAC address. Therefore, SW1 becomes the root bridge, making B true.

All active ports on the root bridge operate as designated ports, so C is also true.

SW3 selects its direct connection to SW1 as its root port because this provides the lowest root path cost. Its connection toward SW2 becomes an alternate port, while its connection toward SW4 is designated. Therefore, SW3 does not have two alternate ports, making A false.

The forwarding path from SW2 to SW4 follows SW2 → SW1 → SW3 → SW4, not the path stated in D.

Therefore, A and D are false.

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