SW1 interface g0/1 is shown as down/down. Which two reasons could explain this state? (Choose two.)

An interface showing a status of down/down indicates that both the physical layer (Layer 1) and the data link layer (Layer 2) are not operational. "The interface is error-disabled" is a correct reason. When an interface enters an error-disabled state (e.g., due to port security violations, BPDU guard, or UDLD), it is administratively shut down by the switch, resulting in a down/down status. "There is a speed mismatch" is also a correct reason. If two connected interfaces are configured for different speeds (e.g., one at 100 Mbps and the other at 1 Gbps) and cannot auto-negotiate, the physical link will not establish, leading to a down/down state. "The interface is shut down" is correct, but only one of the two correct answers. An administratively shut down interface will show down/down. "There is a protocol mismatch" and "There is a duplex mismatch" are typically incorrect for a down/down state. A protocol mismatch (e.g., routing protocol) usually affects Layer 3 and above, while a duplex mismatch often results in a link that is up/down (physical layer up, data link layer down) or up/up with poor performance, not down/down.