When configuring a switch to connect to a router that is being configured with a ROAS configuration, which Cisco IOS command must be entered on the interface to ensure that the link forms a trunk?

A) switchport mode trunk
B) switchport mode dynamic desirable
C) switchport mode access
D) switchport mode trunk router

A
Explanation: A) Because routers don't support the Dynamic Trunking Protocol (DTP), links that need to form a trunk connected to them must be statically configured with the switchport mode trunk command.

Computer Science & Information Technology

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