which trunk mode would you set the local port to on R1

If you were to set up a VLAN trunk over a Fast Ethernet link on switch R1, which trunk mode would you set the local port to on R1 if you wanted it to respond to requests from its link partner (R2) and become a trunk?

A.
Auto

B.
Negotiate

C.
Designate

D.
Nonegotiate

Explanation:

Only ports in desirable and auto mode will negotiate a channel (either desirable-auto or desirable-desirable). Ports in on mode will only form a functional channel with other ports in on mode (they will not negotiate a channel with ports in desirable or auto mode).
Reference: Cisco, Troubleshooting Tips
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/trbl_ja.htm