Answer & Solution
Answer: Option E
Solution:
If you are on a 2950 switch, then the interface command is just
switchport mode trunk
, since the 2950 can only run the IEEE 802.1Q version. However, a 3550 can run both ISL and 802.1Q, so you must use the encapsulation command. The argument to choose 802.1Q for a trunking protocol is
dot1q
.