Switchport trunk Encap question

crawfsh

I am scheduled to take my 640-801 tomorrow. I feel pretty ready but I can't find an answer to this question.

Switch B is a Catalyst 2924 switch you're configuring to support VLAN trunking. Switch B is both ISL and 802.1q capable. Switch A is encapsulating 802.1Q. You want Switch B's port to be in trunk mode regardless of the port configured on Switch A. Which two commands should you use to configure the trunk port on Switch B? (Choose two).

1. switchport mode auto
2. switchport mode trunk
3. switchport trunk encapsulation dot1q
4. switchport trunk encapsulation 802.1q
5. switchport trunk encapsulation isl

I chose answers 2 and 4, but the correct answers are 2 and 3. If one side is encapsulating 802.1Q why would you choose a different encapsulation method for the other side?

Could this be an error in the TestOut application or am I wrong. If I am wrong can someone explain this to me. Thanks, and wish me luck tomorrow.

boyles23

802.1q is the encapsulation method but when you type it into the interface you use the format dot1q not 802.1q.

crawfsh

OK, this makes sense. I seem to remember now that you only have the choices of ISL or dot1q. Thanks for clarifying this for me. Beating my head against the wall since last night.

boyles23

No problem, I am getting ready to take the 801 in about 3 weeks. Gotta beat the deadline!

Don't believe in luck but good luck tommorrow, I am sure you will do fine.

Plazma

yea best of luck!