Cisco Exam Questions

Which two protocols can be automatically negotiated bet…

Which two protocols can be automatically negotiated between switches for trunking? (Choose two.)

A.
PPP

B.
DTP

C.
ISL

D.
HDLC

E.
DLCI

F.
DOT1Q

Explanation:
Switches such as the Catalyst 3550 that are capable of either 802.1Q or ISL trunking encapsulation, the switchport trunk encapsulation [dot1q | isl | negotiate]
interface command must be used prior to the switchport mode trunk command.
https://learningnetwork.cisco.com/servlet/JiveServlet/previewBody/14792-102-1- 57313/Dynamic%20Trunking%20Protocol.PDF