An engineer must configure interswitch VLAN communication between a Cisco switch and a third-party switch. Which action should be taken? 

Answer options:

A. configure DSCP
B. configure IEEE 802.1q
C. configure ISL
D. configure IEEE 802.1p

B

VLAN trunking offers two options, ISL and 802.1Q.ISL is Cisco proprietary while 802.1Q is standards based and supported by multiple vendors.