You are creating an Ethernet channel that spans two or more switches. Which feature must be
supported by the switches?

A.
Cross stack

B.
None; Ethernet channel cannot span switches

C.
Fast port

D.
Spanning tree

Explanation:
Cross stack can span an EtherChannel across two switches. All of the links of the EtherChannel
will be active at any time. So if you configured an EtherChannel using four ports on a blade and
connected two ports to each of two switches configured for cross stack, your traffic would be
flowing across all 4 ports.