Which two types of traffic are carried over a vPC peer link when no failure scenarios are present?
(Choose two.)

A.
multicast data traffic

B.
unicast data traffic

C.
broadcast data traffic

D.
vPC keep-alive messages

Explanation:
The vPC peer link is the link used to synchronize states between the vPC peer devices. The vPC peer
link carries control traffic between two vPC switches and also multicast, broadcast data traffic. In
some link failure scenarios, it also carries unicast traffic. You should have at least two 10 Gigabit
Ethernet interfaces for peer links.

http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-seriesswitches/configuration_guide_c07-543563.html