Which statement explains why a Cisco UCS 6200 Fabric Interconnect that is configured in end-host
mode is beneficial to the unified fabric network?

A.
There is support for multiple (power of 2) uplinks.

B.
Upstream Layer 2 disjoint networks will remain separated.

C.
The 6200 can connect directly via vPC to a Layer 3 aggregation device.

D.
STP is not required on the uplink ports from the 6200.

Explanation:
In Cisco Unified Computing System environments, two Ethernet switching modes determine the way
that the fabric interconnects behave as switching devices between the servers and the network. In
end-host mode, the fabric interconnects appear to the upstream devices as end hosts with multiple
links. In end-host mode, the switch does not run Spanning Tree Protocol and avoids loops by
following a set of rules for traffic forwarding. In switch mode, the switch runs Spanning Tree Protocol
to avoid loops, and broadcast and multicast packets are handled in the traditional way.

http://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/unifiedcomputing/whitepaper_c11-701962.html