An access switch has been configured with an EtherChannel port. After configuring SPAN to monitor this port, the network administrator notices that not all traffic is
being replicated to the management server. What is a cause for this issue?

A.
VLAN filters are required to ensure traffic mirrors effectively.

B.
SPAN encapsulation replication must be enabled to capture EtherChannel destination traffic.

C.
The port channel can be used as a SPAN source, but not a destination.

D.
RSPAN must be used to capture EtherChannel bidirectional traffic.

Explanation:
A source port or EtherChannel is a port or EtherChannel monitored for traffic analysis. You can configure both Layer 2 and Layer 3 ports and EtherChannels as
SPAN sources. SPAN can monitor one or more source ports or EtherChannels in a single SPAN session. You can configure ports or EtherChannels in any VLAN
as SPAN sources. Trunk ports or EtherChannels can be configured as sources and mixed with nontrunk sources. A port-channel interface (an EtherChannel) can
be a SPAN source, but not a destination.
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12- 2SX/configuration/guide/book/span.html#wp1040905