A network engineer must improve bandwidth and resource utilization on the switches by stopping the inefficient flooding of frames on trunk ports where the frames
are not needed. Which Cisco IOS feature can be used to achieve this task?

A.
VTP pruning

B.
access list

C.
switchport trunk allowed VLAN

D.
VLAN access-map

Explanation:
Cisco advocates the benefits of pruning VLANs in order to reduce unnecessary frame flooding. The “vtp pruning” command prunes VLANs automatically, which
stops the inefficient flooding of frames where they are not needed.
http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series- switches/24330-185.html