The Company network administrator needs to enable VTP pruning within the Company
network. What action should a network administrator take to enable VTP pruning on an
entire management domain?

A.
Enable VTP pruning on any switch in the management domain

B.
Enable VTP pruning on any client switch in the domain

C.
Enable VTP pruning on a VTP server in the management domain

D.
Enable VTP pruning on every switch in the domain

E.
None of the other alternatives apply

Explanation:
The default behavior of a switch is to propagate broadcast and unknown packets across the
network. This behavior results in a large amount of unnecessary traffic crossing the network.
VTP pruning increases bandwidth efficiency by reducing unnecessary flooding of traffic,
such as broadcast, multicast, unknown, and flooded unicast packets. VTP pruning increases
available bandwidth by restricting flooded traffic to those trunk links that the traffic must use
to access the appropriate network devices. By default, VTP pruning is disabled.
Enabling VTP pruning on a VTP server enables pruning for the entire management domain.
VTP pruning takes effect several seconds after it is enabled. By default, VLANs 2 through
1000 or 2 through 1001 are pruning eligible, depending upon the platform. VTP pruning does
not prune traffic from VLANs that are pruning ineligible. VLAN 1 is always pruning ineligible
and VLAN 1 cannot be removed from a trunk. However, the “VLAN 1 disable on trunk”
feature available on Catalyst 4000, 5000, and 6000 family switches enables the pruning of
user traffic, but not protocol traffic such as CDP and VTP, for VLAN 1 from a trunk. Use the
vtp pruning command to make VLANs pruning eligible on a Cisco IOS-based switch.
Switch(vlan)#vtp pruning
Once pruning is enabled, use the switchport trunk pruning command to make a specific
VLAN pruning ineligible.
Switch(config)#interface fastethernet 0/3
Switch(config-if)#switchport trunk pruning vlan remove vlan 5