Which Cisco switch feature should you use to achieve th…

You are a network administrator for your organization. Your organization has two Virtual LANs (VLANs) named
Marketing and Production. All switches in the network have both VLANs configured on them. Switches A, C, F,
and G have user machines connected for both VLANs, while switches B, D, and E have user machines
connected for the Production VLAN only. (Click the Exhibit(s) button to view the network diagram.)

To reduce broadcast traffic on the network, you want to ensure that broadcasts from the Marketing VLAN are
flooded only to those switches that have Marketing VLAN users.
Which Cisco switch feature should you use to achieve the objective?

A.
PVST

B.
RSTP

C.
VTP Pruning

D.
Dynamic VLANs

Explanation:
The VLAN Trunking Protocol (VTP) pruning feature of Cisco VTP allows switches to dynamically delete or add
VLANs to a trunk. It restricts unnecessary traffic, such as broadcasts, to only those switches that have user
machines connected for a particular VLAN. It is not required to flood a frame to a neighboring switch if that
switch does not have any active ports in the source VLAN. A trunk can also be manually configured with its
allowed VLANs, as an alternative to VTP pruning.
All other options are incorrect because none of these features can be used to achieve the objective in this
scenario.
The Per-VLAN Spanning Tree (PVST) feature allows a separate instance of Spanning Tree Protocol (STP) per
VLAN. Each VLAN will have its own root switch and, within each VLAN, STP will run and remove loops for that
particular VLAN.
Rapid Spanning Tree Protocol (RSTP) is an Institute of Electrical and Electronics Engineers (IEEE) standard. It
reduces high convergence time that was previously required in STP implementations. It is interoperable with
STP (802.1d).
With dynamic VLANs, the switch automatically assigns a switch port to a VLAN using information from the user
machine, such as its Media Access Control (MAC) address or IP address. The switch then verifies information
with a VLAN Membership Policy Server (VMPS) that contains a mapping of user machine information to
VLANs.
Objective:
LAN Switching Fundamentals
Sub-Objective:
Configure, verify, and troubleshoot VLANs (normal/extended range) spanning multiple switches

Cisco > Catalyst 6500 Series Cisco IOS Software Configuration Guide, 12.1E > Configuring VTP
Cisco > Technology Support > LAN Switching > Virtual LANs/VLAN Trunking Protocol (VLANs/VTP) > Design >
Design TechNotes > How LAN Switches Work > Document ID: 10607