VLAN fundamentals: Which of the following statements about VLANs is true?

Introduction / Context:
Virtual LANs (VLANs) segment networks logically. Cisco uses the VLAN Trunking Protocol (VTP) to manage and propagate VLAN information across switches.

Given Data / Assumptions:

• We want the correct fact about VLAN/VTP operation.

Concept / Approach:
VTP allows a central switch to manage VLAN additions/deletions and propagate them to others within the same VTP domain.

Step-by-Step Solution:

Verification / Alternative check:
Use show vtp status to confirm domain and VLAN counts.

Why Other Options Are Wrong:

• A: Only one VLAN is needed, not mandatory to have two.
• B: No such “fastest switch” concept; VLANs must be configured or propagated via VTP.
• C: Arbitrary limit of 10 switches is incorrect.
• E: Routers (or L3 switches) are only needed for inter-VLAN routing.

Common Pitfalls:
Confusing VTP’s role; assuming multiple VLANs are always mandatory.

Final Answer:
VTP is used to send VLAN information to switches in a configured VTP domain.