VLAN fundamentals: Which of the following statements about VLANs is true?
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AYou must have at least two VLANs defined in every Cisco switched network.
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BAll VLANs are configured at the fastest switch and automatically propagate to all others.
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CYou should not have more than 10 switches in the same VTP domain.
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DVTP is used to send VLAN information to switches in a configured VTP domain.
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EAll VLANs require a router to forward frames.
Answer
Correct Answer: VTP is used to send VLAN information to switches in a configured VTP domain.
Explanation
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:
Check each statement.Correct: VTP distributes VLAN info within a domain.Other statements are misconceptions or inaccurate.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.