Virtual Local Area Networks (VLANs) Which of the following statements accurately describes VLANs in Cisco switching environments?
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ATwo VLANs are configured by default on all Cisco switches
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BVLANs only work if you have a complete Cisco switched internetwork with no third-party switches
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CYou should not configure more than 10 switches in the same VTP domain
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DVTP (VLAN Trunking Protocol) is used to send VLAN information to switches in a configured VTP domain
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EVLANs cannot be implemented on managed switches
Answer
Correct Answer: VTP (VLAN Trunking Protocol) is used to send VLAN information to switches in a configured VTP domain
Explanation
Introduction / Context:Virtual Local Area Networks (VLANs) allow segmentation of broadcast domains within a switch network. They improve performance, enhance security, and provide logical separation of traffic. Cisco supports VLANs extensively and also provides the VLAN Trunking Protocol (VTP) for management.
Given Data / Assumptions:
- We are discussing VLANs in Cisco environments.
- VTP simplifies VLAN management across switches.
- Default VLAN configurations can vary by device.
Concept / Approach:
VTP (VLAN Trunking Protocol) allows VLAN configuration changes made on one switch to propagate to other switches in the same domain. This centralizes management but also requires careful version and mode settings to avoid network-wide disruptions.
Step-by-Step Solution:
Understand VLANs create separate broadcast domains.Recall that Cisco switches come with VLAN 1 by default, not two VLANs.Identify that VTP distributes VLAN configuration across a domain.Conclude that option D is the accurate statement.Verification / Alternative check:
Cisco documentation confirms VLAN 1 exists by default, and VTP propagates VLAN information across switches in the same domain.
Why Other Options Are Wrong:
- Two VLANs by default: incorrect, typically only VLAN 1 exists.
- VLANs require only Cisco devices: false; VLANs are industry-standard (IEEE 802.1Q).
- Limiting VTP domains to 10 switches: no such restriction.
- VLANs cannot be implemented: false; they are a core managed switch feature.
Common Pitfalls:
- Assuming VLANs are Cisco-only; they are standardized (802.1Q).
- Misunderstanding default VLAN presence.
Final Answer:
VTP (VLAN Trunking Protocol) is used to send VLAN information to switches in a configured VTP domain