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300-320 · Question #202
300-320 Question #202: Real Exam Question with Answer & Explanation
The correct answer is B: loop-free U. The loop-free U design routes between distribution switches at Layer 3, which breaks the Layer 2 domain and prevents VLAN extension.
Question
Which of these Layer 2 access designs does not support VLAN extensions?
Options
- AFlexLinks
- Bloop-free U
- Clooped square
- Dlooped triangle
- Eloop-free inverted U
Explanation
The loop-free U design routes between distribution switches at Layer 3, which breaks the Layer 2 domain and prevents VLAN extension.
Common mistakes.
- A. FlexLinks provides a redundant active/standby link pair as a STP-free alternative and maintains Layer 2 connectivity, supporting VLAN extension.
- C. The looped square design maintains Layer 2 trunking throughout its topology, allowing VLANs to span across the design.
- D. The looped triangle design uses Layer 2 trunks between access and distribution, preserving VLAN continuity and supporting extension.
- E. The loop-free inverted U design keeps Layer 2 connectivity between access and distribution tiers, supporting VLAN extensions from access upward.
Concept tested. Layer 2 access topology VLAN extension support
Reference. https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/campover.html
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