352-001 Question #415: Real Exam Question with Answer & Explanation

The correct answer is C: A loop-free U design extends VLANs between access switches, but a loop-free inverted U design. In a loop-free U design, access switches have uplinks to both distribution switches, and VLANs can be extended (stretched) across multiple access switches through the distribution layer - this enables Layer 2 adjacency between hosts on different access switches. In a loop-free in

Question

Which statement describes the main difference between the Layer 2 loop-free inverted U design and the Layer 2 loop-free U design?

Options

AA loop-free U design has all uplinks active, but a loop-free inverted U design does not.
BA loop-free inverted U design has all uplinks active, but a loop-free U design does not.
CA loop-free U design extends VLANs between access switches, but a loop-free inverted U design
DA loop-free U design extends VLANs between distribution switches, but a loop-free inverted U

Explanation

In a loop-free U design, access switches have uplinks to both distribution switches, and VLANs can be extended (stretched) across multiple access switches through the distribution layer - this enables Layer 2 adjacency between hosts on different access switches. In a loop-free inverted U design, each access switch is isolated; VLANs are local to each access switch and are not extended to neighboring access switches. The 'inverted U' shape conceptually flips the topology so that distribution switches act as the boundary - preventing inter-access-switch VLAN extension and providing a cleaner Layer 2 domain boundary. This is the key architectural distinction: the U design allows VLAN extension between access switches; the inverted U design does not.

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