A network engineer is designing an access layer that requires all uplinks to be active. Furthermore, VLANs must span across the entire switch block. What design fulfills this requirement?

Question

Options

• ALayer 2 looped triangle
• BLayer 2 looped square
• CLayer 2 loop-free U
• DLayer 2 loop-free inverted U

• A
  11% (4)
• B
  6% (2)
• C
  3% (1)
• D
  81% (29)

Explanation

A Layer 2 loop-free inverted U design places access switches at the bottom, each dual-homed to two distribution switches, with NO direct link between the distribution switches. Because there are no loops in this topology, STP has nothing to block-all uplinks remain active simultaneously. VLANs can still span across the entire switch block via the distribution layer. In looped designs (triangle or square), STP must block one or more ports to prevent broadcast storms, making some uplinks inactive. The loop-free U design is similar but has only a single uplink per access switch, so the inverted U is the only option that satisfies both requirements.

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