A network engineer designing an access layer that requires all uplinks to be active, furthermore, VLANs must span across the entire switch block. Which two design fulfill this requirement?

Question

Options

• ALayer 2 Flex Links
• BLayer 2 loop-free inverted
• CLayer 2 loop square
• DLayer 2 loop-free U

• A
  9% (3)
• B
  73% (24)
• D
  18% (6)

Explanation

These are Cisco campus design topologies that permit all uplinks to remain active without creating switching loops. The 'Layer 2 loop-free inverted U' topology (choice D, note: the question names it 'loop-free U') and the 'loop-free inverted' (choice B) achieve loop-free Layer 2 by ensuring there is a single logical path between any two points - but only loop-square and loop-free inverted designs allow ALL uplinks to be active while spanning VLANs across the entire block. Layer 2 Flex Links (choice A) is a resilience mechanism that keeps one link in standby (not active), so it does not meet the 'all uplinks active' requirement. The loop-free inverted and loop-square designs use STP or equivalent mechanisms arranged so that no uplink is blocked, satisfying both conditions: all uplinks active and full VLAN reachability across the switch block.

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