Which three Layer 2 access designs have all of their uplinks in an active state? (Choose three.)

The correct answer is B. loop-free U C. looped square E. loop-free inverted U. In Cisco's Layer 2 access design taxonomy, the loop-free U (B), looped square (C), and loop-free inverted U (E) topologies are designed so that all uplinks from the access layer to the distribution layer are in an active forwarding state simultaneously. These designs either…

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Question

Options

AFlex Links
Bloop-free U
Clooped square
Dlooped triangle
Eloop-free inverted U

How the community answered

(57 responses)

A
12% (7)
B
82% (47)
D
5% (3)

Explanation

In Cisco's Layer 2 access design taxonomy, the loop-free U (B), looped square (C), and loop-free inverted U (E) topologies are designed so that all uplinks from the access layer to the distribution layer are in an active forwarding state simultaneously. These designs either avoid loops by construction (loop-free variants) or use STP tuning and routing at the distribution layer to allow all paths to forward. Flex Links (A) is an STP alternative that uses an active/standby link pair - only one link forwards at a time. Looped triangle (D) creates a triangle between two access switches and two distribution switches; STP will block at least one port to prevent a loop, meaning not all uplinks are active.

Topics

#Layer 2 access design#loop-free topologies#active uplinks#looped square

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