A network engineer must create a Layer 2 switch block design that has deterministic convergence and is loop-free at Layer 2. Which two switch block elements are needed to meet the requirements?…

Question

Options

• ALayer 3 link between distribution switches
• BHSRP with interface tracking on uplinks to core switches
• CRPVST with equal bridge priority on distribution switches
• DVLANs that do not span access switches
• ELayer 2 link between distribution switches

• A
  81% (25)
• B
  3% (1)
• C
  6% (2)
• E
  10% (3)

Explanation

A Layer 3 (routed) link between distribution switches eliminates Layer 2 adjacency between them, removing the possibility of a bridging loop at that tier and making convergence deterministic through routing protocol timers rather than STP. VLANs that do not span access switches (i.e., each VLAN is local to a single access switch) prevent inter-switch VLAN dependencies that would force STP to arbitrate loops across the distribution tier. Together, these two design choices confine any potential L2 domain to a single access switch and a single uplink path to distribution, making the topology inherently loop-free without relying on STP for convergence. A Layer 2 link between distribution switches (option E) would reintroduce loops requiring STP, and RPVST with equal priority (option C) does not eliminate loops-it simply elects a root, which is non-deterministic when priorities are equal.

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