A switched network is being designed to support a manufacturing factory. Due to cost constraints, fiber-based connectivity is not an option. Which design allows for a stable network when there is a…

Question

Options

• ADesign the network to include UDLD to detect unidirectional links and take them out of service.
• BDesign the network to include Ether Channel bundles to prevent a single-link failure from taking
• CDesign the network to include loop guard to prevent a loop in the switched network when a link
• DDesign the network to include Backbone Fast on all devices to accelerate failure convergence

• A
  3% (1)
• B
  83% (24)
• C
  3% (1)
• D
  10% (3)

Explanation

EtherChannel bundles multiple physical copper links into one logical link, so when electromagnetic interference (EMI) from factory machinery disrupts or drops an individual cable, the remaining links in the bundle keep the connection active - no outage, no reconvergence needed.

Why the distractors are wrong:

• A (UDLD): UDLD removes links from service when it detects a unidirectional failure - it reduces available paths rather than providing redundancy. It's also primarily useful for fiber optic deployments, not copper.
• C (Loop Guard): Loop Guard prevents STP topology loops by blocking a port that stops receiving BPDUs; it does nothing to maintain connectivity when a link physically fails due to interference.
• D (Backbone Fast): This Cisco-proprietary STP feature speeds up reconvergence after an indirect link failure, but the network still experiences a disruption window. Faster recovery is not the same as preventing the failure impact in the first place.

Memory tip: Think of EtherChannel as "interference insurance" - EMI would have to simultaneously destroy all bundled cables to cause an outage, which is far less likely than killing a single link. When the environment is hostile to copper, bundle it.

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