300-320 Question #348: Real Exam Question with Answer & Explanation

The correct answer is D: Mulitchassis EtherChannel. VSS (Virtual Switching System) merges two physical switches into one logical switch. When access-layer switches uplink to both VSS members via a single Multichassis EtherChannel (MEC), the entire access-to-distribution topology becomes loop-free from STP's perspective-STP is not

Question

Which technology should a network designer combine with VSS to ensure a loop free topology with optimal convergence time?

Options

APortfast
BUplinkFast
CRPVST +
DMulitchassis EtherChannel

Explanation

VSS (Virtual Switching System) merges two physical switches into one logical switch. When access-layer switches uplink to both VSS members via a single Multichassis EtherChannel (MEC), the entire access-to-distribution topology becomes loop-free from STP's perspective-STP is not needed to block any ports. Because no links are blocked, all bandwidth is active and failover is handled at the EtherChannel layer in milliseconds, giving optimal convergence. Options like RPVST+ or UplinkFast still rely on STP blocking/unblocking, which is slower.

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