300-320 Question #497: Real Exam Question with Answer & Explanation

The correct answer is B: VSL. VSL (Virtual Switch Link) is the dedicated high-speed link (or port-channel) that physically connects the two chassis in a VSS (Virtual Switching System) pair. It carries both the control plane communication (configuration synchronization, SSO state) and data-plane traffic betwee

Question

When 2 distribution switches are configured for VSS, what needs to be done to extend back plane connectivity?

Options

AISL
BVSL
CVSS
DPAgP

Explanation

VSL (Virtual Switch Link) is the dedicated high-speed link (or port-channel) that physically connects the two chassis in a VSS (Virtual Switching System) pair. It carries both the control plane communication (configuration synchronization, SSO state) and data-plane traffic between the two switches, effectively acting as the virtual back plane for the combined logical switch. ISL (A) is an older Cisco proprietary VLAN trunking protocol, unrelated to VSS. VSS (C) is the overall technology name, not the specific link type. PAgP (D) is a Cisco port aggregation protocol for EtherChannel negotiation, not a VSS back plane mechanism - VSL port-channels use a dedicated mode, not PAgP.

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