You are about to migrate a customer network to use a VSS. Which of these statements is true about a VSS?

Question

Options

• AThe VSS switch must be the root bridge for all VLANs and is automatically designated.
• BThe VSS switch is defined in RFC 4318 as a managed object.
• CThe PAgP+ or LACP protocols are used to maintain the operational state of the VSS devices. D. A
• DThe 802.1Q or ISL protocols are used to maintain the operational state of the VSS devices.
• EA VSS increases the size of the spanning-tree domain.

• B
  6% (1)
• C
  88% (15)
• D
  6% (1)

Explanation

A VSS (Virtual Switching System) is Cisco's proprietary technology that combines two physical chassis into a single logical switch. The VSL (Virtual Switch Link) between the two chassis and the multichassis EtherChannels (MEC) connected to downstream devices use PAgP+ (Cisco's enhanced Port Aggregation Protocol) or LACP to maintain operational state and detect failures. Option A is false - the VSS is not automatically designated as root bridge; STP root selection still requires manual configuration or comparison of bridge IDs. Option B is false - VSS is a Cisco proprietary feature, not defined in any RFC. Option D is false - 802.1Q and ISL are VLAN trunking protocols, not VSS state-maintenance protocols. Option E is false - VSS actually collapses the spanning-tree domain by making the two chassis appear as one logical switch.

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