300-320 Question #696: Real Exam Question with Answer & Explanation

The correct answer is C: STP must be implemented as a loop-avoidance mechanism.. VSS (Virtual Switching System) logically combines two physical Cisco Catalyst switches into a single switch. (C) STP must still be implemented as a loop-avoidance mechanism for access ports that are not part of a Multichassis EtherChannel (MEC), since not all links in the campus

Question

A network engineer must propose a scalable enterprise campus access-distribution design model. Which two scaling factors are the most important to be considered for the Virtual Switching System model? (Choose two.)

Options

AVSS stops VLAN spanning to the access switches.
BBoth VSS nodes are active from control-plane perspective.
CSTP must be implemented as a loop-avoidance mechanism.
DVSS eliminates the need to implement FHRP for each VLAN.
ESTP root and FHRP primary must be tuned at the same node.

Explanation

VSS (Virtual Switching System) logically combines two physical Cisco Catalyst switches into a single switch. (C) STP must still be implemented as a loop-avoidance mechanism for access ports that are not part of a Multichassis EtherChannel (MEC), since not all links in the campus can be bundled into MEC. (D) Because the VSS pair appears as a single logical device sharing one management IP and one MAC address per SVI, there is no need to configure FHRP (e.g., HSRP/VRRP) on a per-VLAN basis-a major simplification. Option A is false (VSS does not inherently prevent VLAN spanning). Option B is false (one node is VSS Active and controls the control plane; the other is VSS Standby). Option E is irrelevant to VSS scaling.

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