300-320 · Question #320
Which option is correct when using Virtual Switching System?
The correct answer is C. Both data planes forward traffic simultaneously. Cisco VSS (Virtual Switching System) combines two physical Catalyst switches into a single logical switch. In VSS, there is only ONE logical control plane managed by the active VSS member - the standby member's control plane is subordinate (choice A is false; choice D is…
Question
Which option is correct when using Virtual Switching System?
Options
- ABoth control planes forward traffic simultaneously
- BOnly the active switch forward traffic
- CBoth data planes forward traffic simultaneously
- DOnly the active switch handle the control plane
How the community answered
(29 responses)- A3% (1)
- B3% (1)
- C93% (27)
Explanation
Cisco VSS (Virtual Switching System) combines two physical Catalyst switches into a single logical switch. In VSS, there is only ONE logical control plane managed by the active VSS member - the standby member's control plane is subordinate (choice A is false; choice D is partially true but misleads). However, BOTH physical switches forward traffic simultaneously using their individual data planes - this is the key performance benefit of VSS over traditional active/standby HA. Both chassis participate in CEF-based packet forwarding at line rate, and the Virtual Switch Link (VSL) connects them. This contrasts with HSRP/VRRP where only the active device forwards. Choice B ('only active switch forwards') describes the older active/standby model, not VSS.
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