300-320 · Question #483
300-320 Question #483: Real Exam Question with Answer & Explanation
The correct answer is D: Create a VSS between the two distribution switches and also create a MEC between the VSS. VSS (Virtual Switching System) logically combines two physical distribution switches into a single virtual switch with one control plane. When access switches uplink to both distribution switches using MEC (Multichassis EtherChannel), the access switch sees a single logical switc
Question
Options
- AEnable backbone fast on the two distribution switches and create a port channel between each
- BConfigure HSRP for all VLANs and adjust the hello timer for faster convergence
- CConfigure Rapid PVST+ and adjust the timers for fast convergence
- DCreate a VSS between the two distribution switches and also create a MEC between the VSS
Explanation
VSS (Virtual Switching System) logically combines two physical distribution switches into a single virtual switch with one control plane. When access switches uplink to both distribution switches using MEC (Multichassis EtherChannel), the access switch sees a single logical switch and forms a standard EtherChannel - all uplinks become active and forwarding simultaneously because STP sees no loop (it appears as a single switch on both ends). This eliminates the STP-blocked port problem entirely. Options A, B, and C all rely on STP or HSRP, which fundamentally requires at least one port to be blocked or in standby state, meaning not all links are actively forwarding at the same time.
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