350-401 Architecture Practice Question
A network architect is evaluating Cisco StackWise Virtual for a pair of distribution switches. The design requires that the two switches appear as a single logical entity for Layer 2 and Layer 3 forwarding, and that they support Multichassis EtherChannel (MEC) to access switches. Which statement accurately describes a characteristic of Cisco StackWise Virtual?
⚠ Common exam trap
The trap here is assuming that StackWise Virtual uses a dedicated stacking cable like traditional StackWise, when it actually uses standard Ethernet ports for the virtual link.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It supports active/active forwarding, allowing both switches to forward traffic simultaneously.
Cisco StackWise Virtual allows two physical switches to operate as a single logical switch, supporting active/active forwarding. This means both switches can forward traffic simultaneously, and Multichassis EtherChannel (MEC) can be used to connect access switches to both distribution switches for redundancy and load sharing. This design provides high availability and efficient bandwidth utilization.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It requires a dedicated stack cable between the switches for control plane communication.
Why it's wrong here
Cisco StackWise Virtual uses standard Ethernet ports (typically 10G or 40G) for the virtual link, not a dedicated stacking cable like traditional StackWise. The virtual link carries control plane and data plane traffic, and it can be an EtherChannel for redundancy. This distinction is important for cabling and port planning.
- ✗
It is limited to two switches and cannot be expanded to more than two.
Why it's wrong here
Cisco StackWise Virtual is indeed limited to two switches, but the statement as phrased is misleading because it implies a limitation that is actually a design characteristic. However, the question asks for an accurate characteristic, and the active/active forwarding is a key feature. The limitation to two switches is true, but it is not the most relevant characteristic for the scenario described.
- ✗
It requires that both switches run different IOS versions to ensure compatibility.
Why it's wrong here
Cisco StackWise Virtual requires that both switches run the same Cisco IOS XE software version to operate correctly. Running different versions is not supported and can cause instability. The software version must be identical to ensure proper synchronization of control plane and data plane states.
- ✓
It supports active/active forwarding, allowing both switches to forward traffic simultaneously.
Why this is correct
Cisco StackWise Virtual enables active/active forwarding, meaning both switches in the virtual domain can forward traffic concurrently. This provides load balancing and increased bandwidth utilization. Multichassis EtherChannel (MEC) leverages this capability, allowing access switches to form a port-channel with both distribution switches for redundancy and increased throughput.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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