300-320 Question #301: Real Exam Question with Answer & Explanation

The correct answer is A: It allows a device to connect to two separate upstream devices as if they were a single device.. Virtual Port Channel (vPC) is a Cisco Nexus feature that allows a downstream device (such as a server or switch) to form a single port-channel (LAG) connecting to two separate upstream Nexus switches simultaneously. The downstream device sees one logical link, eliminating STP-blo

Question

Which statement about vPC technology is true?

Options

AIt allows a device to connect to two separate upstream devices as if they were a single device.
BIt provides the ability to pair two servers in the data center.
CIt promotes better STP designs in the switching infrastructure.
DIt supports IEEE 802.1Q only.

Explanation

Virtual Port Channel (vPC) is a Cisco Nexus feature that allows a downstream device (such as a server or switch) to form a single port-channel (LAG) connecting to two separate upstream Nexus switches simultaneously. The downstream device sees one logical link, eliminating STP-blocked ports and providing both redundancy and full bandwidth utilization. Option B is incorrect - vPC pairs upstream switches, not servers. Option C is incorrect - vPC actually bypasses STP rather than improving STP designs. Option D is incorrect - vPC is not limited to 802.1Q; it operates at the port-channel level across various encapsulations.

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