When you use a Cisco UCS fabric interconnect, which protocol must be configured between the fabric interconnect and the ESX/ server?

Question

Options

• APFC
• BVPC
• CHSRP
• DCisco Discovery Protocol

• A
  3% (1)
• B
  94% (33)
• D
  3% (1)

Explanation

VPC (Virtual Port Channel) must be configured between the Cisco UCS fabric interconnect and ESXi/servers to create a single logical port channel that spans both fabric interconnects, giving the server the appearance of one upstream device while providing link redundancy and load balancing without relying on Spanning Tree Protocol.

Why the distractors are wrong:

• A (PFC) - Priority Flow Control is an IEEE 802.1Qbb Data Center Bridging protocol used for lossless FCoE transport, not the primary connectivity protocol configured between the fabric interconnect and a server.
• C (HSRP) - Hot Standby Router Protocol provides first-hop gateway redundancy at Layer 3; it has no role in the fabric interconnect-to-server link.
• D (CDP) - Cisco Discovery Protocol is a Layer 2 neighbor discovery tool used passively; it is not something you "configure" as a connectivity protocol between devices.

Memory tip: Think "V = Virtual redundancy" - vPC makes two physical fabric interconnects look like one virtual switch to the connected server, which is exactly what UCS needs to provide dual-path redundancy without STP complications.

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