Which technology uses LLDP TLVs to tell connected devices information such as the correct queue for PFC?

Question

Options

• AETS
• BPFC
• CECN
• DDCBx

• B
  3% (1)
• C
  3% (1)
• D
  94% (29)

Explanation

DCBx (Data Center Bridging Capability Exchange) is the correct answer because it is the specific protocol designed to use LLDP TLVs to advertise and negotiate DCB features - including which priority queues map to PFC - between directly connected devices in a data center fabric.

Why the distractors are wrong:

• A (ETS): Enhanced Transmission Selection defines how bandwidth is allocated among traffic classes but doesn't itself use LLDP TLVs to communicate that policy to peers - DCBx carries ETS configuration on its behalf.
• B (PFC): Priority-based Flow Control is a feature that DCBx negotiates and enables; PFC defines the pause mechanism per queue but is not the transport/exchange protocol.
• C (ECN): Explicit Congestion Notification operates at Layer 3/4 by marking packets during congestion - it has nothing to do with LLDP or TLV advertisements.

Memory tip: Think of DCBx as the "eXchange" layer - the X in DCBx literally stands for eXchange, and LLDP TLVs are the vehicle for that exchange. ETS and PFC are the features; DCBx is the negotiation protocol that tells neighbors about them.

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