Which technology allows optical transport management to gain visibility into an IP-over- DWDM interface residing in a router?

Question

Options

• AGMPLS-UNI
• BTL1
• Cvirtual transponder
• Dnetwork functions virtualization

• A
  6% (2)
• B
  3% (1)
• C
  80% (28)
• D
  11% (4)

Explanation

A virtual transponder solves a specific visibility problem in IP-over-DWDM architectures: when the transponder function is embedded inside a router's line card (rather than being a standalone optical device), the optical transport management plane loses sight of it. The virtual transponder exposes that embedded optical interface's parameters and status to the optical layer management system (e.g., a ROADM controller), bridging the IP and optical management domains.

Why the distractors are wrong:

• A. GMPLS-UNI is a control-plane signaling protocol for setting up connections at the boundary between client and optical networks - it handles path setup, not optical layer visibility into router interfaces.
• B. TL1 is a legacy command-line management protocol used mainly in SONET/SDH equipment; it's a communication language, not a mechanism for cross-domain visibility.
• D. NFV is a broad architectural concept about running network functions as software on commodity hardware - unrelated to gaining optical management visibility into router-embedded optics.

Memory tip: Picture a physical transponder sitting in a rack - it's fully visible to the optical management system. When that transponder disappears into the router, you need a virtual stand-in to keep the optical layer "informed." Virtual = visibility for what's now hidden inside the router.

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