Which two advantages of using DWDM over traditional optical networks are true?

Dense Wavelength Division Multiplexing (DWDM) enables multiple optical signals to be transmitted simultaneously on different wavelengths over a single fiber, allowing:

B: Efficient bandwidth expansion without laying new fiber infrastructure.

C: Topology flexibility and service protection using built-in features like optical protection switching, automatic fault detection, and self-healing rings.

Why other options are incorrect:

A: Oversubscription of bandwidth applies more to packet-based networks, not DWDM optical layer.

D: Chromatic dispersion is managed but not an inherent “intelligent” feature in DWDM.

E: Service protection at the DWDM layer operates independently of upper layer protocols.

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