CCNA Routing and Switching (legacy) — Question 48

Which three statements about DWDM are true? (Choose three)

Answer options

• A. It allows a single strand of fiber to support bidirectional communications
• B. It is used for long-distance and submarine cable systems
• C. It can multiplex up to 256 channels on a single fiber
• D. It supports both the SDH and SONET standards
• E. Each channel can carry up to a 1-Gbps signal
• F. It supports simplex communications over multiple strands of fiber

Correct answer: C, D, E

Explanation

The correct answers C, D, and E highlight the capabilities of DWDM technology, including its ability to multiplex a large number of channels and support industry standards. Options A and F are incorrect because DWDM primarily focuses on multiplexing over a single fiber strand, not simplex communications, and it does not inherently enable bidirectional communication without additional configurations.