Which of the following is not the advantage of WDM?

• A.gold replacement for SDH equipment
• B.Large capacity and transparent data transfer
• C.Easy to upgrade and maximize protection for existing investments
• D.Future compatible with all optical switching networks

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A PAUSE frames use reserved multicast addresses and are not forwarded by bridges or switches. In this way, the PAUSE frame does not generate any additional information.

• A.Error
• B.True

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Which of the following is the default WTR time for MSP switching?

• A.6 min
• B.15 minutes
• C.12 min
• D.10 minutes

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Which of the following different types of ESC are divided according to the principles of implementation? (Multiple choice)

• A.insert DCC
• B.Pilot adjusts DCC
• C.Fixed frame structure DCC
• D.None of the above

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In the frame structure of the SDH signal, there are large overhead bytes for operation, management, and maintenance (OAM). Overhead bytes account for all bits () of the entire frame and greatly enhance the monitoring capabilities of the network.

• A.1/10
• B.1/20
• C.1/30
• D.1/40

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