Which of the following statements about the advantages of QinQ is correct?

• A.Solve the problem of increasingly scarce public network VLAN ID resources
• B.Make the user network more independent
• C.Users can plan their own private network VLAN ID
• D.Provide a simpler L3VPN solution

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Which of the following descriptions about single-site commissioning is wrong?

• A.It is strictly forbidden to plug and unplug the power plug and PIU single board while electrified
• B.If the input voltage of the equipment is not within the required range, a rectification suggestion should be put forward, and power-on is strictly prohibited
• C.In the case of power failure, you can contact the board without wearing an anti-static wrist or anti-static gloves
• D.After the hardware inspection of the single station is completed, make sure that all power switches are in the off position

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Four network elements form an STM-4 two-fiber bidirectional multiplexing section protection ring. Which of the following is the maximum service capacity on the ring network?

• A.1008 2M
• B.252 2M
• C.63 2M
• D.504 2M

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Regarding electrical layer service configuration, which of the following statements is false?

• A.If there is an Och service path, you can first search for the OTUk path, create the ODUk service layer path, and then create the Client path.
• B.When the Och service path exists, create an OTUk path directly, and the network management can automatically create the OTUk path
• C.When the Och service path exists, directly create the OTUk path, and the network management can automatically create the OTUk and 0DUk paths.
• D.After the logical fiber connection is completed, no path search operation is required, and the OTS path and OMS path can be automatically generated

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The frame rate of STM-1, STM-4, STM-16, STM-64 signals are all the same 8000 frames/sec.

• A.False
• B.True

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