Which of the following description of the evolutionist in the mainstream SDN model in the industry is correct? (Multiple Choice)

• A.Try to preserve and reuse existing routing protocols and IP network technologies
• B.Make full use of existing equipment and achieve fast
• C.Device programmable, open northbound API interface
• D.Control flexibility is moderate and open is not complete

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If the tunnel APS is configured for the tunnel to which the PW belongs, the PW cannot be configured with the PW APS.

• A.FALSE
• B.TRUE

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In WDM transmission systems, the main factors affecting the unevenness of power balance of each channel which are not included? (Multiple choice)

• A.EDFA gain unevenness
• B.The main channel dimming fader setting is unreasonable
• C.Cable aging is high
• D.Non-uniformity of insertion loss of each channel of the multiplexer/demultiplexer

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Which of the following statements about the advantages of OTN are wrong?

• A.OTN provides up to five levels of nested or overlapping TCM connection monitoring.
• B.OTN provides high-speed interfaces of 2.7 Gbit/s, 10.7 Gbit/s, 43 Gbit/s and even 111.8 Gbit/s.
• C.WDM function is used to meet the requirement of Tbit/s bandwidth per fiber.
• D.OTN provides powerful out-of-band FEC function to effectively ensure line transmission performance.

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The overhead ratio is a factor that affects the error correction capability of FEC technology. Generally, under the same FEC encoding/decoding algorithm, the higher the overhead ratio, the greater the net coding benefit.

• A.FALSE
• B.TRUE

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