單項(xiàng)選擇題What protocol enables Ethernet over SONET/SDH encapsulation interoperability between the G-series and ML-series Ethernet cards?()

A. LEX
B. HDLC
C. GFP-F
D. PPP/BCP


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2.單項(xiàng)選擇題What is the difference between 1+1 and 1:1 protection switching?()

A. 1+1 is based on APS, while 1:1 is based on IPS.
B. 1:1 is used in SNCP switching, while 1+1 is used in MS-SPRing switching.
C. 1+1 sends signals on Working and Protect paths, while 1:1 sends signals only on Working path.
D. 1+1 sends signals on Working path ONLY, while 1:1 sends signals on both Working and Protect paths.

4.單項(xiàng)選擇題Which timing mode is most appropriate for an ONS 15454 that has lost its BITS-1 and optical references?()

A. line timing
B. loop timing
C. internal timing
D. through timing
E. external timing

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