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單項選擇題A Channel ID mismatch occurs when （）.

A. fibers are terminated incorrectly on a node
B. the channel number in the received K1 byte is not identical to the channel number transmitted in the K2 byte
C. the channel number in the received C1 byte is not identical to the channel number transmitted in the C2 byte
D. the channel number in the received C2 byte is not identical to the channel number transmitted in the C1 byte
E. the channel number in the received K2 byte is not identical to the channel number transmitted in the K1 byte

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1.單項選擇題The ML-series Ethernet card on the ONS 15454 provides up to （）active Q-in-Q instances per card.

A.255
B.512
C.1024
D.4096

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2.單項選擇題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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3.單項選擇題You are provisioning a DS-1 circuit on an ONS 15454 2F-BLSR with a XC-10G card. Each VT1.5 connection must also terminate via the STS matrix. On the originating circuit node, how many STS ports are now available for VT1.5 circuits?（）

A.2
B.3
C.4
D.20
E.22
F.24

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4.單項選擇題A customer has 2 DS1s to add between adjacent nodes in a UPSR ring. What type of circuit should you recommend?（）

A. VT circuits
B. STS circuits
C. VT tunnel circuits
D. 1:1 protection circuits
E. 1:N protection circuits

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5.單項選擇題 Click the Exhibit button. Given the information shown in the exhibit, when creating 2 DS1 circuits, how many STS ports are used on the VT1.5 matrix at Node 1 as VT circuits and how many are used after using VT tunnels?（）

A.2；0
B.3；2
C.3；5
D.4；0
E.6；0
F.6；2

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