單項選擇題

In order to avoid misconnections due to a failed node in an MS-SPRing， Alarm Indication Signals （AISs） are sent on every channel normally terminating in that node. 
What is the name of this process？（）

A. bridging
B. switching
C. squelching
D. nodal bypass
E. node failure insertion


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1.單項選擇題Which timing mode is appropriate for an SDH NE that is adjacent to an SDH NE Bits-1 timing？ （）

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

2.多項選擇題Which two can be transported in one AU-4？ （）

A. 3 E3
B. 4 E4
C. 64 E1
D. 21 E1 and 2 E3
E. 42 E1 and 2 E3

3.單項選擇題How is SNCP and MS-SPRing traffic rerouted during a protection switch when a complete fiber cable cut occurs？（）

A. SNCP traffic is switched from the first node that recieves the AIS.  MS-SPRing traffic is rerouted from the first in the ring.
B. SNCP traffic is selected at the destination node in the ring.  MS-SPRing is rerouted from the originating node in the ring.
C. SNCP traffic is rerouted from the originating node in the ring. MS-SPRing traffic is rerouted from the originating node in the ring.
D. SNCP traffic is selected at the destination node in the ring. MS-SPRing traffic is rerouted from the last reachable node in the ring.

4.單項選擇題A VC-4-4c consists of （）.

A. an STM-16
B. any four VC-4s
C. four contiguous VC-4s
D. four contiguous STM-4s
E. two groupings of four VC-4s

5.單項選擇題On an ONS 15454 node you can tunnel a（n） （）.

A. SDH circuit over a SONET network delivering it as an SDH signal
B. SDH circuit over a SONET network delivering it as a SONET signal
C. SONET circuit over an SDH network delivering it as an SDH signal
D. SONET circuit over an SDH network delivering it as a SONET signal

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