[单项选择]Scrambling of SONET signals is done to （）.
A. prevent the leakage of external fiber emissions
B. provide the optical network with the highest level of security possible
C. assure an even distribution of 1's and 0's for extended transmitter life
D. assure an adequate number of transitions for clock recovery at the receiver
E. prevent the receiver from assuming AIS inadvertently when all 0's are received

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[多项选择]SONET Path Terminating Equipment (PTE) requires which three line codes to be supported for DS1 and DS3 circuits?（） (Choose three.)
A. AMI
B. ESF
C. DUS
D. SSM
E. B3ZS
F. B8ZS

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[单项选择]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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[多项选择]Which three SONET network elements are used for troubleshooting?（）
A. line
B. path
C. circuit
D. section
E. segment

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[多项选择]If a SONET/SDH interface transmit link fails between two JUNOS devices, which two alarms or defects would be seen on those devices?（）
A. LOS
B. REI
C. BIP-B3
D. RDI

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[单项选择]Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?（）
A. DUS
B. line timing
C. loop timing
D. internal timing
E. through timing

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[单项选择]SONET Code Violations (CVs) totals in the PM tables are actually an accumulation of the number of （）.
A. J0 errors detected in a specified interval
B. errors detected in a given Errored Second (ES)
C. errors detected in a given Severely Errored Second (SES)
D. errors the encryption algorithm detects in a specified interval
E. Bit Interleaved Parity (BIP) errors detected in a specified interval

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[单项选择]What can be done has been done．
A. 可以做的事都已经做了。
B. 能做的事情都已做了。
C. 能够做完的事都已经做完了。
D. 什么事还能做呢，都已经做完了。

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[多项选择]与传统SDH和SONET设备相比，OTN的优势有？
A. 更强的针对E1业务的仿真能力
B. 更强的前向误码纠正（FEC）能力
C. 6级的串联连接监视（TCM）
D. 能够对客户信号进行数据包头的分析

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[单项选择]A SONET network typically uses which of the following transmission media?（）
A. Single-mode fiber
B. Multimode fiber
C. Copper
D. Wireless

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[单项选择]ITU-T 接受了 SONET 的概念，将其重新命名为（）。
A. ATM
B. DDN
C. PDH
D. SDH

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[单项选择]Which of the following observations signals the onset of puberty in male adolescents
A. Appearance of pubic hair.
B. Appearance of axillary hair.
C. Testicular enlargement.
D. Nocturnal emissions.

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[单项选择]According to Johansson, the signals influencing women's individual decisions are ______.
A. political
B. private
C. social
D. educational

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[单项选择]Without signals from navigation satellites, the in-car computer

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[单项选择]Nerve signals may travel through nerve or muscle fibers at {{U}}speeds{{/U}} as high as two hundred miles per hour.
A. velocities
B. impulses
C. ratios
D. atrocities

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