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Share some HCNA-Transmission H31-311-ENU exam questions and answers below.
Currently the most used is the 2Mbit/s signal, which of the following steps are involved in the process of 2Mbit/s signal multiplexing into the STM-N? (Multiple choice) 
A. Rate adaptation 
B. Add a pointer 
C. add the section overhead 
D. Scrambling code 
Answer: ABC

Dispersion coefficient is the delay inequality generated by optical wavelength signal in the unit wavelength interval through the unit length of optical fiber, then which of the following is unit of the dispersion coefficient? 
A. ps/nm 
B. ps/km 
C. ps/nm.km 
D. ps/km.nm 
Answer: C

When the PM segment of the ODUk generates a serious errored second, the network administrator will report ODUk_PM_ES alarm. 
A. True 
B. False 
Answer: B

The U2000 client supports installation on Windows, Solaris and SUSE Linux operating systems. 
A. True 
B. False 
Answer: B

Which of the following situation happens, the ODUk_PM_DEG alarm is reported on the network management? 
A. The error code of the PM segment in ODU layer exceeds the limit; the number of error codes exceeds the threshold of the specified error codes excess 
B. The error code of the PM segment in ODU layer is degraded, the number of error codes exceed the threshold of the specified error degradation 
C. The signal in ODUk TCMn layer is degraded, the number of error codes exceed the threshold of the error code excess 
D. The error code in ODUk TCMn layer exceeds the limit, the number of error codes exceed the threshold of the specified error degradation 
Answer: B

For the slot settings of the OSN 6800 sub-rack, which of the following description is wrong? 
A. IU19, IU20 slot is fixed for the insertion of the power access board PIU, each PIU can independently support sub-rack power supply 
B. IU9, IU10 slots can be used for cross-connect board XCS, each XCS can independently support the business cross among all the slots 
C. IU17 slot, under the situation of un-configuring the SCC, can insert the OTU board to provide service cross-function 
D. IU17, IU18 slots can be used for the main control board SCC, each SCC can independently support sub-rack management 
Answer: C

Compared with the traditional SDH and SONET equipment, which of the following advantages does OTN have? (Multiple choice) 
A. by wavelength division functions meet the demand of each light Tb/s transmission bandwidth 
B. Provide 2.7Gb/s, 10.7Gb/s, 43Gb/s or even 111.8Gb/s high-speed interface 
C. Provide TCM connection monitoring with up to 5 level nested overlaps 
D. Support virtual concatenation transmission mode to improve and optimize the network structure 
E. provide a strong out-of-band FEC function, effectively guarantee the line transmission performance 
Answer: ABDE

Which of the following statement about optical amplifiers and regenerators are correct? (Multiple choice) 
A. regenerator cost is higher 
B. regenerator works at the occasion of a specific bit rate and in a specific frame format 
C. amplifier can work at the occasion of any bit rate and frame format 
D. Optical amplifier is less used, the regenerator is used universally 
Answer: ABC

Complex flow classification refers to classifying packets according to the ToS (Type of Service) field of the IP packet, the user priority, or the EXP field of the MPLS packet, to identify the flow with different priority characteristics. 
A. True 
B. False 
Answer: B

OSN 3500 branch business ability is strong, with 16 branch line slots, single sub-rack has 504 2M, 32 E4, 117 E3/DS3, and 132 STM-1e, providing STM-1/4/16/64 group rate. 
A. True 
B. False 
Answer: A

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