HCNA-Transmission

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Question 1:

The EPL service exclusively uses bandwidth on the line, which is highly secure. It is applicable to the private line application of VIP customers.

A. TRUE

B. FALSE

Correct Answer: A


Question 2:

Which of the following operations may interrupt NE services? (Multiple Choice)

A. Searching for protection subnets

B. Searching for trails

C. Deactivating trails

D. Downloading NE data

Correct Answer: CD


Question 3:

Which of the following statements about U2000 license is incorrect?

A. Each license file corresponds to the equipment serial number (ESN) of one U2000 computer, and therefore can be used only on the corresponding computer.

B. Formal U2000 license varies depending on operating system platforms. You must apply for a U2000 license based on the specific operating system.

C. The U2000 license file is named in the “xxxxxxx.dat” format.

D. Do not modify license files. Otherwise, the license files will fail.

Correct Answer: B


Question 4:

Which of the following is not a condition for triggering multiplex section protection (MSP)?

A. The MS-AIS signal is detected.

B. AU-AIS is detected.

C. R-LOS is detected.

D. R-LOF is detected.

Correct Answer: B


Question 5:

Which of the following are communication quality alarms? (Multiple Choice)

A. Optical port loopback

B. No login of an NE user

C. NE communication interruption

D. Loss of optical signals

Correct Answer: CD


Question 6:

Only one TCM can be used at a site.

A. TRUE

B. FALSE

Correct Answer: B


Question 7:

Which of the following is the frame structure of STM-16?

A. 9*270*1

B. 9*270*4

C. 9*270*16

D. 9*270*64

Correct Answer: C


Question 8:

A MAC address consists of 48 bits and is globally unique. Which of the following is the meaning of the MAC address whose eighth bit is 1?

A. Unicast address

B. Bicast address

C. Multicast address

D. Broadcast address

Correct Answer: C


Question 9:

Which of the following is the function of TCM overheads in ODUk signals?

A. Channel supervisory overhead

B. Path trace identifier overhead

C. Tandem connection monitoring overhead

D. General communication channel overhead

Correct Answer: C


Question 10:

Outband networking requires higher costs than inband networking, but provides more reliable management channels.

A. TRUE

B. FALSE

Correct Answer: A


Question 11:

Which of the following statements about an MSP ring are correct? (Multiple Choice)

A. The number of nodes on an MSP ring cannot exceed 16.

B. When creating a protection subnet, select SDH NEs only. Do not select REG or WDM NEs.

C. When multiple protection subnets occupy the same port on the same board, you must select “Resource Sharing”.

D. “Assigned by VC4” means that different VC4s are assigned to different protection subnets to achieve MSP only in some channels.

Correct Answer: ABCD


Question 12:

When the LCAS function is used/ which of the following overhead bytes are used to transmit control information? (Multiple Choice)

A. M1

B. H4

C. K2

D. K4

Correct Answer: BD


Question 13:

According to ITU-T recommendations, the requirement that the MSP switching time should be within 50 ms is conditional. For example, the number of NEs on an entire ring network is less than 16.

A. TRUE

B. FALSE

Correct Answer: B


Question 14:

The frame period of OTN signals is fixed, which is the same as that of SDH signals.

A. TRUE

B. FALSE

Correct Answer: B


Question 15:

Which of the following statements about the 1 1 protection of cross-connect boards are correct? (Multiple Choice)

A. The source service board sends services to the active and standby cross-connect boards.

B. After service cross-connections are completed, the active and standby cross-connect boards send the data of the active cross-connect board to the sink service board.

C. The sink service board can receive only the data from the active cross-connect board.

D. The buses of the two cross-connect modules work independently and do not interfere with each other.

E. The dual-bus system structure indicates that the service board performs dual feeding of data to the cross-connect side and selective receiving of the data on the cross-connect side.

F. Two cross-connect boards have the same configuartion. Service boards will selectively receive services from one of them based on the quality of services and status of cross-connect boards.

Correct Answer: ADEF