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CCNA 200-301 练习测试与真实考试题库，2026年更新版。适用于思科认证网络助理资格认证考试。

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问题 #1

If only all network elements in a certain subnet are out of management on the network management system, and network elements belonging to other subnets communicate normally, which of the following reasons is impossible?

A. Changing the IP address of the gateway NE by mistake

B. NMS network management failurecorrect

C. Misconnection or failure of optical fiber

D. The network scale is too large, and the scale of ECC communication between network elements exceeds the processing capacity of network elements

正确答案：B

问题 #2

When PWE3 emulates TDM services, when the UNI side interface uses CRC4-multiframe access, which emulation method does PWE3 use?

A. 1 to 1 encapsulation

B. CESOPSNcorrect

C. N to 1 encapsulation

D. SAToP

正确答案：B

问题 #3

In the deployment or expansion scenario, alarm reversal can reverse the alarm state and reduce a large number of unnecessary alarm reports. Which of the following descriptions about alarm reversal is correct?

A. The setting of alarm reversal is based on the channel

B. The setting of alarm reversal is based on the network element

C. The setting of alarm reversal is port-basedcorrect

D. The setting of alarm reversal is based on the board

正确答案：C

问题 #4

When using the dual slot line group MSP ring, which of the following situations is the multiplex section overhead K bytes in the pass-through state?

A. The cross board is abnormal

B. The main control board is abnormal

C. The main control board is not in placecorrect

D. When the status of the multiplex section protocol controller is pass-through

正确答案：C

问题 #5

Regarding the TTX board, which of the following statements is correct?

A. In essence, the TTX board is not a 100G tributary board, but it requires a single-slot 100G crossover capacitycorrect

B. 8800 T64/T32 universal subrack can support TTX single board

C. This board belongs to the tributary board and can access 100G client-side services

D. TTX can do ODU4 particle electrical crossover with NS4

正确答案：A

问题 #6

The clock ID can solve the possible timing loop problem. In the following networking, in order to completely solve the clock loop, how many clock IDs need to be set in total?

A. 3

B. 4

C. 6correct

D. 7

正确答案：C

问题 #7

The essence of QPSK modulation is to select 4 possible values on the optical field phase, so that the baud rate can be reduced by half without reducing the line rate.

A. Truecorrect

B. False

正确答案：A

问题 #8

Which of the following description of the ASON software structure is correct? (Multiple Choice)

A. Intelligent optical network consists of three planes

B. The transmission plane refers to the traditional transmission network.

C. Intelligent software main application management plane

D. Management plane mainly refers to upper management such as network management

正确答案：ABD

问题 #9

SOTU stands for Single Optical Transport Unit Interface, and MOTU stands for Multiple Optical Transport Unit Interface.

A. Truecorrect

B. False

正确答案：A

问题 #10

The path at the GE level is essentially a path at the Client level.

A. Truecorrect

B. False

正确答案：A

问题 #11

If a ROADM site adopts WSS+RMU configuration, which of the following impact on SOM is wrong?

A. If the RMU is used locally to add waves and has an optical amplifier, the OSNR value of the wavelength detected by the SOM in the pass-through direction will deviate from the actual valuecorrect

B. There is an optical amplifier locally but no filter. The full-wave noise of the local optical amplifier affects the OSNR of the wavelength in the pass-through direction.

C. The source and sink optical amplifiers of the optical crossover at this site must be in the same network element

正确答案：A

问题 #12

When configuring the dual-stage amplifier board of RAU+OAU, which position in the figure below is the best recommended position for the DCM module?

A. 1

B. 2

C. 3correct

D. 4

正确答案：C

问题 #13

Which of the following performances do not need to be evaluated when expanding the wavelength division system of the existing network?

A. PMD parameters of the linkcorrect

B. Bit error rate before error correction of OTU at the receiving end

C. Optical power flatness at the receiving end (with MCA configured)

正确答案：A

问题 #14

If the cumulative amount of dispersion exceeds the system's dispersion tolerance, it will cause bit errors at the receiving end.

A. False

B. True

正确答案：B

问题 #15

Ring multiplex section protection utilizes K1 and K2 bytes to transmit switching requests to realize automatic protection.

A. Truecorrect

B. False

正确答案：A

问题 #16

In order to meet the specified synchronization quality requirements, corresponding requirements must be made on the network for synchronous transmission, and the specified networking rules must be followed during network planning. Which of the following is wrong?

A. In one clock transmission direction, the number of stations between the transit office clocks cannot exceed 30correct

B. The number of switching office clocks cannot exceed 10

C. The total number of devices in one direction cannot exceed 60

正确答案：A

问题 #17

Which reason for the OA_LOW_GAIN alarm is wrong?

A. The input optical power of the board is too high

B. The insertion loss between the TDC and RDC optical ports is too large (only for the OAU board)

C. The board that reported this alarm is faulty

D. The gain of the optical amplifier board is set too lowcorrect

正确答案：D

问题 #18

Regarding the reporting of the OTUk_BDI alarm, which of the following statements is wrong?

A. Only the port on the WDM side will report oTUk_BDIcorrect

B. The downstream station receives the OTUk_AIS corresponding to the OTU board

C. The downstream station corresponding to the OTU board receives the OTUk_TIM

D. The downstream station receives the OTUk_SSF corresponding to the OTU board

正确答案：A

问题 #19

Which of the following bytes is the negative adjustment position of the TU pointer?

A. V1

B. V2

C. V3

D. V4

正确答案：C

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