HCIP 2.1

Which of the following effects is used by Raman amplifiers?

• Self-phase modulation (SPM)

• Dispersion

• Stimulated Raman scattering (SRS)

• Four-wave mixing (FWM)

Which of the following services has the shortest frame period?

• ODU0

• ODU1

• ODU2

• ODU3

Which of the following combinations cannot implement dynamic wavelength grooming.

• WSD9+WSM9

• RDU9+RMU9

• WSMD4

• DWSS20

Which of the following protection schemes supports ODUflex as the grooming granularity of a line board?

• ODUk SNCP

• SW SNCP

• ODUk ring network protection

• Tributary SNCP

If the mask of an IP subnet is 27 bits, how many hosts does the subnet have?

• 16

• 32

• 14

• 30

ln basic network configuration scenarios, performance events can be queried only after the NE performance monitoring function is enabled. Which of the following statements about setting the NE performance monitoring function is true?

• The start time must be later than the current time of the NMS and NE.

• The start time can be earlier than the current time of the NMS and NE.

• If the end time is not set, the performance monitoring function is automatically disabled after 15 minutes or 24 hours by default.

• The end time must be set.

Coarse wavelength division multiplexing (CWDM) is generally used in systems whose distance does not exceed ( ).

• 50 km

• 100 km

• 200 km

• 20 km

Which of the following statements does not comply with the cable routing specifications?

• The bending radius of optical fibers is greater than or equal to 40 mm.

• Power cables, ground cables, and signal cables outside the cabinet are routed separately and 30 mm apart from one another.

• The bending radius of cables should be as large as possible (greater than 60 mm), and the cables should be bound at turning points.

• The distributed -48 V power cable is blue, the ground cable is black, and the PGND cable is yellow or yellow-green.

When all NEs in a subnet are unreachable by the NMS, but NEs in other subnets are reachable, which of the following is not a possible cause?

• Optical fibers are incorrectly connected or faulty.

• The NMS is faulty.

• The IP address of the gateway NE is changed incorrectly.

• The network scale is too large, and the ECC communication between NEs exceeds the NE processing capability.

WDM systems generally use DCMs to compensate for chromatic dispersion. Which of the following statements about DCM-based dispersion compensation is false?

• Compared with line transmission optical fibers, DCMs are prone to non-linear effects. Therefore, the incident optical power of the DCMs must be controlled.

• For a 10G system with a fiber length shorter than 400 km, G.652-specific DCMs can be used to compensate for dispersion in G.655 (Leaf) optical fibers.

• If the DCM configuration is incorrect, the system OSNR will deteriorate.

• If the DCM configuration is false, the receive-end performance will deteriorate.