The following about DCN network planning, the error is

• A.Huawei transport domain network elements support three communication protocols for DCN networking, among which the HWECC protocol is a private communication protocol developed by Huawei for DCN networking of transport domain network elements.
• B.The IP address of U2000 is 129.9.0.100/24, and the IP address of the gateway NE it manages is 129.9.0.2/24. If the U2000 wants to communicate with a network element with an IP address of 133.168.0.2/24 that is connected to a gateway network element through IP over DCC, the U2000 needs to be directly connected to the gateway network element.
• C.The network management server and each managed network element adopt in-band networking or out-of-band networking for communication. In-band networking refers to the networking mode in which the U2000 uses the service channels provided by the managed devices to manage the devices in the network.
• D.Huawei transport domain network elements all support the HWECC protocol, and the default physical transmission channel is D1 to D12 bytes. When the network element ID is set, the ECC communication can be carried out without any configuration after plugging in the optical fiber.

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The clock ID can solve the problem of timing loops that may occur. In the following networking, in order to completely solve the clock loop, how many clock IDs need to be set?

• A.4
• B.7
• C.6
• D.3

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What are the TDM circuit simulation encapsulation protocols? (multiple choice)

• A.ML-PPP protocol
• B.CESoPSN protocol
• C.SAToP protocol
• D.GFP protocol

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The following descriptions about 1+1 protection and 1:1 protection of MPLS Tunnel are correct (multiple choice)

• A.MPLS Tunnel 1+1 protected service with dual sending and selective receiving, MPLS Tunnel 1:1 protected service with single sending and single receiving
• B.If you want to protect the MPLS Tunnel, you need to create an MPLS Tunnel protection group
• C.MPLS Tunnel 1:1 protection has two types of services: double-ended switching and single-ended switching. MPLS Tunnel 1+1 protection only has single-ended switching.
• D.The APS protocol protected by the MPLS Tunnel 1:1 transfers the protocol status and switching status to each other through the tunnel transmission

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The following are not precautions for preliminary testing:

• A.When testing, be careful not to look directly at the optical transmitter interface, so as not to damage your eyes.
• B.Before the test, check whether the required test wires are complete, the type of connector and the applicability of the instrument and whether the connection is good.
• C.Prepare cotton swabs and alcohol, and pay attention to the cleaning of the connector at all times when testing the optical interface characteristics to ensure the accuracy of the test data.
• D.When performing a 24-hour bit error test, ensure that the entire test process is free from external interference (including human factors and power supply conditions, etc.). If there is an abnormality, the exact time of the abnormality should be recorded or the test should be repeated. The test time does not need to exceed 24 hours.

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