Regarding system security planning and reliability planning, which of the following is correct (multiple choice)

• A.Based on security considerations, the recommended communication bandwidth for medium-scale remote dual-system hot backup communication is 2M.
• B.Operational safety and reliability design includes: access control, ACL control, time control, limit on the number of logins, user monitoring and operation confirmation.
• C.In the process of data output, to ensure the security of data transmission, U2000 needs to support data encryption protocol, in which SSLv3 protocol can be used for data transmission encryption between U2000 and network element equipment, and it can also be used for U2000 and upper OSS system Data transmission between is encrypted.
• D.The security management of the network management mainly includes object management, password management, access control management, and power and domain management.

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Regarding the OSNR test of the OTN system, which of the following statements is correct? () (multiple choice)

• A.The out-of-band noise interpolation method refers to inserting the noise of the instrument to replace the actual noise of the system
• B.When using OSA to test OSNR, because the noise in the signal band cannot be directly tested, the out-of-band noise interpolation method is adopted to calculate the noise in the band
• C.After the wavelength signal passes through a filter device such as D40, the noise power between channels will be reduced, so the OSNR value of the traditional OSA test is higher
• D.The integral method test OSNR is also called the turn-off method, and the channel business will be interrupted during the test. And in the case of a small number of waves, the OSNR value measured by the integral method has a certain deviation from the true value
• E.OptiX OSN8800/6800 equipment MCA online test 100G wavelength OSNR also uses the shutdown method
• F.The 40G and 100G wavelengths overlap due to the signal spectrum, and the OSNR value tested by the traditional OSA test method is low

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The ring network of the OSN6800 equipment group was newly opened, and ODU1-SNCP/N protection was enabled. The engineer reported that a switch occurred one day and has not been restored, but there is no problem with the optical cable. There is an ODU_SNCP_PS alarm on the corresponding ND2 optical port. The possible reasons are:

• A.There is a minor alarm ODU1_PM_LCK on the relevant circuit board;
• B.The PM overhead of the related circuit board is set to "LCK Insert" as enable
• C.Related circuit board failure;
• D.The business configuration is wrong, or there is redundant business crossing at the business source and sink;

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The GXCS single board of the OptiX OSN3500 equipment is upgraded to SXCS. In the case of active/standby configuration, the business will be interrupted during the upgrade process.

• A.FALSE
• B.TRUE

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In the Ethernet service OAM, the name of the node that can initiate the OAM operation is

• A.MEP
• B.MA
• C.MIP
• D.MD

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