A.For device software maintenance, onsite operations are allowed but only remote operations are recommended.

B.The external environment where hardware runs does not need special attention.

C.The device software running is closely related to services running on the device.

D.For device environment maintenance, maintenance personnel need to go to the site or even use some professional tools for observation and measurement.

A.Part model

B.Project name

C.Part number

D.Number of parts

A.Technical review

B.Authorization obtaining

C.Solution formulation

D.Implementation and result feedback

A.Command outputs are correct.

B.Tested network services are running properly.

C.The network is running properly.

D.Tested upper-layer application services are running properly on the network.

A.FC interface

B.SC interface

C.LC interface

D.BNC interface