A.To ensure the stable running of network devices, you are advised to upgrade the device software in a timely manner.

B.Before performing a major upgrade or complex upgrade operations, you need to conduct commissioning and test the upgrade plan and contingency plan in the simulation environment.

C.Generally, the device software upgrade does not affect the stable network running. Therefore, risk assessment and avoidance are not required before the upgrade.

D.The upgrade only causes service interruption for a very short time. Therefore, you do not need to confirm with the customer about the upgrade, improving efficiency.

A.Survey the service traffic path planning in the network design phase.

B.Check the service traffic path at the data link layer.

C.Check the service traffic path at the network layer.

D.Check the fault frequency.

A.FALSE

B.TRUE

A.Line lease expenses

B.Line construction expenses

C.Energy expenses

D.Equipment depreciation expenses

E.Staff expenses

A.Routine maintenance has high technical requirements for operators but no high requirements for operation standardization.

B.Network maintenance is not just a technical issue but also a management issue.

C.Routine maintenance is a preventive measure.

D.Through routine maintenance, administrators can obtain the network baseline, laying a good foundation for troubleshooting.