A.Authorization obtaining

B.Implementation and result feedback

C.Solution formulation

D.Technical review

A.Interface OSPF MTU configuration is different

B.Neighbors have the same Router ID

C.The 0SPF network types at both ends of the link are inconsistent

D.The link works abnormally

A.When the grounding mode and the grounding resistance are checked, the working ground, protection ground, and building lightning protection ground should be separately configured in the equipment room.

B.It is recommended that power cables and service cables be placed together in a neat and orderly manner.

C.Devices should be placed stably in flat positions in a ventilated and dry environment, and only a few sundries can be placed around the devices.

D.For energy saving, the current temperature and humidity in the equipment room must meet requirements of devices. Air conditioners are not required to run continuously and stably.

A.ISDN

B.ATM

C.MSTP

D.X.25

E.PSTN

A.Risk impact scope

B.Key risk positions

C.Risk impact time

D.Loss caused by risks