A.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.

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

C.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.

D.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.

A.Bottom-up

B.Configuration comparison

C.Service traffic path check

D.Top-down

A.Exchange rate change

B.Differences of industrial standards

C.Rainstorm disaster

D.Social unrest

A.Run the display current-configuration command to check the PCB version and the software version of a card.

B.Run the display interface interface-type interface-number command in any view to check the status of communication interfaces.

C.Run the display vlan vlan-id command in any view to check whether the VLAN for communication interfaces has been created.

D.Run the display mac-address command on the switch to check MAC address entries including the MAC address, port number, and VLAN ID.

A.WSIC

B.HSIC

C.XSIC

D.SIC