A.Authentication

B.Dead

C.Network

D.Establish

E.Terminate

A.If two stations start transmitting at the same time, they will hear the signal conflict and pause the frame transmission.

B.CSMA/CD is applied in bus-type Ethernet, mainly to solve the problem of how to detect conflicts and ensure orderly transmission of data when multiple stations send data at the same time.

C.The station can start transmitting its frame only when the channel is free.

D.When a station connected to the Ethernet wants to transmit a frame, it must wait until the channel is free, that is, the carrier disappears.

A.3

B.5

C.2

D.1

A.hybrid port

B.trunk port

C.monitor port

D.access port

E.Mirror port

A.In an environment where the complex interaction between the client and the server is not convenient, you can use TFTP to upgrade

B.When using FTP to upgrade, the device can be used as an FTP server or client

C.When the device cannot boot to the command line mode and needs to upgrade the operating system software, Xmodem and TFTP can be used

D.Use Xmodem to upgrade to the same speed as FTP