【ciscoccna认证教程】CISCOCCNA认证考试640-810题库原题9
【shitiku.jxxyjl.com--思科试题】
your boss at testking asks you about half-duplex and full-duplex ethernet. what are unique for halfduplex ethernet? (choose two)a. half-duplex ethernet operates in a shared collision domain.
b. half-duplex ethernet operates in a private collision domain.
c. half-duplex ethernet has higher effective throughput.
d. half-duplex ethernet has lower effective throughput.
e. half-duplex ethernet operates in a private broadcast domain.
answer: a d
explanation:
a single device could not be sending a frame and receiving a frame at the same time because it would mean that a collision was occurring. so, devices simply chose not to send a frame while receiving a frame. that logic is called half-duplex logic.
ethernet switches allow multiple frames to be sent over different ports at the same time. additionally, if only one device is connected to a switch port, there is never a possibility that a collision could occur. so, lan switches with only one device cabled to each port of the switch allow the use of full-duplex operation. full
duplex means that an ethernet card can send and receive concurrently.
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