CISCOCCNA认证考试640-810题库原题9
添加时间: 2007-9-8 23:18:29 作者: Cisco考试认证 阅读次数:39 来源: http://www.d9soft.com
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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