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  3. The Ezonexam network administrator needs to determine what LAN devices to install on the Ezonexam network. What are two advantag

The Ezonexam network administrator needs to determine what LAN devices to install on the Ezonexam network. What are two advantag

admin2009-05-19  54
问题 The Ezonexam network administrator needs to determine what LAN devices to install on the Ezonexam network. What are two advantages of using Layer 2 Ethernet switches over hubs? (Choose two)
选项 A、Allowing simultaneous frame transmissions
B、Increasing the size of broadcast domains
C、Increasing the maximum length of UTP cabling between devices
D、Filtering frames based on MAC addresses
E、Decreasing the number of collision domains
答案A,D
解析 Explanation:
A: A half duplex connection is where only one device can send or receive at a time. A full duplex connection is where both devices can send and receive at the same time. Thus, if you have a 100Mb half-duplex connection, only sending at 100Mb OR receiving at 100Mb can happen at the same time. If you have a 100Mb full duplex connection, you can effectively get 200Mb out of the link because you could be sending 100Mb and receiving 100Mb at the same time.

D: Switches are capable of filtering frames based on any Layer 2 fields. For example, a switch can be programmed to reject (not forward) all frames sourced from a particular network. Because link layer information often includes a reference to an upper-layer protocol, switches usually can filter on this parameter. Furthermore, filters can be helpful in dealing with unnecessary broadcast and multicast packets.
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