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【判断题】
高合金钢既具有良好的淬透性，又具有良好的淬硬性。A.
正确
B.
错误
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反馈参考答案：
举一反三
【多选题】With regard to bridges and switches, which of the following statements are true?（）
A.
Switches are primarily software based while bridges are hardware based.
B.
Both bridges and switches forward Layer 2 broadcasts.
C.
Bridges are frequently faster than switches.
D.
Switches typically have a higher number of ports than bridges.
E.
Bridges define broadcast domain while switches define collision domains.
F.
Both bridges and switches make forwarding decisions based on Layer 2 addresses.
【简答题】急性毒性试验一般观察时间是（ ）。
【多选题】Bridges and switches are Layer 2 devices that provide the same basic functionality but that also have some differences. Which two traits apply to switches only？（）
A.
supports Layer 2 VLANs
B.
segment LANs
C.
are faster because forwarding decisions are made on hardware
D.
typically have fewer ports because forwarding decisions are made in software
E.
flood frames out all ports
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