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【单选题】
下列测量值中不是四位有效数字的是A.
10.00毫升
B.
0.1234克
C.
PH值等于10.00
D.
20.10%
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反馈参考答案：
举一反三
【单选题】After enabling port security on a Cisco Catalyst switch， what is the default action when the configuredmaximum of allowed MAC addresses value is exceeded？（）
A.
The port’s violation mode is set to restrict
B.
The port is shut down
C.
The MAC address table is cleared and the new MAC address is entered into the table
D.
The port remains enabled， but bandwidth is throttled until old MAC addresses are aged out
【判断题】When Mac entered the hospital, he was apparently a normal person except for an enduring cough.
A.
正确
B.
错误
【多选题】As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the devicE.For what two reasons can this happen? （）
A.
The data is moving from 10BASE-TX to 100BASE-TX.
B.
The WAN encapsulation type has changed.
C.
The data format has changed from analog to digital.
D.
The source and destination hosts are in the same subnet.
E.
The source and destination MAC addresses have changed.
【简答题】You swim in it.
【多选题】As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the device. For what two reasons can this happen?
A.
The data is moving from 10BASE-TX to 100BASE-TX.
B.
The WAN encapsulation type has changed.
C.
The data format has changed from analog to digital.
D.
The source and destination hosts are in the same subnet.
E.
The source and destination MAC addresses have changed.
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