39. While troubleshooting a connectivity problem, a network administrator notices that a port status LED on a
Cisco Catalyst series switch is alternating green and amber. Which condition could this indicate?
A. The port is experiencing errors.
B. The port is administratively disabled.
C. The port is blocked by spanning tree.
D. The port has an active link with normal traffic activity.
Answer: A
解释:首先可以根据排除法来看这题,答案B说接口被关闭了,那么不应该会有灯亮,答案B说被
STP block了,那么灯应该是橙色的,答案D说端口正常,那么灯应该是绿色,所以BCD都不对,
那么只有A是对的了
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