单选题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（）。AThe port is experiencing errorsBThe port is administratively disabledCThe port is blocked by spanning treeDThe port has an active link with normal traffic activity
单选题
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
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