單項(xiàng)選擇題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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1.多項(xiàng)選擇題下列哪些接口可作邏輯通道？（）

A.X.25
B.幀中繼
C.dialer
D.同/異步串口

2.多項(xiàng)選擇題What are some of the advantages of using a router to segment the network?（）

A.Filtering can occur based on Layer 3 information.
B.Broadcasts are eliminated.
C.Routers generally cost less than switches.
D.Broadcasts are not forwarded across the router.
E.Adding a router to the network decreases latency.