單項(xiàng)選擇題IP地址與它的掩碼取反相與，所得的非零點(diǎn)分十進(jìn)制數(shù)是此IP地址的（）。

A.A類(lèi)
B.主機(jī)地址
C.網(wǎng)絡(luò)地址
D.解析地址


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1.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

2.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