多項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


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1.多項選擇題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.

2.單項選擇題OSI中，哪些不是表示層功能？（）

A.數(shù)據(jù)加密
B.數(shù)據(jù)壓縮
C.密碼控制
D.數(shù)據(jù)格式轉(zhuǎn)換