多项选择题

Which two B-RAS service offerings maintain the analog dial-up model with centralized user authentication，authorization，andaccounting？（）

A.Routed1483
B.Bridged1483
C.PPPoverATM
D.PPPoverEthernet

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单项选择题

A.atm pvc0/33 aal5snap
B.atm pvc33033 aal5snap
C.atm pvc0/33 aal5snap ubr
D.atm pvc33033 aal5snap ubr

单项选择题

A.28.8kbps
B.56kbps
C.128kbps
D.1544kbps

多项选择题

A.line quality
B.distance from the CO
C.brand of xDSL modem
D.number of twisted-pair wires used