Which two B-RAS service offerings do not require user authentication?（）

单项选择题Which protocol is used between the RAS and the authentication server in a narrowband network environment？（）

A.RADIUS
B.PPPPAP
C.MSCHAP
D.PPPCHAP

多项选择题Which two forms of DSL connectivity provide the same bandwidth in both directions？（）

A.ADSL
B.HDSL
C.SDSL
D.RADSL

单项选择题You would like toconfigure an ATM PVC with a virtual circuit identifier of 33 on virtual path 0.The PVC should use an unspecified bit rate and be encapsulated in the AAL5SNAP format. Which command accomplishes this goal?（）

A.atm pvc 0/33 aal5snap
B.atm pvc 33 0 33aal5snap
C.atm pvc 0/33 aal5snap ubr
D.atm pvc 33 0 33 aal5snap ubr

单项选择题Which configuration command creates a virtual router called isp-1？（）

A.virtual-routerisp-1
B.virtual-routerISP-1
C.virtual-routerVRisp-1
D.virtual-routerVRISP-1

单项选择题Your ERX router is supporting 100 virtual routers. A specific line module supports IP interfaces in 5 virtual routers.How many routing tables are maintained on that module?（）

A.0
B.1
C.5
D.100