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单选题
In a DSL network，which device terminates the PPP over Ethernet subscriber’s two-wire phone line？（）
A
RAS
B
DSLAM
C
ATMswitch
D
RADIUSserver
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单选题What will significantly degrade DSL performance， regardless of DSL rate or line length？ （）A
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DSLAMB
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单选题A user is connected on a DSL line and is using a PPP over Ethernet service. Which network device encapsulates the datagram inside of an ATM header?（）A
DSLAMB
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to provide VPN access over L2TPB
to enable PPP session from the router to the termination device at the headend for metro Ethernet connectivityC
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for connecting the router to a cable modem, which bridges the Ethernet frames from the router to the cable modem termination system
考题
单选题In a DSL network，which device terminates the PPP over Ethernet subscriber’s two-wire phone line？（）A
RASB
DSLAMC
ATMswitchD
RADIUSserver
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