单项选择题

What does UDLD stand for？（）

A.UniDirectional Loop Detection
B.Unspecified Distribution Label Detection
C.Unified Distribution Label Direction
D.UniDirectional Link Detection

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单项选择题

What will significantly degrade DSL performance， regardless of DSL rate or line length？（）

A.Microliters installed between a telephone and shared line
B.POTS splitters at the subscriber’s end of the DSL line
C.POTS splitters at the telco CO
D.None of the other alternatives apply

单项选择题

ATM carries IP and PPP information with ATM cells. What ATM adaptation Layer is used when an ATMcell carries IP packets and PPP frames？（）

A.AAU2
B.AAL3
C.AAL4
D.AAL5

多项选择题

Which two of the following are designated fields for MAC tunneling protocol（802.1 ah）？（）

A.Service Ethertype
B.ISL
C.PseudoLAN TAG
D.802.1q VLAN TAG
E.Control Word
F.Tunnel Label