单项选择题

Under which circumstance will a branch ISR router contain interface vlan configurations?（）

A. performing inter - VLAN routing
B. performing 802.1Q trunking
C. performi ng ISL trunking
D. Ethernet Switch Module installed
E. ADSL WIC installed
F. running Call Manager Express

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What is the international standard for transmitting data over a cable sys tem?（）

A. PPPoE
B. DOCSIS
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单项选择题

What is the purpose of configuring the router as a PPPoE client?（）

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C. for DSL connectivity and removing the need for the end - user PC to ru n the PPPoE client software
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Which DSL encapsulation method requires client software running on the end - user PC that is directly connected to a DSL modem?（）

A. PPPoA
B. PPPoE
C. PPP
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E. ATM