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單項選擇題

Which MQC-based output queueing method is designed to support multiple traffic classes including VoIPtraffic， mission-critical traffic， bulk traffic， interactive traffic and default class traffic？（）

A.Custom Queueing
B.CB-WRED
C.WRR Queueing
D.LLQ
E.CBWFQ

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單項選擇題

What is the port number of an IPsec Encapsulating Security Payload packet？（）

A.IP protocol 50
B.IP protocol 51
C.TCP port 50
D.TCP port 51
E.UDP port 50
F.UDP port 51

多項選擇題

In PPPoA architecture， which two methods are most commonly deployed？（）

A.terminating PPP sessions at the service provider
B.PPP framing
C.PPP multiplexing
D.GRE tunneling
E.L2TP tunneling

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