In the L2TP networking, there are three ways for LNS to authenticate users: proxy authentication, mandatory CHAP authentication and LCP renegotiation.The highest priority is ____ .

• A.on behalf of the agent authentication
• B.Strong system CHAP authentication
• C.LCP renegotiation
• D.All the same

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Which of the following descriptions of the traditional telephone system is correct is ____ .

• A.electrically telephone subscriber loop connected by the PBX or central office switches, are connected to the telephone subscriber loop and the PBX a line between the pair, including tip and Ring , wherein Tip ground, Ring then PBX negative electrode.
• B.electrically telephone ringing tone by the remote PBX providing a voltage or central office switches completed, the dial tone is provided by the telephone set voltage accomplished.
• C.electrical telephones and facsimile machines belong to the FXS ordinary telephone devices can be connected to a central office switch via an ordinary telephone line FXO interface.

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In the basic configuration of L2TP in independent LAC mode , the description of the tunnel verification function is correct.

• A.tunnel channel request can not be verified by the LNS initiated
• B.lack of provincial cases, tunnel authentication is disabled
• C.tunnel channel request can be verified by the LAC initiated
• D.lack of provincial cases, tunnel authentication is enabled.

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Which of the following statements about the access network is correct is _____

• A.The access network can also be Ethernet
• B.access network typically includes a user transmission system, terminal multiplexers or network,
• C.Compared with backbone network, access network is often the bottleneck of network transmission speed
• D.access into generally refers to the connection between the user and the network operator of the network close to the user central office

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Common VPI/VCI values in ADSL applications include ____ .( Choose one or more )

• A.0/35
• B.0/32
• C.0/16
• D.0/30

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