An operator hopes to deploy ADSL ( ADSL2 ) to kill the system in a community with relatively dense users and short transmission distance .Users do not require high bandwidth, and pay more attention to its economy and ease of installation and maintenance.
Based on the above requirements, when choosing ADSL ( ADSL2 ) standard, the ideal is ____ .( Choose one or more )

• A.ITU 992.3
• B.ITU 992.4
• C.ITU 992.2
• D.ITU 992.1

Comment: *

Name: *

Email: *

Verification: *

There are ___ methods for user access authentication and authorization .

• A.CA certification and authorization
• B.This authenticated authorization
• C.HWTACAC authentication and authorization
• D.RADIUS authentication and authorization

Comment: *

Name: *

Email: *

Verification: *

In the ONU registration process, comprising L the LID ( the Logical Link ID , Logical Link Flags ) control message comprises information ____ .( Choose one or more )

• A.hair now GATE
• B.Register_Req
• C.Register Ack
• D.Report
• E.P through GATE
• F.Register

Comment: *

Name: *

Email: *

Verification: *

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

• A.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.
• B.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.
• C.electrically telephone subscriber loop access through the PBX or central office switches, are connected to the telephone subscriber loop and the PBX a line between the pair comprising TiP and Ring , wherein TiP ground, Ring then PBX negative electrode.

Comment: *

Name: *

Email: *

Verification: *

In the GRE encapsulation of IP over IP , the hexadecimal value of the Protocol Tpe field of the GRE header is Ox____ .( Fill in 16 hexadecimal digits )

• A.0800

Comment: *

Name: *

Email: *

Verification: *