A Next Generation Network(NGN) is a () network ,which is able to provide Telecom
A Next Generation Network(NGN) is a () network ,which is able to provide Telecomunication Services ti users and to make use of multiple broadband, QoS-enable transport technologies and in which service-related functions are (下题选择) of the underlying transport-related technologies.
A.ISDN
B.ATM
C.circuit-based
D.packet-based
正确答案：D
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