NGN(Next Generation Network)的体系结构中分为接入层 传送层 控制层 业务层四个层次 完成资源管理 用户认证的为 ( )

A Next Generation Network（NGN) is a （) network ,which is able to provide Telecomunication

A Next Generation Network（NGN) is a （上题选择) network ,which is able to provide Telecomun

The details of any language system are passed on from one generation to the next through _

FTTX位于NGN网络体系的结构中的（)。A.业务管理层B.网络控制层C.边缘接入层D.核心交换层

IPv6 is short for“Internet Protocol Version 6”．IPv6 is the “next generation” protocol des

The details of any language system are passed on from one generation to the next through _