Data encryption.
User authentication.
Transparent data conversion
Configuration and administration mechanisms.
Support for multiple network transport protocols.
第1题：
A Next Generation Network(NGN) is a (上题选择) 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 () of the underlying transport-related technologies.
A.dependent
B.independent
C.related
D.depend
第2题：
A. Defines the network topology
B. Access to network resources
C. Routing and switching functions
D. Content Filtering
E. Intrusion Detection
第3题：
The X.25 standard specifies three layers of functionality.Which layers of the OSI model correspond to the X.25 layers?
A．the Physical, Network, and Session Layers
B．the Physical, Data Link, and Network Layers
C．the Physical, Data Link, and Transport Layers
D．the Physical, Session, and Presentation layers
第4题：
Which three of the following basic network services are provided by the Cisco IOS?（）
第5题：
Which three components comprise the AVVID framework？（）
第6题：
A. The application layer
B. The session layer
C. The data link layer
D. The transport layer
E. The network interface layer
F. The physical layer
第7题：
A. IP telephony
B. security
C. IP multicasting
D. QoS
第8题：
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
第9题：
Which three are features of the integrated services routers?（）
第10题：
Which three of the following OSI model layers also belong to the TCP/IP model?（）