题目内容
（请给出正确答案）
A.GRE用于对某些网络层协议（如：IP、IPX、AppleTalk等）的数据报进行封装，使这些被封装的数据报能够在IP网中传输
B.GRE是二层隧道协议
C.GRE在网络层之间采用了Tunnel（隧道）的技术
D.GRE是实现VPN所必需的协议
答案
A,C
如果结果不匹配，请 联系老师 获取答案
更多“关于GRE（Generic Routing Encapula…”相关的问题
A.IPSec(Internet Protocol Security extensions)
B.GRE(Generic Routing Encapsulation)
C.MPLS(Multi-Protocol Label Switching)
D.EON(CLNP over IP)
A.封装过程，原始数据包通过查找路由把数据包传递到Tunnel接口后出发GRE封装
B.封装过程，经过GRE模块封装后，此数据包将进入IP模块进行下一步处理
C.解封装过程，目的端收到GRE报文后，通过查找路由把数据包传递到Tunnel接口后出发GRE解封装
D.解封装过程，经过GRE模块解封装后，此数据包将进入IP模块进行下一步处理
A.VPN的本质是利用公网的资源构建企业的内部私网
B.VPN技术的关键在于隧道的建立
C.GRE是三层隧道封装技术，把用户的TCP/UDP数据包直接加上公网的IP报头发送到公网中去
D.L2TP是二层隧道技术，可以用来构建VPDN
A.Committed Access Rate, CAR
B.Generic Traffic Shaping, GTS
C.RED
D.以上都是
A.10 hours after the last periodic location update
B.10 hours after the last power on location update
C.10 hours after the last generic location update
D.10 hours after the last transaction of any kind with the NSS
During the past years, intelligent technology has evolved(116)three generations. The first was characterized by tools such as prolog and OPS. prolog is a simple backward-chaining environment, and OPS is a simple forward-chaining environment. This led to the second generation of knowledge-engineering environments. Its goal was to model, prototype and construct(117)systems.All three generations were oriented toward generic(118)and represented generalized implementation environments for the construction of expert systems. knowledge bases and AI applications.Some of the solution-oriented products are also seamlessly integrated with generic knowledge-engineering environments, permitting end users to add(119) rules and objects, as well as predefined knowledge-based logic to address problems in manufacturing simulation.Marketplace orientation is rapidly(120)toward solution-oriented intelligent product environments. the fourth generation represents a new line of thinking and ' develop-merit by commercial fu-ms. will reduce the cost risk and development time associated with problem solving.
A．custom
B．knowledge
C．through
D．problem solving
