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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
更多“关于GRE（Generic Routing Encapulation）协议的说法哪些是正确的（）”相关的问题
第2题
从供选择的答案中，选出最确切的解答。
SOCKS is a generic proxy protocol for ICP/IP-based networking, applications. SOCKS includes two(1), the SOCKS server and the SOCKS client. The SOCKS server is implemented at the application layer. The SOCKS client is implemented between applications and the(2)layer. When an application client needs to connect to an application server, the client connects to a SOCKS proxy server. The proxy server connects to the application server instead of the client, and(3)data between the client and the application server. For the application server, the proxy server is the(4). SOCKS is also one of the popular(5)to network firewalls. Because of its simplicity and flexibility, SOCKS has been used as generic application proxy in virtual private network (VPN), and for extranet applications.
第8题
选出应填入下面一段英语中______内的正确答案。
During the past years, intelligent technology has evolved(1)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(2)systems.
All three generations were oriented toward generic(3)and represented generalized implementation environments for the construction of expert system, knowledge based and AI applications.
Some of the solution-oriented products are also seamlessly integrated with generic knowledge-engineering enviroments, permitting users to add(4)rules and objects, as well as predefined knowledge-base logic to address problems in manufacturing simulation.
Marketplace orientation is rapidly(5)toward solution-oriented intelligent product environments. The fourth generation represents a new line of thinking and development by commercial firms will reduce the cost, risk and development time associated with problem solving.
供选择的答案：
(1) software (2) custom (3) control (4) having
(5) shifting (6) search (7) database (8) knowledge
(9) after (10) through (11) problem solving (12) by
第9题
g to your GRE score， but also according to your _______ in college.
A.performance B.policy C.smart D.statement
