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中原工学院信息商务学院毕业设计（论文）译文专用纸 第 21页
A global area network (GAN) is a network used for supporting mobile communications across an arbitrary number of wireless LANs, satellite coverage areas, etc. The key challenge in mobile communications is handing off the user communications from one local coverage area to the next. In IEEE Project 802, this involves a succession of terrestrial wireless LANs.[7] Internet
The Internet is a global system of interconnected governmental, academic, corporate, public, and private computer networks. It is based on the networking technologies of the Internet Protocol Suite. It is the successor of the Advanced Research Projects Agency Network (ARPANET) developed by DARPA of the United States Department of Defense. The Internet is also the communications backbone underlying the World Wide Web (WWW). Intranets and extranets
Intranets and extranets are parts or extensions of a computer network, usually a local area network.
An intranet is a set of networks, using the Internet Protocol and IP-based tools such as web browsers and file transfer applications, that is under the control of a single administrative entity. That administrative entity closes the intranet to all but specific, authorized users. Most commonly, an intranet is the internal network of an organization. A large intranet will typically have at least one web server to provide users with organizational information.
An extranet is a network that is limited in scope to a single organization or entity and also has limited connections to the networks of one or more other usually, but not necessarily, trusted organizations or entities—a company's customers may be given access to some part of its intranet—while at the same time the customers may not be considered trusted from a security standpoint. Technically, an extranet may also be categorized as a CAN, MAN, WAN, or other type of network, although an extranet cannot consist of a single LAN; it must have at least one connection with an external network. Overlay network
中原工学院信息商务学院毕业设计（论文）译文专用纸 第 22页
An overlay network is a virtual computer network that is built on top of another network. Nodes in the overlay are connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network.
A sample overlay network: IP over SONET over Optical
中原工学院信息商务学院毕业设计（论文）译文专用纸 第 23页
References
1.Michael A. Banks (2008). On the way to the web: the secret history of the internet and its founders. Apress. p. 1. ISBN 9781430208693.
http://books.google.com/books?id=P9wbSjO9WMMC&pg=PA1.
2. Christos J. P. Moschovitis (1998). History of the Internet: a chronology, 1843 to the present. ABC-CLIO. p. 36. ISBN 9781576071182.
http://books.google.com/books?ei=3isZTfzQMIaasAPHrrioAg&ct=result&id=Hu5SAAAAMAAJ&dq=intitle:"history+of+the+internet"+sage+sabre&q=sage+sabre's#search_anchor.
3. Chris Sutton. \Sent Between Two Computers\http://web.archive.org/web/20080308120314/http://www.engineer.ucla.edu/stories/2004/Internet35.htm.
4. New global standard for fully networked home, ITU-T Press Release 5. IEEE P802.3ba 40Gb/s and 100Gb/s Ethernet Task Force 6. \
http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci546288,00.html. Retrieved 2011-01-29.
7. Mobile Broadband Wireless connections (MBWA)
8. D. Andersen, H. Balakrishnan, M. Kaashoek, and R. Morris. Resilient Overlay Networks. In Proc. ACM SOSP, Oct. 2001. 9. \
http://www.webopedia.com/TERM/s/switch.html. Retrieved 2008-04-08. 10. \http://networkbits.net/lan-components/local-area-network-lan-basic-components/. Retrieved 2008-04-08.