N-GEN
Communications Web-based Seminars ©NGCS
Seminar - An Overview of Communications Technologies
Seminar - An Overview of Communications Technologies
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Module 6 - Internet, Intranet, Extranet, e-Commerce and Web Services Slide 5 of 70 _________________ __________
The Internet
Network Hierarchy
_________________ __________ An Internet user need not to know the intricate details of the network. A user is simply connected to an Internet Service Provider (ISP) who is a part of the whole jigsaw puzzle. The ISPs are connected to National Access Points. NAPs are networked with each other by high speed communications lines. A User - A user can be a resident or a business. Users are connected to an ISP by a conventional phone, a Cable Modem Line or an Asynchronous Digital Subscriber Loop (ADSL) line or a T-1 line. Internet Service Provider (ISP) - An ISP is a company that provides end users access to the Internet. An ISP could be a very small local company or a large company with a large network. Large ISPs in Canada are Telus, Bell Canada and cable companies like Shaw. The U.S. has many large ISPs like UUNET and BBN. Point of Presence (POP) - Most large communications companies have their own dedicated backbone networks connecting various regions. The POP is a place where local users access the companies network. The POPs are connected to NAPs with high speed lines. National Access Points (NAPs) - NAPs connect various ISPs and POPs to inter-exchange the information. NAPs are connected to other large corporations NAPs. The Internet Network - NAPs are connected to each other with very high speed communications lines.
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User
