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Business Data Communications and Networking Chapter 10 - The Internet.pdf

4 Pages

Course Code
158 .235
Arno Leist

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The Internet The most used network in the world. Made up of thousands of networks of national and state government agencies, and non-profit organizations and for-profit companies. Internet Hierarchical Structure Tier 1: National Internet Service Providers (ISPs) - Provide services to their customers and sell access to tier 2 and 3 ISPs - Provide access to their peers (other national ISPs) Tier 2: Regional ISPs - Connect to tier 1 ISPs - Provide services to their customers and sell access to local ISPs - Provide access to their peers (other regional ISPs) Tier 3: Local ISPs - Connected to tier 1 or 2 ISPs - Sell access to individuals - Provide access to their peers (other local ISPs) Network Access Points (NAPs): Connect tier 1 ISPs together. (Sometimes large tier 2 and 3 ISPs too) Run by common carriers Metropolitan Area Exchanges (MAEs): Connect tier 2 ISPs together. Peering – ISPs at the same level usually do not charge each other for exchanging messages. However higher level ISPs charge lower level ISPs. E.g. Tier 1 charges Tier 2 and Tier 3 Tier 2 charges Tier 3 Tier 3 charges individuals Users connect to an ISP through one of the ISPs Point of Presence. Corporate users have a cost of ISP charges + circuit charges Backbone for national ISPs uses OC-48 and OC-192, becoming more common. Internet Access Technologies Types: - 56k dial-up lines (mostly rural nowdays) - Digital Subscriber Line (DSL) - Cable Modems Digital Subscriber Line (DSL) A family of point-to-point technologie
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