ICT 202 Lecture Notes - Lecture 46: Internet Service Provider, Tier 1 Network, Peering
24 Mar 2019
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Document Summary
An internet service provider (isp) is a company that provides internet access. The most common isp is the provider who delivers internet to your home or business for a fee. A tier 1 isp is an internet provider who exchanges internet traffic with other tier 1 providers. Three isps exchange traffic strictly through peering agreements. Tier 1 internet providers are the networks that provide the backbone of the internet. These providers build infrastructure such as the atlantic internet sea cables. They provide traffic to all other internet providers, not end users. Without tier 1, internet providers, internet traffic could not be exchanged between continents and countries. A tier 2 isp is a service provider who connects between tier 1 and tier 3 internet service providers. Tier 2 providers will exchange internet traffic through peering agreements, as well as purchase internet transit. Tier2 and tier 3 internet providers are sometimes used interchangeably.
