What is the Internet backbone?
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The Internet backbone refers to the main "trunk" connections of the Internet. It is made up of a large collection of interconnected commercial, government, academic and other high-capacity data routes and core routers that carry data across the countries, continents and oceans of the world.
Part of the extreme resilience of the Internet is due to a high level of redundancy in the Internet backbone and the fact that the Internet Protocol routing decisions are made and updated in real-time during use.