The Hierarchy of Networks ii how does an isp connect to the internet II fiber optic isp JIO

The Hierarchy of Networks.

Every computer that is connected to the Internet is part of a network, even the one in your home. For example, you may use a modem and dial a local number to connect to an Internet service provider (ISP). At work, you may be part of a Local Area Network (LAN), but you most likely still connect to the Internet using an ISP that your company has contracted with. when you connect to your ISP, you become part of their network. The ISP may then connect to a larger network and become part of their network. The Internet is simply a network of the network.

Most large communications companies have their own dedicated backbones connecting various regions. In each region, the company has a Point of Presence (POP). the POP is a place for local users to access the company's network, often through a local phone number or a dedicated line. The amazing thing here is that there is no overall controlling network. Instead, there are several high-level networks connecting to each other through Network Access Points or NAPs.

Network Example.
Here's an example. Imagine that company A is a large ISP. In each major city, company A has a POP The in each city is a rack full of modems that the ISP's customers dial into. company A leases fiber optic lines form the phone company to connect the POPs together.

Imagine that company B is a corporate ISP. company B builds large buildings in major cities and corporations locate their internet server machines in these buildings. company B is such a large
the company that it runs its own fiber-optic lines between its buildings so that they are all interconnected.

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