Internet

How the Internet Is Structured

The term Internet is a contraction of ‘interconnected networks’; indeed, the Internet is a gigantic global collection of linked networks. The networks that make up the Internet can range from tiny (just two or three connected computers) to massive (thousands of interlinked machines).

Page Design Pro

An Internet service provider (ISP) is a telecommunications business that delivers Internet-related services such as access to the Internet, domain name registration, website hosting, etc. ISPs enable you to connect to the Internet.

When you use your computer to access the Internet from home, you most likely connect to an ISP via a modem and a local telephone number or through a dedicated high-speed line. When you connect to your ISP, you become part of their network, which allows you to access the Internet.

The computers in your office are likely to be connected together into a network known as a local area network (LAN). This enables the computers in the office to communicate with each other. The LAN is most likely connected to an ISP, and this connection enables you to access the Internet from your office computer.

Either way, your home PC or office LAN becomes part of the ISP’s network. The ISP will link to a larger network, which will be connected to other larger networks to create a communications system that spans the entire globe.

Thus, the Internet is nothing more than a network of networks. These networks connect computers using various technologies, including conventional and high-speed telephone lines, fiber-optic cables, microwave links, wireless technologies, and satellite communications.

Routers

The networks are connected using routers. A router is a specialized computer that directs traffic on the Internet. As the Internet consists of hundreds of thousands of smaller networks linked together, routers are absolutely necessary.

When you want to visit a particular website, you type its address into your web browser. The address goes to the nearest router, which decides where that site is on the Internet.

The router also determines the most efficient path through all the networks to reach this destination. This determination is based on the traffic in different parts of the Internet and the available connections.

Higher-level networks

A particular region’s networks may be grouped into a mid-level network. Or they may be linked to a wide-area network (WAN). A WAN covers a larger geographical area than a mid-level network. If the website you are looking for is within the same regional network or WAN, the router will send it directly to its destination.

However, if the website you are looking for is on another part of the Internet, the router will send your request to a network access point (NAP). NAPs connect high-level networks and allow access to Internet backbones.

The Internet backbones are a collection of networks that link extremely powerful supercomputers. They are made up of fiber optic trunk lines (aka OC for an optical carrier). The fastest OCs can transit 2.488 gigabits per second!

There are many high-capacity backbones worldwide, all interconnected at various NAPs. They enable everyone, no matter where they are, to communicate freely with everyone else.

Repeaters

As you can see, the Internet is a veritable jumble of interconnected networks. These networks are linked using a variety of communication technologies, ranging from very slow to ultra-fast. Given the way routers decide the most efficient route, your data may circumnavigate the world before reaching its destination.

For example, a Dublin surfer’s request to view a website hosted in London seldom travels directly from Dublin to London; it is likely to be sent via the Americas should this be the fastest route (as measured in milliseconds).

The problem is that the further data has to travel, the more it deteriorates or fades. Repeaters are pieces of hardware that amplify or refresh the stream of data. Boosting the data signals enables the data to circumnavigate the globe yet arrive intact at its final destination.

Linking networks

Various types of equipment are used to connect the various lower-order networks that make up the vastness of the Internet. These include bridges, gateways, and hubs.

Bridges connect LANs. They enable data from one local area network to pass through another LAN en route to yet another LAN.

Gateways are similar to bridges. However, they also translate data from one type of LAN to another. For example, they can make data from a UNIX system intelligible on an Intel-based system.

Hubs link groups of networks so that computers in one network can talk to computers in all the other networks.

Servers and clients

All the computers on the Internet are either servers or clients. Servers are machines that provide services to other machines (hence the name).

There are various kinds of servers, each with specific functions. For example, web servers host websites, while email servers send and receive emails. FTP servers (file transfer protocol servers) upload and download files. One server machine may contain software for several service functions.

Clients are computers that connect to servers. For instance, you can connect to any website from your home or office computer, which is known as a client.

When your client machine connects to a server, it communicates with specific server software running on the server if you send an email; for example, it talks to the email software on the server.

Conclusion

To recap, the Internet is a single gigantic network of networks linked using a wide variety of technologies. The millions of individual networks, small and large, that make up the Internet are owned and operated by numerous individuals, small businesses, and large corporations. This means that the Internet is built on cooperation and that nobody actually owns it.

This lack of ownership might suggest that the Internet is subject to disruptions. Not so. When an individual network has problems, it merely drops out of the overall network, and only the computers on that network are affected. The computers communicating through the broken network, using bridges or gateways, will have plenty of alternate channels for doing their business.

Related posts

Boosting Internet Access Resilience, ISP Multihoming Explained

Paul C. Lafferty

Matt Hancock has no right to complain approximately the internet being

Paul C. Lafferty

Congress should skip net regulations that hit Facebook

Paul C. Lafferty