Routers

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En provenance du cours de Google

The Bits and Bytes of Computer Networking

1738 notes

Google

The Bits and Bytes of Computer Networking

1738 notes

Cours 2 sur 6 dans Specialization Google IT Support Professional Certificate

This course is designed to provide a full overview of computer networking. In this course, we’ll cover everything from the fundamentals of modern networking technologies and protocols to practical applications and network troubleshooting. By the end of this course, you’ll be able to: - describe computer networks in terms of a five-layer model. - understand all of the standard protocols involved with TCP/IP communications. - grasp powerful network troubleshooting tools and techniques. - learn network services like DNS and DHCP that help make computer networks run. Except as otherwise noted, the contents on this site are licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

À partir de la leçon

Introduction to Networking

Welcome to the Networking course of the IT Support Professional Certificate! In the first week of this course, we will cover the basics of computer networking. We will learn about the TCP/IP and OSI networking models and how the network layers work together. We'll also cover the basics of networking devices such as cables, hubs and switches, routers, servers and clients. We'll also explore the physical layer and data link layer of our networking model in more detail. By the end of this module, you will know how all the different layers of the network model fit together to create a network.

Hubs and Switches2:28

Servers and Clients2:00

Sergio Being A Network Engineer1:26

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Hubs and switches are the primary devices used to connect computers on a single

network, usually referred to as a LAN, or local area network.

But we often want to send or receive data to computers on other networks.

This is where routers come into play.

A router is a device that knows how to forward data between independent networks.

While a hub is a layer one device and a switch is a layer two device.

A router operates at layer three, a network layer.

Just like a switch can inspect Ethernet data to determine where to send things,

a router can inspect IP data to determine where to send things.

Routers store internal tables containing information about how to route traffic

between lots of different networks all over the world.

The most common type of router you'll see is one for a home network, or

a small office.

These devices generally don't have very detailed routing tables.

The purpose of these routers is mainly just to take traffic originating from

inside the home, or office LAN, and

to forward it along to the ISP, or Internet Service Provider.

Once traffic is at the ISP, a way more sophisticated type of router takes over.

These core routers form the backbone of the Internet and are directly responsible

for how we send and receive data all over the Internet every single day.

Core ISP routers don't just handle a lot more traffic than a home or

a small office router.

They also have to deal with much more complexity in making decision about

where to send traffic.

A core router usually has many different connections to many other routers.

Routers share data with each other via a protocol known as BGP, or

Border Gateway Protocol.

That lets them learn about the most optimal paths to forward traffic.

When you open a web browser and load a webpage, the traffic between computers and

the web servers could have traveled over dozens of different routers.

The Internet is incredibly large and complicated.

And routers are global guides for getting traffic to the right places.

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