Wide Area Network Technologies

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Del curso dictado por Google

The Bits and Bytes of Computer Networking

3965 calificaciones

Google

The Bits and Bytes of Computer Networking

3965 calificaciones

Curso 2 de 5 en SpecializationGoogle 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.

De la lección

Connecting to the Internet

In the fifth week of this course, we'll explore the history of the Internet, how it evolved, and how it works today. We'll understand the different ways to connect to the Internet through cables, wireless and cellar connections, and even fiber connections. By the end of this module, you'll be able to define the components of WANs and outline the basics of wireless and cellular networking.

Wide Area Network Technologies3:06

Point-to-Point VPNs2:00

Conoce a los instructores

Google

Let's say that you're in charge of the network as

the sole IT support specialist at a small company.

At first, the business only has a few employees with a few computers in a single office.

You decide to use non-routable address space for

the internal IPs because IP addresses are scarce and expensive.

You set up a router and configure it to perform NAT.

You configure a local DNS server and a DHCP server to make network configuration easier.

And of course, for all of this to really work,

you sign a contract with an ISP to deliver a link to

the Internet to this office so your users can access the web.

Now imagine the company grows.

You're using non-routable address space for your internal IPs,

so you have plenty of space to grow there.

Maybe some salespeople need to connect to resources

on the LAN you've set up while they're on the road,

so you configure a VPN server and make

sure the VPN server is accessible via port forwarding.

Now, you can have employees from all over the world connect to the office LAN.

Business is good and the company keeps growing.

The CEO decides that it's time to open a new office in another city across the country.

Suddenly, instead of a handful of sales people

requiring remote access to the resources on your network,

you have an entire second office that needs it.

This is where wide area networks or WAN technologies come into play.

Unlike a LAN or a local area network,

WAN stands for wide area network.

A wide area network acts like a single network but

spans across multiple physical locations.

WAN technologies usually require that you

contract a link across the Internet with your ISP.

This ISP handles sending your data from one side to the other.

So, it could be like all of your computers are in the same physical location.

A typical WAN set up has a few sections.

Imagine one network of computers on one side of

the country and another network of computers on the other.

Each of those networks ends at a demarcation point,

which is where the ISPs network takes over.

The area between each demarcation point and

the ISP's actual core network is called a local loop.

This local loop would be something like a T-carrier line or

a high-speed optical connection to the provider's local regional office.

From there, it would connect out to the ISP's core network and the Internet a large.

WANs work by using a number of different protocols at

the data link layer to transport your data from one site to another.

In fact, these same protocols are what are sometimes at work

at the core of the Internet itself instead of our more familiar Ethernet.

Covering all the details of these protocols is out of the scope of this course,

but in an upcoming lesson,

we'll give you some links to the most popular WAN protocols.

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