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Subnetting

In the second week of this course, we'll explore the network layer in more depth. We'll learn about the IP addressing scheme and how subnetting works. We'll explore how encapsulation works and how protocols such as ARP allow different layers of the network to communicate. We'll also cover the basics of routing, routing protocols, and how the Internet works. By the end of this module, you'll be able to describe the IP addressing scheme, understand how subnetting works, perform binary math to describe subnets, and understand how the Internet works.

The Bits and Bytes of Computer Networking

Курс 2 из 5 — Сертификация специалиста по ИТ-поддержке Google Специализация

This course is designed to provide a full overview of computer networking. We’ll cover everything from the fundamentals of modern networking technologies and protocols to an overview of the cloud to practical applications and network troubleshooting. We’ll wrap up by covering how this information might show up in a job interview and giving you a few tips for troubleshooting on the spot. 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. ● understand cloud computing, everything as a service, and cloud storage.

Просмотреть программу курса

Получаемые навыки

Domain Name System (DNS), Ipv4, Network Model, Troubleshooting

Преподаватели

Google

Текст видео

In the most basic of terms,

subnetting is the process of taking a large network and splitting

it up into many individual smaller subnetworks or subnets.

By the end of this lesson,

you'll be able to explain why subnetting is necessary and describe how

subnet masks extend what's possible with just network and host IDs.

You'll also be able to discuss how a technique known as

CIDR allows for even more flexibility than plain subnetting.

Lastly, you'll be able to apply

some basic binary math techniques to better understand how all of this works.

Incorrect subnetting setups are

a common problem you might run into as an IT support specialist,

so it's important to have a strong understanding of how this works.

That's a lot, so let's dive in.

As you might remember, from the last lesson,

address classes give us a way to break the total global IP space into discrete networks.

If you want to communicate with the IP address 9.100.100.100,

core routers on the Internet know that this IP belongs to the 9.0.0.0 class A network.

They then route the message to the gateway router

responsible for the network by looking at the network ID.

A gateway router specifically serves as the entry and exit path to a certain network.

You can contrast this with core Internet routers,

which might only speak to other core routers.

Once your packet gets to the gateway router for the 9.0.0.0 class A network,

that router is now responsible for getting

that data to the proper system by looking at the host ID.

This all makes sense until you remember that a single class A network

contains 16,777,216 individual IPs.

That's just way too many devices to connect to the same router.

This is where subnetting comes in.

With subnets, you can split your large network up into many smaller ones.

These individual subnets will all have

their own gateway routers serving as the ingress and egress point for each subnet.

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