The Internet:

Basic Concepts and Terminology

What is the Internet

The Internet (capital ‘I’) is the global public network of independent and autonomous networks that are governed by the Internet Protocol Suite.

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A partial map of the Internet based on 2005 data produced by the Opte project. Each line is drawn between nodes or addresses on the Internet. The colors represent different top-level domains, such as com, edu and org. Click the map to zoom in.

Computer Networks

• A computer network is a group of two or more computers that are linked together.

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Computer Networks

• A computer network is a group of two or more computers that are linked together.
• Each type of network will have its protocols (rules) that determine how the computers communicate.

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Token Ring Protocol

Computer Networks

• A computer network is a group of two or more computers that are linked together.
• Each type of network will have its protocols (rules) that determine how the computers communicate.

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Token Ring Protocol

Ethernet Protocol

Computer Networks

• A computer network is a group of two or more computers that are linked together.
• Each type of network will have its protocols (rules) that determine how the computers communicate.

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Token Ring Protocol

Ethernet Protocol

Wifi Protocol

Local Area Network (LAN)

• A local area network (LAN) connects computers within a school or home.

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Local Area Network (LAN)

• A local area network (LAN) connects computers within a school or home.
• Example: An ethernet network uses wires ( ) to connect computers.

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Wifi: A Wireless LAN

• Example: AWifi network uses radio waves ( ) �to connect devices (computers, smart phones, printers).

Wide Area Network (WAN)

• Example: A wide area network (WAN) connects devices over a broad geographic region.
• An example might be a telephone network.

Communication Protocol

• A protocol is a system of rules that govern the behavior of some system.

Communication Protocol

• A protocol is a system of rules that govern the behavior of some system.

Diplomatic protocol or etiquette governs how diplomats should behave.

Communication Protocol

• A protocol is a system of rules that govern the behavior of some system.
• All devices connected on a network use the same communications protocol.

Digital protocol determines how digital devices should behave.

Communication Protocol

• A protocol is a system of rules that govern the behavior of some system.
• All devices connected on a network use the same communications protocol.

Diplomatic protocol or etiquette governs how diplomats should behave.

Digital protocol determines how digital devices should behave.

An Internetwork

An internetwork or internet (small ‘i’) is a collection of disparate networks that are connected together via gateways or routers (R).

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An Internetwork

An internetwork or internet (small ‘i’) is a collection of disparate networks that are connected together via gateways or routers (R).

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An Internetwork

An internetwork or internet (small ‘i’) is a collection of disparate networks that are connected together via gateways or routers (R).

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A router (R) is a device that transmits data between two different networks.

Internetwork Analogy

Think of an internet as the collection of different language communities around the globe, with the translators from one

language to another

being analogous

to internet

routers.

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Hello world

ciao mondo

你好世界

привет мир

Internet Protocol

• The Internet is an internetwork that is governed by a collection of protocols called the Internet Protocol Suite.

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Internet Protocol

• The Internet is an internetwork that is governed by a collection of protocols called the Internet Protocol Suite.

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• TCP/IP Protocol.

Internet Protocol

• The Internet is an internetwork that is governed by a collection of protocols called the Internet Protocol Suite.

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• TCP/IP Protocol.
• IP Addresses : 128.87.212.42

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Internet Protocol

• The Internet is an internetwork that is governed by a collection of protocols called the Internet Protocol Suite.

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• TCP/IP Protocol.
• IP Addresses : 128.87.212.42
• Connects devices all over the world.

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Routers

• Transmit data between different networks.

Routers

• Transmits data between different networks.

• A home router connects local devices to a cable modem.

Routers

• Transmits data between different networks.

• A home router connects local devices to a cable modem.
• A cable modem or DSL modem connects your home to your Internet Service Provider (ISP).

Routers

• Transmits data between different networks.

• A home router connects local devices to a cable modem.
• A cable modem or DSL modem connects your home to your Internet Service Provider (ISP).
• An enterprise-level router connects the ISP to the core Internet backbone routers.

Growth of the Internet

• The Internet has grown exponentially since its inception in 1984 (this graph shows since 1994).

Internet Connectivity

• Today, basically, the entire world is connected via the Internet protocols.

Source: Internet Society 2015 Annual Report