Network - Internet, Intranets & Extranets

Internet

• Worldwide publically accessible infrastructure of cables, routers, switches, and servers.
• Used to carry a wide variety of Services.

Services Carried on the Internet

• Worldwide Web.
• Email.
• File Transfer Protocol.
• VoIP.
• Streaming Video.
• Online Gaming.
• Many other services.

Intranets

• Privately accessible infrastructure of cables, routers, switches, and servers.
• Generally limited to a single company, organization, or group of companies.
• Used to carry a wide variety of services like the Internet.

Extranets

• Privately held WAN infrastructure.
• Generally owned by one company or organizations.
• May allow others access for a fee for specific purposes.
• Can be an Intranet with selective Business-Related access.
• Used to carry a wide variety of services like Internet
• Examples : Microsoft Azure and Amazon Web Services.