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Table Of Contents  CertiGuide to Security+
 9  Chapter 3:  Infrastructure Security (Domain 3.0; 20%)
      9  3.3  Security Topologies
           9  3.3.1  Security Zones

Previous Topic/Section  Intranet
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3.3.2  VLANs (Virtual LANs)
Next Topic/Section  Extranet

An extranet is another type of logical network, which allows a business to connect with suppliers, vendors, customers, stockholders or others related to its business. An extranet is usually run over the Internet, often using a VPN for security. Alternatively, some companies limit their extranet functionality to data exchange via SSL-protected web pages that can only be accessed by authorized parties, and do not implement a VPN. The extranet’s primary components are normally situated within the company’s internal network, allowing limited access to some corporate resources to those outside the organization on a need-to-know basis, and allowing corporate staff to access limited resources on other organizations’ networks as needed.

If you are employing a VPN for your intranet, you may wish to employ a second VPN for your extranet, to best separate this “restricted public access” traffic from your completely internal traffic.


An extranet is an extension of some parts of a company’s network to its business partners, such as suppliers, vendors, customers and stockholders, on a need-to-know basis. Access to the extranet is normally provided over the Internet, using a VPN or SSL-based web pages.

Previous Topic/Section  Intranet
Previous Page
Pages in Current Topic/Section
Next Page
3.3.2  VLANs (Virtual LANs)
Next Topic/Section

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CertiGuide for Security+ ( on
Version 1.0 - Version Date: November 15, 2004

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