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Multi-Tier Model for Infrastructure Computing

Multi-Tier Model for Infrastructure Computing

Multi-Tier Model

Multi-Tier Model for Infrastructure Computing
Tier 1: Router, firewall, cache server(s), load balancing server(s), web server(s)
Tier 2: Application servers
Tier 3: Database servers

Tier 1: Router, firewall, cache server(s), load balancing server(s), web server(s)

  • The router and/or security device is the first access point the browser hits. The firewall may be part of the router or an independent device.
  • The next traffic point is a caching device. The caching device has the ability to manage thousands of connections and serve web content requests on behalf of the web servers. Through this function alone, the caching device can take a substantial amount of the traffic off of the site's network at that point.
  • The next point is a traffic management device (load balancing server). This device has ability to make intelligent decisions about which web server and/or application server is most suited to handle the next request. These decisions can be based on simple criteria such as which server is the most available or the decision can be based on more complex criteria such as which e-commerce application server is holding the contents of a shopping cart?
  • At the heart of the infrastructure are the web servers that house the majority of a site's content. For example, all of the static web pages, spec sheets, press releases, company info, etc. for www.dell.com are on standard, simple web servers running Microsoft®  IIS.

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