6. What is Internet? Internet is a global network of smaller networks. Internet is the largest network. It is owned by NOBODY Smaller network: 1-1000 computers Satellites, Submarine Optical cables The biggest name is Cisco
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10. DNS? DNS is like post office Some post offices will be knowing some addresses DNS servers will have addresses like this www.google.com => 64.67.33.200 Multiple Name servers for reliability
11. Domain Name MUFIXCommunity.com mail.MUFIXCommunity.net http://www.mufixcommunity.net http://www.mufix community.net:80 http://mail.mufic.com:8086/inbox/index.jsp Port
12. A simple web request Browser Name Server Internet Web Server IIS, Apache, Lighttpd etc. BIND, PowerDNS, djbdns HTTP Response http://bookmarks.rediff.com/recent/ DNS Lookup bookmarks.rediff.com => 210.210.93.86
13. Multi Tier App? Database Server Application Server App Server - Biz Logic - Processing - Modifying Data J2EE, ASP.NET, PHP, RoR, Python Apache/TomCat, IIS, lightTPD MS SQL, MySQL, Oracle Web Server Internet Web Server - Static File Serving - Caching - Proxying Database Server - Storage of Data - Retrieval - Some Biz logic