M5 internet systems & applications ii

Introduction
Master Class 5
Internet infrastructures & Technologies :
Internet Systems & applications II
Josep Bardallo 2012

230 / 10 / 2012Josep Bardallo
Services used in Internet (application layer)

Web Server. Definition
 Webserver: A computer that deliver content in Internet.
 The primary function of a web server is to deliver web pages on the
request to clients using the Hypertext Transfer Protocol (HTTP).

Web Servers. Elements
 The Web server includes the hardware, operating system, Web
server software, TCP/IP protocols and site content (Web pages,
images and other files).
 A user agent (web browser), initiates communication by making a
request for a specific resource using HTTP and the server responds
with the content of that resource or an error message if unable to do
so.
 Web servers are not only on Internet. HTTP server software is
commonly built into hardware to provide a control panel for
configuring the device from any Web browser, or for Intranets.

Web Servers in the world by domain (Oct. 2012)

Web Servers Architecture: 3 Tier Layer

Typical architectures: Standard services in a company

Typical architectures: Complex Web environment.
Sample 1 (Real Case)

Sample 2 (Real Case). Car selling

Sample 3 (Real Case). City Council

Web Servers. Top 500 sites
http://www.alexa.com/topsites

Number of servers of Top 100 (estimated and
growing)
 Google: estimated more than 900.000 servers
 Amazon: 500.000+ (322.000+ Virginia, 1.600 in Sao Paulo in 25
racks)
 Microsoft 300.000+ servers
 Facebook: 180.000+
 QVH: 120.000+ servers
 Softlayer, Rackspace, Akamai, Yahoo: 100.000+ servers
 Intel, 1&1, Ebay, GoDaddy: 70.000+ servers
 Verizon, Time Warner: 30.000+ servers

Web Servers Technology

User Agent: Operating Systems in Internet

User Agent: Web Browsers in Internet

User Agent: Web Browsers in Internet. Trends

User Agent: Web Browsers in Internet. By Country

Secure Servers (SSL)
 Secure Sockets layer (SSL) is a form of protocol, used by e-
commerce sites, on-line banking and financial services to secure
communications by encrypting the data transmitted between two
points over Internet
 When the user enters a site with SSL certificate, they public key of
the site certificate is received by the browser and used to encrypt
the submitted information. The data can only be decrypted with the
key issued to the certificated site, assuring it will be readable only
by the internet intended recipient.

Email
 Electronic mail, or e-mail, is a method of exchanging digital
messages from an author to one or more recipients

Email: Elements
 Email Client, SMTP Server (MTA), POP Server

Email: Workflow

MTA Vendors

Email: Some numbers

Email: SPAM

Internet Video & Images

Storage in Internet

Bibliography
 http://w3techs.com/technologies/cross/web_server/ranking
 http://gigaom.com/cleantech/facebooks-number-of-servers-soar-to-an-estimated-180k/
 http://news.netcraft.com/archives/2012/07/03/july-2012-web-server-survey.html
 http://www.radicati.com/wp/wp-content/uploads/2011/05/Email-Statistics-Report-2011-2015-Executive-
Summary.pdf
 http://www.clickz.com/type/news/category/stats
 http://www.symantec.com/theme.jsp?themeid=state_of_spam
 http://www.mailradar.com/
 http://www.w3counter.com/globalstats.php?year=2012&month=9
 http://marketshare.hitslink.com/
 http://www.wired.com/wiredenterprise/2012/03/amazon-ec2/

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