Default Web Ports

echo                      7
daytime              13
qotd                     17 (Quote of the Day)
ftp                         21
telnet                   23
smtp                     25
time                      37
nameserver       53
nicname              43 (Who Is)
gopher                 70
finger                    79
WWW                    80

 

DNS – Maintain mapping between domain names and IPs

http://www.google.com/hi.html -> Browser makes call to DNS servers to get related IP and then will send the request to that IP for hi.html file. Cookies (piece of text that gets stored in the machine as key-value pair) will be transferred between browser to server and vice version as part of headers.

Web Charts

D3 charts – https://github.com/mbostock/d3/wiki/Gallery

dojo charts – http://dojotoolkit.org/documentation/tutorials/1.8/charting/

jquery charts –

http://www.1stwebdesigner.com/css/top-jquery-chart-libraries-interactive-charts/

Best jQuery Chart Libraries for Building Interactive Charts

 

Modern charts are using SVG markup – http://www.w3schools.com/svg/default.asp