hi friends now we are seeing about IP Address as we have name to identify a person distinctly , as we receive a call to us when another person dial our no in the same way system finds an IP Address to send / receive data form one system to anther system ip address means it is a 32 decimal code seperated by period(.) ex :196.168.0.141 this is the ip seperated by (.) and this is is related with subnet mask which seperates ip from classes here classes means A,B,C,D,E these are classes which separates ip from there classes for ex: A - 1-126 B - 128-191 C - 192-223 D - 224-248 E - 249-255 all these IP are assigned by IANA standards only ( if u have doubt pls refer pervious post so that u can get the website addresses of IANA etc) A,B,C are used for general purpose D,E are used for future purpose Experimental purpose Here 127 is used for loop backadapter means self checking purpose here ping is the general command which is used to check whether the link is active o...