Installing NS2

There are two ways of using NS2:
On Linux Operating System or on Windows Operating System.

On Linux, after downloading NS2 follow these steps:
Copy ns-allinone-2.35.tar.gz file to your home directory.
Run terminal by pressing Ctrl+Alt+T .

Execute “tar -xzvf ns-allinone-2.35.tar.gz” command.
 Execute “cd ns-allinone-2.35” command. Execute “./install” command. Execute “cd ns2.35” command.

TRANSACTION IN DATABASES

Most of the organisations use database to store their information such as bank may use a database to store the balance of all depositors in a bank.
For Example:

DATA LINK CONTROL

 For  effective  digital  data communications,  much  more  is  needed  to  control  and manage  the  exchange.  In  this  chapter,  we  shift  our  emphasis  to  that  of  sending  data over  a  data  communications  link.  To  achieve  the  necessary  control,  a  layer  of  logic  is added  above  the  physical  transmission  layer;  this  logic  is  referred  to  as  data  link control  or  a  data  link  control  protocol.  When  a  data  link  control  protocol  is  used,