CCNA Study

NAT (Network Address Translation )

 NAT is used to translate private IP addresses into public IP addresses. There are three most common types of  NAT

1) STATIC : Normally  STATIC NAT is used to translate one Private IP address in to Public IP address. Static NAT map your single Public IP address to your single Private IP
  So by configuring static NAT someone can host servers like web,DNS, FTP etc., which can be accessed from out side (Internet)
2)  DYNAMIC  : This style of  NAT is normally used in large network where so many Private IP   addresses need to be translate in to PUBLIC IP. Dynamic NAT uses a pool or range  of Public IP.
3) PAT (Port Address Translation )or NAT Overload : It is the most famous style of NAT, used
    to translate Many Private IP addresses by using ONE Public IP address. PAT uses port No. Also used
   with Dynamic NAT.