NAT translates computers’ IP addresses into a single IP address, that too in a local network. The full-form of NAT is ” Network Address Translation .” This address is often used by a router that connects computers with the Internet. The Router is connected with a DSL modem, cable modem , T1 line, or a dial-up modem.
When other computers attempt in the Internet to access computers in that local network, then they can only see the IP address of the router.
This adds an extra level of security, since the router is configured as a firewall, while only authorized systems are allowed to access computers in that network.
Once the system is allowed from outside the network to access a computer within a network, then the IP address is then translated from router’s address to computer’s unique address.
You can find this address in a “NAT table” which defines internal IP addresses in the network of computers.
This NAT table defines the global address that can be seen outside the network by computers.
As such, each computer has a specific IP address in a local network , so external systems can only see a single IP address when they are connected to any network with any computer.
Simply put, network address translation makes it possible for computers that are located outside the local area network (LAN) to see only the same IP address, whereas computers are unique to each system within a network. can see the address.
Although this helps a lot in network security, but it also limits the number of IP addresses required by companies and organizations.
At the same time, with the use of NAT, very large companies with thousands of computers can also use a single IP address to connect to the Internet. Now it shows that it is very efficient.