How did NAT help resolve the shortage of IPV4 addresses after the increase in SO

Question

How did NAT help resolve the shortage of IPV4 addresses after the increase in SOHO, Small Office Home Office, sites requiring connections to the Internet? Choose the best answer below:

a.It provides a migration path to IPV6.

B.It permits routing the private IPV4 subnet 10.0.0.0 over the Internet.

C.NAT adds one more bit to the IP address, thus providing more IP addresses to use on the Internet.

D.It allowed SOHO sites to appear as a single IP address, (and single device), to the Internet even though there may be many devices that use IP addresses on the LAN at the SOHO site.

Explanation / Answer

Option D:
It allowed SOHO sites to appear as a single IP address, (and single device), to the Internet even though there may be many devices that use IP addresses on the LAN at the SOHO site.

The main use of NAT is to limit the number of public IP addresses an organization or company must use, for both economy and security purposes. For this purpose, the devices inside SOHO are assigned private IP Addresses. (10.0.0.0 to 10.255.255.255, 172.16.0.0 to 172.31.255.255, or 192.168.0 0 to 192.168.255.255)

Routers inside the private network can route traffic between private addresses easily. However, to access resources outside the network, like the Internet,

Now if Some device of the SOHO need to access the internet,these computers need to get a public address in order for responses to their requests to return to them. In NAT, instead of using so many addresses, we use just one public address. End user device will make a request towards external address to which it want to access. Firewall will realise that the network requested is outside the private network, hence it will use its own IP public address and fetch the resource from internet.. then again it will handover that response to the device inside the private network..

It is just like if you can;t enter a building.. You asks guard to get something from inside the building.. Guard goes there and brings it for you and then it gives that thing back to you.. Nobody inside the building know you.. they just know the guard.

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