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

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.

Any computers with private addresses in a SOHO network share a single connection to the Internet. With a VPN connection, the site-to-site connection from the small office to the main office is “tunneled” through the Internet.

Any computer with a direct (routed) connection to the Internet requires a public IP address from the Internet Assigned Numbers Authority (IANA). IANA allocates public addresses and guarantees them to be globally unique on the Internet. The limited and ever-decreasing availability of public IPv4 addresses is one of the most compelling problems facing the IP Internet. The major long-term solution to the problem of address depletion is the development of IPv6, which introduces a new addressing model that uses 16-byte addresses expressed in colon-hexadecimal notation rather than the familiar four-byte IPv4 addresses typically expressed in dotted-decimal notation. Until the long-term IPv6 solution is widely in use, however, other methods to ensure that IPv4 addresses remain available are urgently required. One temporary solution that reduces the demand for IPv4 addresses is address reuse.

NAT, originally defined in RFC 1631 and extended in RFC 3022, was developed explicitly to provide a method that enabled an unlimited number of organizations to reuse private IPv4 addresses on their networks, thus substantially decreasing the demand for new public IPv4 addresses. This need to decrease the demand for public IPv4 addresses was the initial impetus for the creation of NAT technology.

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