Which statement is true about RFC 1918 private address blocks?

Which statement is true about RFC 1918 private address blocks?

• A. They are reserved for use within an organization's network and are not routable on the public Internet by default
• B. They are allocated by IANA for global Internet addressing
• C. They require three addresses only
• D. They are a subset of public addresses

Answer: (A)

RFC 1918 private address blocks are meant for internal use within an organization and are not routable on the public Internet by default. This means Internet routers won’t forward traffic to or from these addresses unless you translate them to public addresses with NAT or use them behind a VPN. Using private ranges helps conserve public IPv4 space and lets different networks reuse the same addresses without conflict. The well-known private blocks are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16, which can cover very large or smaller subnets as needed. Because they’re private, the same addresses can appear in many different networks without interaction. They aren’t allocated by IANA for global Internet addressing; they are designated for internal use and are not meant for global routing. They aren’t limited to three addresses; private ranges can contain millions of addresses depending on the subnet mask. And they aren’t a subset of public addresses—they’re separate blocks reserved for private use.

RFC 1918 private address blocks are meant for internal use within an organization and are not routable on the public Internet by default. This means Internet routers won’t forward traffic to or from these addresses unless you translate them to public addresses with NAT or use them behind a VPN. Using private ranges helps conserve public IPv4 space and lets different networks reuse the same addresses without conflict. The well-known private blocks are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16, which can cover very large or smaller subnets as needed. Because they’re private, the same addresses can appear in many different networks without interaction. They aren’t allocated by IANA for global Internet addressing; they are designated for internal use and are not meant for global routing. They aren’t limited to three addresses; private ranges can contain millions of addresses depending on the subnet mask. And they aren’t a subset of public addresses—they’re separate blocks reserved for private use.