200-301: Cisco Certified Network AssociateDemo

Private IPv4 addressing allows the same internal address ranges to be used repeatedly in different organizations or sites because those addresses are not globally unique on the public Internet. It also preserves scarce public IPv4 space by letting internal devices use non-public addresses instead of consuming globally unique ones. RFC 1918 defines these private address blocks and explains that they are intended for hosts that do not require globally unique IP connectivity.