200-301: Cisco Certified Network Associate

Private addressing is intended for internal network use with addresses that are not advertised on the public Internet, which keeps local IP space out of the global routing table. It also lets an organization structure and subnet its internal address space in a logical hierarchy without requiring public address allocations for every internal segment. RFC 1918 defines private address space specifically for hosts that do not need external IP-layer connectivity and notes that such categories can use unambiguous private space instead of globally unique addresses.