172.28.0.0/16 is the only private IPv4 network in the list. RFC 1918 reserves three private address blocks for internal use: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. The 172.16.0.0/12 block covers 172.16.0.0 through 172.31.255.255, so 172.28.0.0/16 falls cleanly inside the private range. Private addresses are not globally routed on the public Internet and are commonly used for internal LANs, labs, branch networks, and enterprise addressing plans. The other listed choices are either invalidly written or outside the RFC 1918 private ranges. In real networks, private addressing is normally paired with NAT or routed only inside the organization. CCNA 200-301 v1.1 Network Fundamentals requires candidates to identify private IPv4 ranges and understand why they allow internal communication without Internet-routable addressing. Reference: Cisco CCNA IPv4 addressing fundamentals and RFC 1918 private address allocation.
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