From the course: Cisco CCNA (200-301) Cert Prep: 1 Network Fundamentals and Access

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Private IPv4 addressing and NAT

Private IPv4 addressing and NAT

From the course: Cisco CCNA (200-301) Cert Prep: 1 Network Fundamentals and Access

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Private IPv4 addressing and NAT

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- [Presenter] While IPV4 addressing is what currently connects most of networks and carries a large portion of the information across the internet, globally routable IPv4 address space has become scarce. We've already breached the exhaustion threshold and internet registries have run out of IPv4 addressing that can be allocated to various organizations. This isn't a new issue. In fact it was in the 1980's and early 90's that mitigations began being put into place. Two network level stop gaps were private addressing and network address translation. RFC1918 introduced three ranges of IP addressing considered to be private addressing. The concept of private means that these are not IP addresses that are reachable on the globally routed internet table. In fact, they are only reachable within a single organization. This means that now using private addressing networks of tens of hosts to thousands of hosts can now be addressed without exacerbating IPv4 exhaustion. Now that my…

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