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Ipv4 address exhaustion

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

IPv4 address exhaustion is the depletion of available unique IPv4 addresses for assignment to networks and hosts.

IPv4 address exhaustion is the depletion of unique IPv4 addresses available for assignment. IPv6 is the long-term solution, while subnetting, CIDR, private addressing, and NAT extend IPv4’s usable lifetime. section 9.4

Use these mechanisms to understand how IPv4 capacity is extended:

  • Assign private addresses internally; RFC 1918 defines 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. section 9.4
  • Use NAT to translate private addresses into public addresses for Internet communication, because private addresses are not Internet-routable. section 9.4
  • Recognize public addresses as globally unique addresses outside RFC 1918 or other reserved ranges. section 9.4

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes
Defines address categories and NAT’s role, without developing exhaustion calculations or IPv6 implementation details.
Examples
Uses RFC 1918 ranges and private-to-public NAT translation as concrete illustrations.
What you can do after
Evaluate how private addressing and NAT extend IPv4 while recognizing IPv6 as the long-term solution.
How it connects
Connects IPv4 exhaustion with IPv6, subnetting, CIDR, private IPv4 addresses, RFC 1918, and Network Address Translation.
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