IPv4 has lasted this long due to <strong data-start=”1909″ data-end=”1969″>innovations like NAT, CIDR, VLSM, and private addressing, which stretched its limited capacity.

However, it is <strong data-start=”2027″ data-end=”2046″>not sustainable because the <strong data-start=”2059″ data-end=”2089″>address space is exhausted, the number of…

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