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Multiple Choice

Which NAT type uses a pool of addresses and can randomize the mapped external address?

Dynamic NAT uses a pool of public IP addresses and assigns one from that pool to internal hosts for each active session. Because there are many external addresses to choose from, the router can map different internal hosts to different external addresses, and mappings can change over time, giving the appearance of randomizing the external address. Static NAT keeps a fixed one-to-one mapping, and PAT/NAT overload uses a single external address with port numbers, so there’s no pool to randomize from.

Dynamic NAT uses a pool of public IP addresses and assigns one from that pool to internal hosts for each active session. Because there are many external addresses to choose from, the router can map different internal hosts to different external addresses, and mappings can change over time, giving the appearance of randomizing the external address. Static NAT keeps a fixed one-to-one mapping, and PAT/NAT overload uses a single external address with port numbers, so there’s no pool to randomize from.