A network administrator needs to configure NAT to allow approximately 200 internal hosts to access the internet simultaneously. However, the ISP has only provided a single public IP address for this purpose. Which NAT implementation must be configured to achieve this?
NAT Passthrough
Dynamic NAT
Static NAT
NAT Overload (PAT)
The correct implementation is NAT Overload, also known as Port Address Translation (PAT). PAT allows multiple internal (private) IP addresses to be translated into a single external (public) IP address by using unique source port numbers for each session. Static NAT creates a permanent one-to-one mapping. Dynamic NAT also creates a one-to-one mapping, but it is done on-demand from a pool of public addresses and requires a public IP for each internal host. Since there is only one public IP available for many hosts, PAT is the only suitable option.
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