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Difficulty: MediumNAT and PAT Implementation

Match each Network Address Translation (NAT) term on the left with its correct operational description or mapping behavior on the right.

  • Inside Local AddressThe private IPv4 address assigned to a host on the internal network.
  • Inside Global AddressThe publicly routable IPv4 address that represents an internal host to the external network.
  • Port Address Translation (PAT)A translation method that maps multiple private IP addresses to a single public IP address using unique L4 port numbers.
  • Static NATA fixed 1-to-1 mapping between a specific private IP address and an assigned public IP address.

Answer

Inside Local Address matches the private IPv4 address assigned to an internal host. Inside Global Address matches the public IPv4 address representing an internal host externally. Port Address Translation (PAT) matches mapping multiple private IP addresses to a single public IP address using unique port numbers. Static NAT matches a fixed 1-to-1 mapping between a private IP address and a public IP address.
Inside Local is the private address assigned to an internal host. Inside Global is the public address that represents an internal host externally. Port Address Translation (PAT) maps multiple private IP addresses to a single public address using Layer 4 port numbers. Static NAT establishes a fixed 1-to-1 translation between a private IP address and a public IP address.

Step-by-Step Solution

1
Identify the internal addressing terms used in Cisco and standard networking terminology.
'Inside Local' represents the actual address assigned to a device on the internal network (private IP), whereas 'Inside Global' represents how that same device appears to external networks (public IP).
Understanding the four NAT address types (Inside Local, Inside Global, Outside Local, Outside Global) is essential for proper routing and address translation configuration.
2
Analyze translation mechanisms for scaling and hosting.
Static NAT provides a static, permanent 1-to-1 mapping suited for inbound accessibility (servers), while PAT uses Layer 4 port identifiers to multiplex multiple private hosts onto one public IP address.
Differentiating between 1-to-1 static NAT and many-to-1 dynamic PAT (Overload) ensures efficient IPv4 pool usage based on enterprise requirements.

Key Concept

NAT Terminology and Address Translation Types
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Topics

NAT and PAT Implementation

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