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Difficulty: MediumNAT and PAT Implementation

Match each Network Address Translation (NAT) term on the left with its corresponding definition or role on the right.

  • Inside Local AddressThe private IPv4 address configured on an internal endpoint, which is not routable on the public Internet.
  • Inside Global AddressThe globally unique public IPv4 address assigned by an ISP that represents an internal host to external networks.
  • Outside Global AddressThe actual public IPv4 address assigned to a destination host on an external network.
  • Port Address Translation (PAT)A translation method that permits multiple internal private hosts to share a single public IPv4 address using unique source port numbers.

Answer

Inside Local Address corresponds to the private IPv4 address on the local endpoint. Inside Global Address corresponds to the public IPv4 address representing an internal endpoint to external networks. Outside Global Address corresponds to the external target's public IPv4 address. Port Address Translation (PAT) corresponds to mapping multiple private hosts to a single public IP address using distinct port numbers.
Each NAT concept strictly aligns with standard networking terminology: Inside Local is the internal host's private IP, Inside Global is the internal host's public translated IP, Outside Global is the external host's public IP, and Port Address Translation (PAT) multiplexes multiple private IP addresses over a single public IP using Layer 4 port numbers.

Step-by-Step Solution

1
Identify the boundary and visibility of internal addresses
Inside Local is private to the internal network, whereas Inside Global is public and visible to the Internet.
CompTIA Network+ standard definitions differentiate between local (private side) and global (public side) address perspectives.
2
Identify the external destination address terminology
Outside Global represents the public address of the remote host on the internetwork.
Outside addresses refer to devices located outside the local administrative domain, with global indicating its appearance on the public Internet.
3
Identify the translation mechanism utilizing Layer 4 identifiers
Port Address Translation (PAT) leverages TCP/UDP port numbers to multiplex connections.
PAT dynamically maps thousands of internal private IP addresses to a single public IP address by tracking unique port mappings.

Key Concept

NAT Terminology and PAT Overload Operation
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Topics

NAT and PAT Implementation

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