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Difficulty: EasyInside Source NAT and PAT Configuration and Verification

A network administrator is configuring Port Address Translation (PAT) on a Cisco IOS router to allow internal users access to the Internet using a single public IP address assigned to the GigabitEthernet0/1 interface. The administrator has already configured the Access Control List (ACL) and the inside/outside interfaces. What exact Cisco IOS keyword must be appended to the end of the 'ip nat inside source list 1 interface GigabitEthernet0/1' command to enable port-level address translation?

Answer: overload / the overload keyword / overload keyword

Answer

overload
The 'overload' keyword instructs the Cisco IOS router to perform Port Address Translation (PAT), enabling multiple private IPv4 addresses to share a single public IP address by tracking source port numbers.

Step-by-Step Solution

1
Identify the requirement for Port Address Translation (PAT) using an interface IP address.
PAT enables multiple private IP addresses to share a single public IP address by mapping distinct layer 4 port numbers.
Without the overload capability, static NAT or standard dynamic NAT requires a 1-to-1 IP mapping.
2
Determine the necessary Cisco IOS command syntax.
The command syntax is 'ip nat inside source list <acl> interface <interface> overload'.
The 'overload' keyword specifically enables PAT, allowing port tracking for dynamic address translation.

Key Concept

Port Address Translation (PAT) Interface Overload Syntax
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Topics

Inside Source NAT and PAT Configuration and Verification

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