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Difficulty: MediumInside Source NAT and PAT Configuration and Verification

A network administrator needs to configure static Network Address Translation (NAT) on a Cisco IOS router to map an internal server at private IPv4 address 10.20.30.510.20.30.5 to an external public IPv4 address 203.0.113.25203.0.113.25. Which global configuration command creates this static one-to-one inside source mapping?

Answer: ip nat inside source static 10.20.30.5 203.0.113.25

Answer

ip nat inside source static 10.20.30.5 203.0.113.25
The command 'ip nat inside source static 10.20.30.5 203.0.113.25' correctly defines a one-to-one static mapping between an internal private IPv4 host address (inside local) and an external public IPv4 address (inside global).

Step-by-Step Solution

1
Identify the static NAT configuration command syntax in Cisco IOS.
The standard syntax is 'ip nat inside source static <local-ip> <global-ip>'.
Static NAT requires defining the parameter 'static' along with the inside local IP address followed by the inside global IP address.
2
Substitute the specified IP addresses into the syntax template.
Inside local IP is 10.20.30.5 and inside global IP is 203.0.113.25, giving 'ip nat inside source static 10.20.30.5 203.0.113.25'.
This establishes a permanent static translation entry between the internal host address and the public IPv4 address.

Key Concept

Static Inside Source NAT Configuration
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Topics

Inside Source NAT and PAT Configuration and Verification

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