Option C is the correct set of commands to complete the configuration of NAT on R1. The configuration steps are as follows12:
* Define the inside and outside interfaces for NAT using the ip nat inside and ip nat outside commands. In this case, the inside interface is GigabitEthernet0/0 and the outside interface is GigabitEthernet0/1: interface GigabitEthernet0/0 and ip nat inside, interface GigabitEthernet0/1 and ip nat outside.
* Configure a static NAT entry that maps the inside local address 192.168.10.17 to the inside global address 192.168.27.42 using the ip nat inside source static command: ip nat inside source static
192.168.10.17 192.168.27.42.
* Verify the NAT configuration using the show ip nat translations and show ip nat statistics commands: show ip nat translations and show ip nat statistics.
Option A is incorrect because it does not define the inside and outside interfaces for NAT, which is required for NAT to function properly1.
Option B is incorrect because it uses the ip nat outside source static command, which is used to translate the source address of packets that travel from outside to inside, and the destination address of packets that travel from inside to outside. This is not the desired behavior for this scenario, where the inside local address
192.168.10.17 should be translated to the inside global address 192.168.27.42 in both directions1.
Option D is incorrect because it uses the ip nat pool and ip nat inside source list commands, which are used to configure dynamic NAT or PAT, not static NAT. These commands create a pool of inside global addresses and an access list to define which inside local addresses are eligible for translation. However, in this scenario, there is only one inside local address and one inside global address, so a static NAT entry is sufficient1. References: 1: Configure Network Address Translation, 2: Static NAT