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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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Total translations: 1 (this indicates that the 1st packet triggered NAT to add an entry to the NAT table.) B. & D. are incorrect, no "overload" keyword was added to the nat translation (NAT overload a.k.a. PAT.) C. We can't confirm this unless we check the NAT translations using the "show ip nat translations" command and we find that the outside local and global IP addresses are using TCP with port number 23
It's a valid NAT configuration, so the first packet to match the ACL will create a translation using the pool. The other answers can be eliminated as two refer to PAT (requires overload in the nat statement) and one references a network that isn't part of the example.
B - Wrong as the configuration is not that of NAT overload. D - Wrong as the configuration is not that of port access translation (PAT). Note that PAT is the same as NAT Overload. C - The output provided doesn't show evidence of a TCP connection. A- Right as the last line of the output shows that one of the outside global addresses is in use.