350-401 Question #450: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. A network engineer configures NAT on R1 and enters the show command to verify the configuration. What does the output confirm?

Options

• AThe first pocket triggered NAT to add on entry to NAT table
• BR1 is configured with NAT overload parameters
• CA Telnet from 160.1.1 1 to 10.1.1.10 has been initiated.
• DR1 to configured with PAT overload parameters

Explanation

The miss: 1 entry in the NAT translation table output indicates that a packet did not find an existing translation and consequently triggered the creation of a new NAT entry.

Common mistakes.

• B. While the presence of port numbers might suggest PAT (a form of NAT overload), the miss: 1 value itself directly confirms the dynamic creation of a translation, not the specific configuration of NAT overload parameters.
• C. The translation shows Inside local: 192.168.1.1:1026 mapping to Inside global: 10.1.1.10:23, indicating an inside host (192.168.1.1) is initiating a connection (likely Telnet, port 23) to an outside host, not a Telnet from 160.1.1.1 to 10.1.1.10.
• D. Similar to B, this output primarily confirms the event of a new translation being added, rather than the explicit configuration of PAT overload parameters. Other commands are used to confirm PAT configuration.

Concept tested. NAT translation table interpretation (miss count)

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/xe-16/nat-xe-16-book/ipnat-cfg-nat.html

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