350-401 Question #154: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. The inside and outside interfaces in the NAT configuration of this device have been correctly identified. What is the effect of this configuration?

Options

• Adynamic NAT
• BNAT64
• CPAT
• Dstatic NAT

Explanation

PAT (Port Address Translation) Explanation

Option C is correct because the configuration uses the ip nat inside source list command combined with the overload keyword, which is the defining characteristic of PAT (also called NAT overload). PAT allows multiple internal hosts to share a single public IP address by differentiating connections using unique port numbers, which is exactly what the overload keyword enables.

Why the distractors are wrong:

• A (Dynamic NAT): Dynamic NAT also uses an ACL and a pool, but critically does not include the overload keyword - each inside host gets its own unique public IP from the pool
• B (NAT64): NAT64 is used to translate between IPv6 and IPv4 addresses, which is unrelated to this standard IPv4 NAT configuration
• D (Static NAT): Static NAT uses the ip nat inside source static command with a one-to-one permanent mapping between a specific private and public IP address

💡 Memory Tip: Think of the word "overload" - PAT overloads a single IP address with many connections by adding port numbers. If you see overload in a NAT config, it's always PAT. No exceptions!

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