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IPv4 Compatible IPv6 is a easy quant interview question on networking.
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This is an easy networking question that checks whether you understand IPv6 address notation and how IPv4 addresses embed within the IPv6 address space. It is the kind of foundational knowledge firms expect from candidates working on network infrastructure, low-latency systems, or protocol-level optimization.
To answer questions like this, you need to parse IPv6 hexadecimal notation, recognize the special format used for IPv4-compatible addresses, and convert between hex and dotted-decimal notation. The question rewards familiarity with the IPv6 specification rather than deep algorithmic reasoning.