What part of 192.168.10.51 is the Network ID, assuming a default subnet mask?

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What part of 192.168.10.51 is the Network ID, assuming a default subnet mask? Answer: 192.168.10

Question context

This question is part of 💻 Computing within the broader 💾 Computer Science subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.