Moderate

How many class A, B and C network IDs can exist ?

Correct answer: D. 2113658

  • A. 128
  • B. 126
  • C. 16382
  • D. 2113658

Explanation

Using the traditional classful-addressing convention, the usable network-ID counts are 126 for Class A, 16,382 for Class B, and 2,097,150 for Class C. Their sum is 2,113,658, with the reserved all-zero and all-one network IDs excluded.

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