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Exam 200-150 topic 1 question 107 discussion

Actual exam question from Cisco's 200-150
Question #: 107
Topic #: 1
[All 200-150 Questions]

How many IP addresses are usable for a subnet that has the address 10.6.128.0/21?

  • A. 1024
  • B. 2048
  • C. 1022
  • D. 2046
  • E. 256
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Suggested Answer: D 🗳️
by snapper at Aug. 19, 2019, 4:12 p.m.

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snapper
5 years, 10 months ago
Remember the formula 2^n - 2 So, a /21 leaves 11 host bits (32-21). 2 to the 11th power is 2048. Then subtract one for the network address and one for the broadcast address.
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