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Exam 200-150 topic 1 question 70 discussion

Actual exam question from Cisco's 200-150
Question #: 70
Topic #: 1
[All 200-150 Questions]

What is the subnet mask for the network 172.16.0.0/21?

  • A. 255.255.0.0
  • B. 255.255.255.240
  • C. 255.255.248.0
  • D. 255.255.255.248
  • E. 255.255.248.240
  • F. 255.255.255.0
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Suggested Answer: C 🗳️
by snapper at Aug. 22, 2019, 11:44 p.m.

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snapper
5 years, 10 months ago
/21 mask = 11111111.11111111.11111000.00000000 Add up the decimal values for each "1" position in the third octet: 128+64+32+16+8 = 248 So, it's 255.255.248.0
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