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Exam 200-355 topic 1 question 76 discussion

Actual exam question from Cisco's 200-355
Question #: 76
Topic #: 1
[All 200-355 Questions]

When using OFDM, how many subcarriers are devoted to carrying data?

  • A. 4
  • B. 12
  • C. 44
  • D. 48
  • E. 52
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Suggested Answer: D 🗳️
by xtrattitude4u at Aug. 11, 2019, 5:36 p.m.

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GoldenChild
5 years, 9 months ago
C is correct.
upvoted 1 times
GoldenChild
5 years, 9 months ago
D i mean 48
upvoted 1 times
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enpuna
5 years, 10 months ago
D is correct, - 64 subcarriers follow, o 12 zero subcarriers on sides and in center. o 48 data subcarriers per symbol. o 4 pilot subcarriers per symbol for synchronization and tracking.
upvoted 2 times
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xtrattitude4u
5 years, 10 months ago
The question is not specific enough. With 802-11g or 802.11a it will be 48 subcarriers, but 802-11n expands it to 52 subcarriers. Each 20-MHz OFDM channel has 48 subcarriers to carry data in parallel. The 802.11n amendment increased the 20-MHz channel throughput by increasing the number of data subcarriers to 52.
upvoted 1 times
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C (25%)
B (20%)
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