Eccouncil 312-38 Exam - Topic 6 Question 105 Discussion

Actual exam question for Eccouncil's 312-38 exam

Question #: 105
Topic #: 6

Identify the spread spectrum technique that multiplies the original data signal with a pseudo random noise spreading code.

AFHSS

BDSSS

COFDM

DISM

Show Suggested Answer

Suggested Answer: B

The spread spectrum technique that involves multiplying the original data signal with a pseudo-random noise spreading code is known as Direct Sequence Spread Spectrum (DSSS). In DSSS, the data signal is combined with a higher data-rate bit sequence, also known as a chipping code, which divides the data according to a spreading ratio. The chipping code is a pseudo-random code sequence that spreads the signal across a wider bandwidth. This process allows the signal to be more resistant to interference and eavesdropping.

by Rikki at Apr 03, 2025, 02:57 PM

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Samuel

2 months ago

I thought FHSS was more common, but DSSS makes sense.

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Ceola

2 months ago

Wait, isn't OFDM also a spreading technique?

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Heidy

3 months ago

Really? I always thought DSSS was just for specific applications.

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Marica

3 months ago

Totally agree, it's the right answer.

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Allene

3 months ago

It's definitely DSSS!

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Oliva

3 months ago

I’m not confident, but I feel like ISM is more about frequency bands rather than a spreading technique.

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Shayne

4 months ago

I’m leaning towards DSSS too, but I keep mixing it up with OFDM. They both seem related to spreading techniques.

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Dallas

4 months ago

I remember practicing a question like this, and I think FHSS was mentioned as well, but it uses frequency hopping, not a spreading code.

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Pok

4 months ago

I think the answer might be DSSS since it involves spreading the signal with a pseudo random noise code, but I’m not completely sure.

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Dominga

4 months ago

Wait, I'm a little confused. Isn't OFDM also a spread spectrum technique? I'll have to review my notes to make sure I understand the differences between these methods. Gotta be careful on this one.

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Domitila

4 months ago

Okay, I think I've got this. DSSS is the technique that uses a pseudo-random code to spread the signal across a wider bandwidth, right? That matches the description in the question. I'm feeling pretty confident about this one.

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Jules

5 months ago

Hmm, I'm a bit unsure about this one. The options seem pretty technical and I'm not totally familiar with the different spread spectrum techniques. I'll have to think it through carefully.

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Delmy

5 months ago

This one seems pretty straightforward. The key is that the question mentions multiplying the original data signal with a pseudo random noise spreading code, which sounds like the definition of DSSS (Direct Sequence Spread Spectrum).

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Arthur

10 months ago

You know, if this was a trick question, I'd say C) OFDM just to mess with the instructor. But in reality, B) DSSS is the correct answer, no doubt about it.

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Remona

8 months ago

Yeah, DSSS multiplies the original data signal with a pseudo random noise spreading code.

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Lavera

9 months ago

I agree, DSSS is the correct spread spectrum technique.

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Azzie

10 months ago

I think the answer is B) DSSS.

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Rolande

10 months ago

Hmm, OFDM is for multi-carrier transmission, not spread spectrum. And ISM is just a frequency band, not a technique. B) DSSS is the winner here!

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Vincenza

8 months ago

And ISM is just a frequency band, not a technique.

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Brunilda

8 months ago

Hmm, OFDM is for multi-carrier transmission, not spread spectrum.

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Pete

8 months ago

Yes, DSSS is the spread spectrum technique that multiplies the original data signal with a pseudo random noise spreading code.

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Edison

9 months ago

I think B) DSSS is the correct answer.

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Annabelle

9 months ago

Yes, you're right. DSSS is the spread spectrum technique that multiplies the original data signal with a pseudo random noise spreading code.

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Kristofer

9 months ago

I think B) DSSS is the correct answer.

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Cassie

10 months ago

I'm not sure, but I think FHSS is also a spread spectrum technique. Can someone explain why DSSS is the correct answer?

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Ryan

10 months ago

I agree with Emeline, DSSS is the spread spectrum technique that uses pseudo random noise spreading code.

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Barrett

11 months ago

I'm pretty sure FHSS is the one that hops around the frequency spectrum, not DSSS. B is the right answer for sure.

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Rashad

9 months ago

Got it, thanks for clarifying!

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Art

9 months ago

So, B) DSSS is the correct answer.

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Mauricio

9 months ago

Yeah, DSSS is the spread spectrum technique that multiplies the original data signal with a pseudo random noise spreading code.

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Adolph

9 months ago

I think FHSS is the one that hops around the frequency spectrum.

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Antonio

9 months ago

DSSS is the spread spectrum technique we're looking for.

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Veta

9 months ago

So, the answer is definitely B.

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Elden

9 months ago

Yeah, DSSS multiplies with pseudo random noise spreading code.

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Francoise

10 months ago

I think you're right, FHSS hops around frequencies.

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Lavina

11 months ago

B) DSSS is the way to go! Spreading the signal with a pseudo-random code is the essence of direct sequence spread spectrum.

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Emeline

11 months ago

I think the answer is B) DSSS.

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