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Cisco 400-007 Exam - Topic 5 Question 57 Discussion

Actual exam question for Cisco's 400-007 exam

Question #: 57
Topic #: 5

[All 400-007 Questions]

Which two descriptions of CWDM are true? (Choose two)

Atypically used over long distances, but requires optical amplification

Buses the 850nm band

Callows up to 32 optical earners to be multiplexed onto a single fiber

Dshares the same transmission window as DWDM

EPassive CWDM devices require no electrical power

Show Suggested Answer

Suggested Answer: D, E

by Carman at Jan 22, 2025, 11:35 PM

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Pearlene

9 months ago

Not sure about the 850nm band thing, seems off to me.

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Elise

9 months ago

Passive CWDM devices are super efficient, no power needed!

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Willie

10 months ago

Wait, does it really share the same window as DWDM?

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Val

10 months ago

Totally agree, but I thought it needed amplification for long distances?

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Tasia

10 months ago

CWDM can multiplex up to 32 channels!

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Stevie

10 months ago

I definitely recall that passive CWDM devices don’t need power, so option E should be one of the correct answers.

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Eric

11 months ago

I’m a bit confused about the transmission windows. I thought CWDM and DWDM were different in that regard, so option D seems off to me.

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Major

11 months ago

I think option C sounds familiar because I practiced a question about multiplexing with CWDM before.

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Jutta

11 months ago

I remember CWDM is often used for shorter distances, so I'm not sure about option A.

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Lavonna

11 months ago

Wait, I'm a little confused - does CWDM really use the 850nm band? I thought it was in the 1271-1611nm range. Better double-check that one.

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Davida

11 months ago

I'm confident I can get this one right. CWDM is known for its low-cost and passive components, so that's a key detail to look for.

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Almeta

11 months ago

Okay, I remember CWDM uses a wider channel spacing than DWDM, so that's a good clue. I'll focus on the options that mention the wavelength bands and channel count.

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Michel

11 months ago

Hmm, I'm a bit unsure about the differences between CWDM and DWDM. I'll need to think carefully about which options are true for CWDM specifically.

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Johnetta

11 months ago

This looks like a straightforward question on CWDM. I'll start by reviewing what I know about the key characteristics of CWDM.

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Cordelia

2 years ago

I'm going with C and E, no doubt. 32 carriers and no power required? Sign me up for that CWDM goodness!

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Rolande

1 year ago

User 2: Definitely, having 32 carriers on one fiber without needing power is a game changer.

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Fernanda

1 year ago

User 1: I agree, C and E sound like the best options for CWDM.

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Mary

2 years ago

Haha, A and B are just trolling us. CWDM is all about that 1550nm band, not the 850nm stuff. And long distances? Nah, that's what DWDM is for.

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Taryn

1 year ago

User 2: Totally agree, and it's not for long distances either. That's DWDM territory.

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Amos

2 years ago

User 1: Yeah, A and B are definitely misleading. CWDM is all about the 1550nm band.

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Lanie

2 years ago

Hmm, I think C and D are the right choices. CWDM may share the same transmission window as DWDM, but it definitely allows 32 carriers. Who needs optical amplification anyway?

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Carin

1 year ago

Definitely, C and D are the right choices. CWDM is efficient in allowing multiple carriers without the need for optical amplification.

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Lucille

1 year ago

I think you're right. CWDM shares the same transmission window as DWDM, but it does allow for multiple carriers.

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Beatriz

1 year ago

Yeah, optical amplification is not needed for CWDM. It's great that passive CWDM devices require no electrical power.

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Dominga

1 year ago

I agree, C and D are the correct choices. CWDM can definitely multiplex up to 32 carriers.

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Malcolm

2 years ago

C and E are the correct answers. CWDM allows up to 32 optical carriers on a single fiber, and passive CWDM devices don't need electrical power. The other options are incorrect.

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Chanel

2 years ago

Yes, E is also true. Passive CWDM devices don't need electrical power.

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Sol

2 years ago

I think C is correct, CWDM allows multiple optical carriers on a single fiber.

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Scarlet

2 years ago

I'm not sure about B, though. I think it uses different bands for CWDM.

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Sherita

2 years ago

I agree with you, Ashleigh. I also think E is true because passive CWDM devices don't need power.

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Ashleigh

2 years ago

I think C is true because CWDM allows multiple optical channels on one fiber.

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