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Linux Foundation LFCS Exam - Topic 1 Question 57 Discussion

Actual exam question for Linux Foundation's LFCS exam

Question #: 57
Topic #: 1

[All LFCS Questions]

Which of the following commands overwrites the bootloader located on /dev/sda without overwriting the partition table or any data following it?

Add if=/dev/zero of=/dev/sda bs=512

Bdd if=/dev/zero of=/dev/sda bs=512 count=1

Cdd if=/dev/zero of=/dev/sda bs=440 count=1

Ddd if=/dev/zero of=/dev/sda bs=440

Show Suggested Answer

Suggested Answer: C

by Cyril at Apr 19, 2023, 03:26 PM

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Dominga

9 months ago

C is interesting, but I’d stick with B for clarity.

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Karl

9 months ago

Count 1 is key here, right? Seems too simple.

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Caitlin

9 months ago

Wait, are you sure? I thought it was A.

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Marion

9 months ago

Definitely B, that’s the safest option!

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Adell

10 months ago

I think it's B, only overwrites the bootloader.

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Norah

10 months ago

I think it’s definitely between C and D, but I can't recall if the bootloader is 440 bytes or if it needs the extra space.

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Carlene

10 months ago

I’m a bit confused; I thought the bootloader was always at the start of the disk, so wouldn’t A overwrite more than just the bootloader?

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Henriette

10 months ago

I remember practicing with dd commands, and I feel like option C is the right one since it specifies the bootloader size.

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Tamra

10 months ago

I think the command that only affects the bootloader is the one with a count of 1, but I'm not sure if it's the one with bs=512 or bs=440.

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Tambra

10 months ago

I feel pretty confident about this one. The scenario states that Delilah consented to the collection and use of her personal data, which would include her business contact info. As long as it was used internally and not shared externally, I think that's allowed.

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Lizette

10 months ago

Hmm, I think the key here is identifying the project interfaces and their potential impact on the budget. That should help guide the discussion with stakeholders.

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Jeff

1 year ago

Wait, are we trying to fix the bootloader or just play a prank on the computer? Cause I know a few 'creative' options that might be more fun...

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Crista

1 year ago

C) dd if=/dev/zero of=/dev/sda bs=440 count=1

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Denny

1 year ago

B) dd if=/dev/zero of=/dev/sda bs=512

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Cassie

1 year ago

A) dd if=/dev/zero of=/dev/sda bs=512 count=1

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Dyan

1 year ago

Option A looks like it'll do the trick. Gotta love the good ol' zero-fill method. Simple and effective!

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Merilyn

1 year ago

User 4: Let's go with option A then.

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Burma

1 year ago

User 3: I agree, it's a simple and effective solution.

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Fatima

1 year ago

User 2: Yeah, zero-fill method is always reliable.

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Francine

1 year ago

User 1: I think option A is the way to go.

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Quentin

1 year ago

User 4: Let's go with option A then.

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Tambra

1 year ago

User 3: I agree, it's simple and effective.

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Hildegarde

1 year ago

User 2: Yeah, zero-fill method is always reliable.

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Carole

1 year ago

User 1: I think option A is the way to go.

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Virgilio

1 year ago

Hmm, I'm leaning towards Option D. Why go for a specific count when you can just wipe the whole bootloader, right? Get the job done in one fell swoop!

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Virgie

1 year ago

I'm gonna go with Option B. Better safe than sorry, right? No need to risk the whole partition.

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Willow

1 year ago

But wouldn't overwriting just 440 bytes be risky? I think it's safer to overwrite just the first 512 bytes with count=1.

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Sheldon

1 year ago

Option C is the correct answer. It overwrites only the bootloader without touching the partition table or data.

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Kenneth

1 year ago

Option C is the correct answer. It overwrites only the bootloader without touching the partition table or data.

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Jamie

1 year ago

D) dd if=/dev/zero of=/dev/sda bs=440

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Alonzo

1 year ago

C) dd if=/dev/zero of=/dev/sda bs=440 count=1

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Trina

1 year ago

B) dd if=/dev/zero of=/dev/sda bs=512 count=1

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Elena

1 year ago

A) dd if=/dev/zero of=/dev/sda bs=512

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Aleisha

1 year ago

I disagree, I believe the correct answer is C) dd if=/dev/zero of=/dev/sda bs=440 count=1.

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Willow

1 year ago

I think the answer is B) dd if=/dev/zero of=/dev/sda bs=512 count=1.

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