Linux Foundation LFCS Exam - Topic 5 Question 111 Discussion

Actual exam question for Linux Foundation's LFCS exam

Question #: 111
Topic #: 5

With IPv6, how many bits have been used for the interface identifier of an unicast address? (Specify the number using digits only.)

A64

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Suggested Answer: A

by Angelo at Apr 05, 2026, 01:15 AM

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Lezlie

13 days ago

Definitely 64. It’s half of the total address space.

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Kerry

18 days ago

Yeah, 64 bits for the interface identifier. Makes sense with IPv6.

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Crista

23 days ago

I think it's 64 bits. Seems straightforward.

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Alishia

28 days ago

Are you guys sure about that? Seems low.

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Josephine

1 month ago

Yup, 64 bits is correct!

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Willard

1 month ago

Wait, really? I thought it was more!

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Detra

3 months ago

Totally agree, it's 64 bits.

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Quinn

3 months ago

64 bits, for sure!

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Jerrod

4 months ago

I’m pretty certain it’s 64 bits for the interface identifier, but I should double-check my notes just to be safe.

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Jade

4 months ago

I’m a bit confused; I thought it might be 128 bits total, but I think the interface part is 64 bits.

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Kerry

4 months ago

I remember practicing a question like this, and I believe it was also about the 64 bits for the interface identifier.

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Edna

4 months ago

I think the interface identifier for IPv6 unicast addresses is 64 bits, but I’m not 100% sure.

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