Eccouncil 212-81 Exam - Topic 7 Question 70 Discussion

Actual exam question for Eccouncil's 212-81 exam

Question #: 70
Topic #: 7

[All 212-81 Questions]

What is the largest key size that AES can use?

A256

B56

C512

D128

Show Suggested Answer

Suggested Answer: A

256

https://en.wikipedia.org/wiki/Advanced_Encryption_Standard

For AES, NIST selected three members of the Rijndael family, each with a block size of 128 bits, but three different key lengths: 128, 192 and 256 bits.

by Benedict at May 03, 2026, 12:12 AM

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Levi

4 days ago

C) 512? That's not even an option for AES.

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Tegan

9 days ago

B) 56 seems way too low.

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Kathrine

14 days ago

Agreed! AES-256 is the strongest.

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Linwood

19 days ago

I think it's A) 256. Feels right.

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Farrah

24 days ago

Really? 256 seems a bit excessive, doesn't it?

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Allene

29 days ago

128 is just the minimum, right?

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Thersa

1 month ago

I thought it was 512? Guess I was wrong.

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Deeann

1 month ago

Definitely not 56, that's way too small.

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Jamie

1 month ago

It's 256 bits, for sure!

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Leah

2 months ago

I definitely recall that AES supports 256 bits as the maximum key size, so I’m going with A.

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Remona

3 months ago

I’m a bit confused; I thought AES could go up to 512 bits, but that doesn’t seem right now that I think about it.

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Henriette

3 months ago

I remember practicing a question about AES key sizes, and I believe 128, 192, and 256 are the options, so it must be 256.

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Katy

4 months ago

I think the largest key size for AES is 256 bits, but I'm not entirely sure.

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