Which configuration describes Linux running on an i686 user space on a 64-bit x86_64 CPU?

Study for the Wireshark Block 5 Exam. Prepare with flashcards and multiple choice questions, each offering hints and explanations. Ace your exam with the best resources!

Multiple Choice

Which configuration describes Linux running on an i686 user space on a 64-bit x86_64 CPU?

Explanation:
The main idea is that you can run a 32-bit user-space Linux (i686) on a 64-bit x86_64 CPU because a 64-bit processor can execute 32-bit code in compatibility mode. Describing this as Linux i686 on x86_64 matches exactly: the i686 part is the 32-bit user-space, while x86_64 is the 64-bit host CPU. The other options either imply a 64-bit user-space on a 64-bit CPU, or a generic 32-bit Linux without specifying the 64-bit host, or refer to a different OS/hardware altogether, so they don’t describe the same 32-bit user-space-on-64-bit-CPU setup.

The main idea is that you can run a 32-bit user-space Linux (i686) on a 64-bit x86_64 CPU because a 64-bit processor can execute 32-bit code in compatibility mode. Describing this as Linux i686 on x86_64 matches exactly: the i686 part is the 32-bit user-space, while x86_64 is the 64-bit host CPU. The other options either imply a 64-bit user-space on a 64-bit CPU, or a generic 32-bit Linux without specifying the 64-bit host, or refer to a different OS/hardware altogether, so they don’t describe the same 32-bit user-space-on-64-bit-CPU setup.

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