XK0-005 · Question #239
A systems administrator is receiving errors while trying to install a popular virtualization software. The software specifications state the processor needs to support virtualization with Intel…
The correct answer is C. The processor does not support hyperthreading. The provided processor flags indicate support for virtualization and encryption, but the absence of the 'ht' flag suggests the processor does not support hyperthreading, which is a required specification.
Question
A systems administrator is receiving errors while trying to install a popular virtualization software. The software specifications state the processor needs to support virtualization with Intel instructions. Additional requirements state the processor must accelerate encryption/decryption and use hyperthreading. Given the following output about the processor:
fpu ume depse tsu msr pae mce cx8 apic sep mtrr pae mca cmov pat pse36 cflusm mmx fxsr sse sse2 ht syscall nx rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt aes xsave avx rdrand hypervisor lahf_lm fsgsbase Which of the following is the MOST likely reason for the errors?
Options
- AThe processor supports AMD instructions rather than Intel.
- BThe processor cannot accelerate decryption.
- CThe processor does not support hyperthreading.
- DThe processor is running inside a virtual machine.
How the community answered
(38 responses)- A5% (2)
- B26% (10)
- C55% (21)
- D13% (5)
Why each option
The provided processor flags indicate support for virtualization and encryption, but the absence of the 'ht' flag suggests the processor does not support hyperthreading, which is a required specification.
The presence of flags like `aes`, `avx`, and `hypervisor` is consistent with Intel processor features for virtualization and encryption, not exclusively AMD.
The `aes` flag in the output indicates that the processor supports AES-NI (Advanced Encryption Standard New Instructions), which accelerates both encryption and decryption operations.
The provided `flags` output includes `hypervisor`, `aes`, `pclmulqdq`, `ssse3`, `sse4_1`, `sse4_2`, and `avx`, which collectively cover Intel virtualization and encryption acceleration. However, the `ht` flag, which signifies Intel Hyper-Threading Technology, is explicitly missing from the list, making it the most likely unmet requirement for the virtualization software.
The `hypervisor` flag in the CPU output indicates the processor is running inside a virtual machine, but the specific requirement for hyperthreading (the `ht` flag) is a direct capability of the CPU itself, and its absence is a more precise reason for failure based on the listed requirements.
Concept tested: CPU feature flags for virtualization and hyperthreading
Source: https://www.kernel.org/doc/Documentation/x86/cpu-flags.txt
Topics
Community Discussion
No community discussion yet for this question.