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general questions-CompArch,OS,Networks&Security

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darknessice

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Would appreciate even short answers, Thanks in advance!
Sorry for my bad english.

1. what are the best locations to put the cache regarding the cpu (close as possible?)
2.what is the most likely explanation for how comes the Stuxnet/Flame (a virus?) was injected to Iran's Nuclear Plants / Electricity grid, manually?
3.Is it possible to enforce a wireless connection without leaving signs for this?
4.what is the maximum height in air which still makes it possible to establish Wireless connection with computers on land?
I guess there's no limitation.

5. what are the most modern ways for a virus to trick the kernel /antivirus so it will get OS/Superuser/Adminastrator Privileges
so it's code will be executed (specifically, in kernel mode) ? (already checked the wikipedia page for viruses)

6. except for SIMD properties & lot of threads available, what is the explanation for having less/much smaller cache, no branch predictors, and a very diffrent number of pipeline stages in a GPGPU's (such as Nvidia's) in comprasion to Desktop/Laptop CPUS

7. except for memory stalls,Bandwith,branch misspredictions,frequency and source voltage, what properties affects the performance & efficiency of a program?
 

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