Вопросы о безопасности виртуальных машин.

Жалоба
Вопрос

У меня несколько вопросов:
1. Полностью ли безопасно использование виртуальных ОС (например, на VirtualBox, Virtual PC)? Например, тестируя на нем программы, сомнительные для запуска или выход в интернет.
(т.е. безопасно ли это для реальной системы и ПК?)
2. Ставил виртуально систему Ubuntu, а в ней при установке просит подключение к интернету. Я не понимаю, у меня модем запускается ТОЛЬКО из его родной оболочки и никак по-другому. Как возможно подключение к интернету при загрузке или установке ОС, если ставить систему на реальном ПК, а не виртуальном? (учитывая то, что у меня USB-модем!).
3. Безопасно ли подключение к интернету в виртуальной ОС, используя NAT соединение, при подключенном интернете на реальном ПК?
(т.е. безопасно ли это действие для ПК со стороны хакерских атак и прочей "нечисти" интернета?)
4. Безопасно ли подключение к интернету в виртуальной ОС, НЕ используя сетевое соединение с реальной ОС, а подключаясь из установленной оболочки в виртуальной?
(т.е. безопасно ли для реальной ОС).
Дополнение #1 04.04.2012 2:58:29
Unname, о 4-м пункте...
Я ставил оболочку в виртуальной ОС и подключался оттуда. И просто сомневался, что этом может быть безопасным.

Дополнение #2 04.04.2012 3:02:10
FreeBlack, оболочка - тот софт, прилагающийся как обязательный к установке для запуска USB-модема. Вроде ее так и называют...

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