My first guess is preventive and reactive.
A longer answer includes lists of antivirus, antispam, intrusion countermeasure, proper network settings and OS updates. Many of them can be found in Linux blogs, SANS security white papers, Cnet free downloads and DriverGuide.com
If you're in the government, and you really need to know this information, each vendor has to apply for their own certification, so you should be asking the vendor. It can be extremely secure, or it can be wide open.
A non-networked Linux system is probably around a C2, but I don't think anyone has actually forked over the money required to have it certified.
Linux's kernel is generally very secure. Root permissions are necessary to do many critical tasks on the operating system, and by default this account cannot be logged in to. Since it is open source any vulnerabilities can be discovered and patched quickly, unlike in proprietary operating systems.
It defines security and distribution.
grub ana LILO are the two boot loader in Linux
two types hard linking and soft linking
what are the two main types of environment
Link Counts In linux there are basically two types 1.soft links 2.hard links
there are two main types the marine and freshwater
There are two types of interface.. 1. User Interface 2. Application Interface
Linux and windows are two types of operating systems.. And Intel and AMD Make two different types of processors.
The General Assembly and the Security Council are the two main bodies of the UN.
The two main types of economy are Command and Traditional.
The two main types of friction are kinetic and static.
the two main types of communications are emailing and socialising