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# 1  
Old 12-29-2012
Linux UNIX question

Pleas I want answer this question or reference or link website can find answer to
this question?



1. We consider that we are running on a UNIX system which uses ACL as a mechanism for file protection. Where is the protection information of the file stored?

2. In UNIX, each device is represented by a device, give an example of a file representing the hard disk storage device. Give the full listing of this file using the "ls -l" command. What are the protection flags (rwx) for this file and WHY are they like this? What would happen if the protection flags were equal to rw-rw-rw ?

3. What is the definition of MAC Times for UNIX systems? provide an example about the difference between the M flag and C flag.

4. A system administrator suspects that there is an attack on his machine; he needs to make a backup of the files to check when they have been modified. For this purpose he uses the "cp -r" instruction to copy the root directory. What is the problem with this and what other instruction should the administrator use in order to avoid this problem?

------------------------------------------------

1. What is a "two-factor" authentication?
2. Provide a full example of two-factor authentication where one factor is a password.
3. Could we use the mobile phone as part of this two-factor authentication?
4. Is "google" authentication a two-factor authentication system? What is the main problem with this device?


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I am find answer when search on internet but i can't find all "Full Answer "

Pleas help me............. I need this information
# 2  
Old 12-29-2012
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