QUESTION: 6
What happens when the following command is run?
# authconfig - - passalgo = md5 - - update

A. It produces the MD5 checksum of the input data.
B. It configures the MD5 checksum for newly authored documents
C. It converts the stdio input to MD5 algorithm.
D. It changes the user password hashing algorithm to MD5.
Answer(s): D
Explanation: To configure the Linux system to use theMD5algorithm, enter:
# authconfig --passalgo=MD5--update
Note: The default algorithm for storing password hashes in /etc/shadow is MD5. I was told to
use SHA-512 hashing algorithm. How do I set password hashing using the SHA-256 and SHA-
512 under CentOS or Redhat Enterprise Linux 5.4?
You need to use authconfig command to setup SHA-256/512 hashing. This command provides
a simple method of configuring /etc/sysconfig/network to handle NIS, as well as /etc/passwd and
/etc/shadow, the files used for shadow password support. Basic LDAP, Kerberos 5, and SMB
(authentication) client configuration is also provided.
Display Current Hashing Algorithm
Type the following command:
# authconfig --test | grep hashing
Sample outputs:
password hashing algorithm is md5
Configure Linux Server To Use The SHA-512
To configure the Linux system to use the SHA-512 algorithm, enter:
# authconfig --passalgo=sha512 --update

QUESTION: 7
As user bob, you have logged in to the system on a terminal and issued the following command
to ake the top command run in the background.
[bob@host - ] top&
You exit from the terminal and log back as bob into the system at the same terminal. How is the
background job affected?
A. The background job gets the foreground as soon as bob logs into the system.
B. The background job is suspended temporarily from the job and resumes when user bob logs
back in to the system.
C. The background job starts running in the background again as soon as bob logs into the
system.
D. The background job wil not be affected.
E. The background job is deleted from the job pool and does not get listed using jobs command.

6

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