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Q49. What is the standard port number for the unencrypted IMAP service?
Q50. Why is the root file system mounted read-only during boot and remounted with write permission later on?
A. Because if problems with the root file system are detected during the boot, fsck can be run, without risk of damage.
B. Because this way crackers cannot collect information about root with boot sniffers
C. To avoid writing to the disk, unless the root password is known.
D. To avoid other operating systems overwriting the linux root partition
E. Because the disk has its own write protection that cannot change by the operating system.
Q51. In what mode is your FTP session when the client side makes the connections to both the data and command ports of the FTP server?
Q52. All machines outside the network are able to send emails through the server to addresses not served by that server. If the server accepts and delivers the email, then it is a(n) _______.
Answer: open email relay
Q53. The internal network (192.168.1.0-192.168.1.255) needs to be able to relay email through the site's sendmail server. What line must be added to /etc/mail/access to allow this?
A. 192.168.1.0/24 RElAY
B. 192.168.1 RElAY
C. 192.168.1.0/24 OK
D. 192.168.1 OK
Q54. What tool scans log files for unsuccessful login attempts and blocks the offending IP addresses with firewall rules?
Q55. In which directory can all parameters available to sysctl be found? (Provide the full path)
Q56. What is the name of the dovecot configuration variable that specifies the location of user mail?