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NEW QUESTION # 216
What is true regarding a default route?
Answer: A
NEW QUESTION # 217
Which crontab entry could be used to set the system time at regular intervals?
Answer: A
Explanation:
The crontab entry that could be used to set the system time at regular intervals is the one that uses the ntpdate command to synchronize the system clock with a Network Time Protocol (NTP) server. The ntpdate command takes one or more NTP server names or IP addresses as arguments and adjusts the system clock accordingly12. The crontab entry B specifies that the ntpdate command should be executed at the first minute of the zeroth hour (i.e., 00:01) of every day of every month of every weekday, using the NTP server ntp1.digex.net34. This will ensure that the system time is updated daily with a reliable source.
The other crontab entries are either invalid or ineffective for setting the system time at regular intervals. The date command can be used to display or set the system date and time, but it requires a specific format for the argument, not an NTP server name5. The runcron and settime commands are not standard Linux commands and their functionality is unknown. The $d, $t, and $24 variables are also undefined and meaningless in this context.
NEW QUESTION # 218
What is the conventional purpose of Linux UIDs that are lower than 100?
Answer: E
NEW QUESTION # 219
Which of the following commands can be used to limit the amount of memory a user may use?
Answer: B
Explanation:
The ulimit command can be used to limit the amount of memory a user may use. The ulimit command is a shell builtin that allows the user to view or modify the resource limits imposed by the operating system. The resource limits can affect the maximum size of files, the maximum number of processes, the maximum amount of CPU time, and the maximum amount of virtual memory a user can access.
To limit the amount of memory a user may use, the -v option can be used with the ulimit command. The -v option sets the maximum amount of virtual memory available to the current shell and its children in kilobytes. For example, the command ulimit -v 1000000 would limit the virtual memory to 1 GB. The -m option can also be used to set the maximum resident set size, which is the amount of physical memory used by a process, but this option is not supported by all systems.
The ulimit command can be used interactively in a shell session, or it can be placed in a shell initialization file, such as .bashrc or .profile, to apply the limits to all future shell sessions. The ulimit command can also be used in conjunction with the /etc/security/limits.conf file, which allows the system administrator to set global or per-user resource limits for all users and processes. The /etc/security/limits.conf file can specify hard and soft limits for each resource, as well as the scope of the limit, such as user, group, or domain.
The other commands listed are not related to limiting the amount of memory a user may use. The umask command sets the default file permissions for newly created files and directories. The usermod command modifies the user account information, such as the home directory, the login shell, or the password expiration date. The passwd command changes the user password. The chage command changes the password aging information, such as the minimum and maximum number of days between password changes, or the number of days before the password expires. Reference:
ulimit(1) - Linux manual page
How to limit user environment with ulimit Linux command
Control server access using hosts.allow and hosts.deny files
NEW QUESTION # 220
On a system running the KDE Display Manager, when is the /etc/kde4/kdm/Xreset script automatically executed?
Answer: B
Explanation:
The /etc/kde4/kdm/Xreset script is a script that runs as root after a user's X session exits. It can be used to perform some cleanup tasks or other actions that need to be done when the user logs out of the graphical environment. For example, it can reassign the ownership of the console to root, or shut down the system if desired. The /etc/kde4/kdm/Xreset script is part of the KDE Display Manager (kdm), which is a graphical login manager for X. KDM can be configured to run this script by setting the Reset key in the [X-*-Core] section of the /etc/kde4/kdm/kdmrc configuration file. Reference:
kdm.options - configuration options for X display manager
kdm(1) - kdm - Debian jessie - Debian Manpages
debian - How to get system to shutdown when Xorg is quit? - Unix ...
NEW QUESTION # 221
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