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Essential System Services
This topic addresses the following:
- Solve printing issues and delete jobs from the printing queues.
- Fundamentals for Mail transfer agent (MTA);
- Monitoring printers & printing through CUP;
- Be aware of syslog and syslog-ng;
- Deal with the systemd journal and filter its data;
- Maintaining time for systems by setting the hardware clock;
- Configure different time zones;
- Logging for different systems by using rsyslog;
NEW QUESTION 121
Which of the following looks like a correct entry in the /etc/hosts file?
- A. 127.0.0.1 localhost.localdomain localhost
- B. localhost localhost.localdomain 127.0.0.1
- C. localhost 127.0.0.1 localhost.localdomain
- D. localhost.localdomain localhost 127.0.0.1
- E. localhost.localdomain 127.0.0.1 localhost
Answer: A
NEW QUESTION 122
Which directory holds the files that configure the xinetd service when using several configuration files instead of an integrated configuration file? (Specify the full path to the directory.)
Answer:
Explanation:
/etc/xinetd.d/, /etc/xinetd.d
NEW QUESTION 123
Each entry in a crontab must end with what character?
- A. Tab
- B. Backslash
- C. Space
- D. Newline
Answer: D
NEW QUESTION 124
Which of the following describes the Linux ping packet or datagram?
- A. UDP datagram with a protocol type
- B. UDP datagram with a payload
- C. ICMP packet with a payload
- D. IP packet with a packet type
- E. ICMP packet with a message type
Answer: E
NEW QUESTION 125
Which command, available with all MTAs, is used to list the contents of the MTA's mail queue? (Specify ONLY the command without any path or parameters.)
Answer:
Explanation:
mailq, /usr/bin/mailq, sendmail -bp, /usr/sbin/sendmail -bp, /usr/lib/sendmail -bp, sendmail, /usr/sbin/sendmail, /usr/lib/sendmail
NEW QUESTION 126
Which command is used to add an empty group to the system? (Specify ONLY the command without any path or parameters.)
Answer:
Explanation:
groupadd, /usr/sbin/groupadd
NEW QUESTION 127
Which command is used to set restrictions on the size of a core file that is created for a user when a program crashes?
- A. ulimit
- B. core
- C. edquota
- D. quota
Answer: A
NEW QUESTION 128
Which option in the /etc/ntp.conf file specifies an external NTP source to be queried for time information?
(Specify ONLY the option without any values or parameters.)
Answer:
Explanation:
server
NEW QUESTION 129
FILL BLANK
Which file, if present, must contain all users that are allowed to use the cron scheduling system? (Specify the full name of the file, including path.)
Answer:
Explanation:
crontab
NEW QUESTION 130
FILL BLANK
Which command, available with all sendmail-compatible MTAs, is used to list the contents of the MTA's mail queue? (Specify only the command without any path or parameters.)
Answer:
Explanation:
mailq
NEW QUESTION 131
A French user has installed the French language pack, but currencies are still being displayed with a leading '$' sign in his spreadsheets. What must be done to fix this?
- A. Edit /etc/currency.
- B. Alter the locale.
- C. Reinstall the French language pack.
- D. Set the timezone correctly.
Answer: B
NEW QUESTION 132
On a system using systemd-journald, which of the following commands add the message Howdy to the system log? (Choose two.)
- A. logger Howdy
- B. journalctl add Howdy
- C. append Howdy
- D. systemd-cat echo Howdy
- E. echo Howdy > /dev/journal
Answer: B
NEW QUESTION 133
To exclude all log messages of a given logging facility, you should use a logging priority of _____ .
Answer:
Explanation:
none
NEW QUESTION 134
Which of the following commands shows the current color depth of the X Server?
- A. cat /etc/X11
- B. xcdepth
- C. xwininfo
- D. xcd
- E. xcolordepth
Answer: C
NEW QUESTION 135
Which commands can you use to change a user's account aging information? (Choose THREE correct answers.)
- A. chage
- B. usermod
- C. chsh
- D. chattr
- E. passwd
Answer: A,B,E
NEW QUESTION 136
Given the following excerpt of the sudo configuration:
jane ANY=NOPASSWD: /bin/kill, /bin/id, PASSWD: /sbin/fdisk
Which of the following statements are true? (Choose three.)
- A. Jane can run /bin/kill without specifying a password.
- B. Jane can run /sbin/fdisk after specifying root's password.
- C. Jane can run /bin/id only after specifying her password.
- D. Jane can run /bin/id without specifying her password.
- E. Jane can run /sbin/fdisk after specifying her password.
Answer: A,D,E
NEW QUESTION 137
Why is the correct configuration of a system's time zone important?
- A. Because the environment variables LANG and LC_MESSAGES are, by default, set according to the time zone.
- B. Because the conversion of Unix timestamps to local time relies on the time zone configuration.
- C. Because the time zone is saved as part of the modification times of files and cannot be changed after a file is created.
- D. Because NTP chooses servers nearby based on the configured time zone.
Answer: B
NEW QUESTION 138
Which of the following commands can be used to display the local routing table? (Choose TWO correct answers.)
- A. route
- B. dig
- C. netstat
- D. trackroute
- E. ifconfig
Answer: A,C
NEW QUESTION 139
In which file, if present, must all users be listed that are allowed to use the cron scheduling system? (Specify the full name of the file, including path.)
Answer:
Explanation:
/etc/cron.allow
NEW QUESTION 140
Which of the following states can NetworkManager show regarding the system's network connectivity?
(Choose two.)
- A. up
- B. full
- C. portal
- D. login-required
- E. firewalled
Answer: B,C
NEW QUESTION 141
Please specify the top directory containing the configuration files for the CUPS printing system. (Specify the full path to the directory.)
Answer:
Explanation:
/etc/cups, /etc/cups/
NEW QUESTION 142
An administrator wants to determine the geometry of a particular window in X, so she issues the
__________ -metric command and then clicks on the window.
Answer:
Explanation:
/usr/bin/xwininfo
NEW QUESTION 143
You suspect that a gateway machine on your network has failed but you are unsure which machine. Which command will help locate the problem?
- A. ps
- B. netstat
- C. traceroute
- D. ifconfig
- E. nslookup
Answer: C
NEW QUESTION 144
FILL BLANK
Which environment variable is used by an X11 client to determine the X Server to connect to?
(Specify only the variable name without any preceding commands or values.)
Answer:
Explanation:
DISPLAY
NEW QUESTION 145
What is true about the file /etc/localtime?
- A. It is created and maintained by the NTP service based on the location of the system's IP address.
- B. It is a symlink to /sys/device/clock/ltime and always contains the current local time.
- C. It is either a symlink to or a copy of a timezone information file such as
/usr/share/zoneinfo/Europe/Berlin. - D. After changing this file, newtzconfig has to be run to make the changes effective.
- E. It is a plain text file containing a string such as Europe/Berlin
Answer: C
NEW QUESTION 146
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