Question 1

What is a purpose of an SSH host key?

Accepted Answer

A)  It must be sent by any SSH client in addition to a user key in order to identify the client's host. 
B)  It provides the server's identity information to connecting SSH clients. 
C)  It is the root key by which all user SSH keys must be signed. 
D)  It authenticates any user that logs into a remote machine from the key's host. 
E)  It is used by system services like cron, syslog or a backup job to automatically connect to remote hosts. 
A)  It must be sent by any SSH client in addition to a user key in order to identify the client's host. 
B)  It provides the server's identity information to connecting SSH clients. 
C)  It is the root key by which all user SSH keys must be signed. 
D)  It authenticates any user that logs into a remote machine from the key's host. 
E)  It is used by system services like cron, syslog or a backup job to automatically connect to remote hosts.

Question 2

Which of the following commands lists the dependencies of a given dpkg package?

Accepted Answer

A)  apt-cache depends-on package 
B)  apt-cache dependencies package 
C)  apt-cache depends package 
D)  apt-cache requires package 
A)  apt-cache depends-on package 
B)  apt-cache dependencies package 
C)  apt-cache depends package 
D)  apt-cache requires package

Question 3

When using rpm --verify to check files created during the installation of RPM packages, which of the following information is taken into consideration? (Choose THREE correct choices.)

Accepted Answer

A)  Timestamps 
B)  MD5 checksums 
C)  Inodes 
D)  File sizes 
E)  GnuPG signatures 
A)  Timestamps 
B)  MD5 checksums 
C)  Inodes 
D)  File sizes 
E)  GnuPG signatures

Question 4

Which of the following commands will print the last 10 lines of a text file to the standard output?

Accepted Answer

A)  cat -n 10 filename 
B)  dump -n 10 filename 
C)  head -n 10 filename 
D)  tail -n 10 filename 
A)  cat -n 10 filename 
B)  dump -n 10 filename 
C)  head -n 10 filename 
D)  tail -n 10 filename

Question 5

On a regular users workstation the route command takes a long time before printing out the routing table. Which of the following errors does that indicate?

Accepted Answer

A)  The local routing information may be corrupted and must be re-validated using a routing protocol. 
B)  One of the routers in the routing table is not available which causes the automatic router failure detection mechanism (ARF-
D)  to wait for a timeout. 
C)  There may accidentally be more than one default router in which case a default router election has to be done on the network in order to choose one router as the default. 
D)  DNS resolution may not be working as route by default tries to resolve names of routers and destinations and may run into a timeout. 
A)  The local routing information may be corrupted and must be re-validated using a routing protocol. 
B)  One of the routers in the routing table is not available which causes the automatic router failure detection mechanism (ARF-
D)  to wait for a timeout. 
C)  There may accidentally be more than one default router in which case a default router election has to be done on the network in order to choose one router as the default. 
D)  DNS resolution may not be working as route by default tries to resolve names of routers and destinations and may run into a timeout.

Question 6

Which file inside the CUPS configuration directory contains the definition of the printers?

Accepted Answer

A)  cups-devices.conf 
B)  snmp.conf 
C)  printcap.conf 
D)  printers.conf 
E)  cupsd.conf 
A)  cups-devices.conf 
B)  snmp.conf 
C)  printcap.conf 
D)  printers.conf 
E)  cupsd.conf

Question 7

Which of the following pieces of information of an existing file is changed when a hard link pointing to that file is created?

Accepted Answer

A)  File size 
B)  Modify timestamp 
C)  Link count 
D)  Inode number 
E)  Permissions 
A)  File size 
B)  Modify timestamp 
C)  Link count 
D)  Inode number 
E)  Permissions

Question 8

Which of the following environment variables overrides or extends the list of directories holding shared libraries?

Accepted Answer

A)  LD_LOAD_PATH 
B)  LD_LIB_PATH 
C)  LD_LIBRARY_PATH 
D)  LD_SHARE_PATH 
E)  LD_RUN_PATH 
A)  LD_LOAD_PATH 
B)  LD_LIB_PATH 
C)  LD_LIBRARY_PATH 
D)  LD_SHARE_PATH 
E)  LD_RUN_PATH

Question 9

After running the command umount /mnt, the following error message is displayed: umount: /mnt: device is busy. What is a common reason for this message?

Accepted Answer

A)  The kernel has not finished flushing disk writes to the mounted device. 
B)  A user has a file open in the /mnt directory. 
C)  Another file system still contains a symlink to a file inside /mnt. 
D)  The files in /mnt have been scanned and added to the locate database. 
E)  The kernel thinks that a process is about to open a file in /mnt for reading. 
A)  The kernel has not finished flushing disk writes to the mounted device. 
B)  A user has a file open in the /mnt directory. 
C)  Another file system still contains a symlink to a file inside /mnt. 
D)  The files in /mnt have been scanned and added to the locate database. 
E)  The kernel thinks that a process is about to open a file in /mnt for reading.

Question 10

Which of the following may occur as a consequence of using the command ifconfig? (Choose THREE correct choices.)

Accepted Answer

A)  New name servers may be added to the resolver configuration. 
B)  Network interfaces may become active or inactive. 
C)  The routing table may change. 
D)  IP addresses may change. 
E)  The system's host name may change. 
A)  New name servers may be added to the resolver configuration. 
B)  Network interfaces may become active or inactive. 
C)  The routing table may change. 
D)  IP addresses may change. 
E)  The system's host name may change.

Question 11

Which of the following commands kills the process with the PID 123 but allows the process to "clean up" before exiting?

Accepted Answer

A)  kill -PIPE 123 
B)  kill -KILL 123 
C)  kill -STOP 123 
D)  kill -TERM 123 
A)  kill -PIPE 123 
B)  kill -KILL 123 
C)  kill -STOP 123 
D)  kill -TERM 123

Question 12

What is the correct command to extract the contents of the archive file download.bz2?

Accepted Answer

A)  unpack download.bz2 
B)  unzip2 download.bz2 
C)  bunzip2 download.bz2 
D)  unzip download.bz2 
E)  uncompress download.bz2 
A)  unpack download.bz2 
B)  unzip2 download.bz2 
C)  bunzip2 download.bz2 
D)  unzip download.bz2 
E)  uncompress download.bz2

Question 13

Which of the following options for the kernel's command line changes the systemd boot target to rescue.target instead of the default target?

Accepted Answer

A)  systemd.target=rescue.target 
B)  systemd.runlevel=rescue.target 
C)  systemd.service=rescue.target 
D)  systemd.default=rescue.target 
E)  systemd.unit=rescue.target 
A)  systemd.target=rescue.target 
B)  systemd.runlevel=rescue.target 
C)  systemd.service=rescue.target 
D)  systemd.default=rescue.target 
E)  systemd.unit=rescue.target

Question 14

Which character in the password field of /etc/passwd is used to indicate that the encrypted password is stored in /etc/shadow?

Accepted Answer

A)  * 
B)  - 
C)  s 
D)  x 
A)  * 
B)  - 
C)  s 
D)  x

Question 15

Which of the following commands can be used to display the inode number of a given file?

Accepted Answer

A)  inode 
B)  ls 
C)  ln 
D)  cp 
A)  inode 
B)  ls 
C)  ln 
D)  cp

Question 16

Which of the following commands will send output from the program myapp to both standard output (stdout) and the file file1.log?

Accepted Answer

Question 17

In the vi editor, which of the following commands will copy the current line into the vi buffer?

Accepted Answer

A)  c 
B)  cc 
C)  1c 
D)  yy 
E)  1y 
A)  c 
B)  cc 
C)  1c 
D)  yy 
E)  1y

Question 18

Where are user specific crontabs stored?

Accepted Answer

A)  In the database file /etc/crontab.db which is shared by all users. 
B)  As individual per-user files within /var/spool/cron. 
C)  As individual per-user files in /etc/cron.user.d. 
D)  In the .crontab file in the user's home directory. 
E)  In the file /var/cron/ user-crontab which is shared by all users. 
A)  In the database file /etc/crontab.db which is shared by all users. 
B)  As individual per-user files within /var/spool/cron. 
C)  As individual per-user files in /etc/cron.user.d. 
D)  In the .crontab file in the user's home directory. 
E)  In the file /var/cron/ user-crontab which is shared by all users.

Question 19

Each entry in a crontab must end with what character?

Accepted Answer

A)  Tab 
B)  Space 
C)  Backslash 
D)  Newline 
A)  Tab 
B)  Space 
C)  Backslash 
D)  Newline

Question 20

Which of the following are commonly used Mail Transfer Agent (MTA) applications? (Choose THREE correct choices.)

Accepted Answer

A)  Postfix 
B)  Procmail 
C)  Sendmail 
D)  Exim 
E)  SMTPd 
A)  Postfix 
B)  Procmail 
C)  Sendmail 
D)  Exim 
E)  SMTPd

Exam 1: Linux Foundation Certified System Administrator