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These are the answers to LinkedIn Linux Skill Assessment Answers free certification course. These answers have been updated recently and are 100% correct. The final exam is on Monday, April. All answers are 100%.

LinkedIn Linux Assessment Answers

Q1. Linux file access control lists (ACLs) are _.

  •  discretionary access control system permissions layered over standard Linux permissions
  •  mandatory access control system permissions layered over standard Linux permissions
  •  a type of firewall for Linux
  •  the same as standard Linux permissions

Q2. What does this command string do?find / -size +10M -exec ls -l {} ;

  •  It finds all files using ls -l and hands them off to the find command to display.
  •  It finds all files older than 10 minutes and long lists them using the ls command.
  •  It finds all files larger than 10 MB and long lists them using the ls command.
  •  It uses the ls command to find all files in the filesystem matching the {} wildcard.

Q3. What would this locate command show?locate –regexp ‘^/usr.*pixmaps.*jpg$’

  •  all files in a directory named pixmaps
  •  all files ending in “.jpg”
  •  all file paths that start with “/usr”, include the word “pixmaps”, and end with “.jpg”
  •  all file paths that include “/usr/pixmaps” and end with “.jpg”

Q4. To mount a drive by its ID, what command would you use first to retrieve it?

  •  df -h
  •  listid
  •  ls -l
  •  blkid

Q5. How would you describe PCP (Performance Co-Pilot)?

  •  It is an application testing suite used to profile programming code.
  •  It is a local command used for monitoring local system resources in real time.
  •  It is a set of tools, services, and libraries for gathering and analyzing performance measures.
  •  It is a tool designed to change system configuration for purposes of optimization.

Q6. When using iproute2, how do you show routing information for an IPv6 network?

  •  route -ipv6
  •  route
  •  ip -6 route show
  •  ip route show

Q7. Which command allows you to do packet analysis from the command line?

  •  wireshark
  •  ethtool
  •  netstat
  •  tcpdump

Q8. What would this command output?ps -e –format uid,pid,ppid,%cpu,cmd

  •  the user ID, process ID, parent process ID, CPU usage, and command name of a process
  •  the user ID, group ID, parent process ID, CPU usage, and command name of a process
  •  the UUID, process ID, parent process ID, CPU usage, and command name of a process
  •  all of these answers

Q9. Which command will tell you how long a system has been running?

  •  log
  •  uptime
  •  runtime
  •  access

Q10. You want to resolve a long list of DNS names using dig. What should you do?

  •  Create a text file including all names and use the -f option of dig.
  •  Type in each query manually.
  •  Write a shell script to send multiple dig queries to the DNS server.
  •  Save the DNS names in an SQL database and process it with dig.

Q11. What command is used to determine the amount of disk usage for a directory?

  •  find
  •  fdisk
  •  du
  •  df

Q12. Which command in Bash executes the last line in the shell history that starts with ls?

  •  !
  •  !!
  •  !*
  •  !ls

Q13. The ssh-copy-id command copies _ to the remote host.

  •  both private and public keys
  •  the ssh public key
  •  the ssh private key
  •  a fingerprint file

Q14. A backup drive was created using dd to make a bit-for-bit copy. When the drive is inserted into an iSCSI target before it is booted up, the data appears to be missing. What happened?

  •  The backup drive is corrupted and needs to be re-created.
  •  When the backup drive was duplicated, the label was as well. When booted, the system mounted the old duplicated drive by its identical label.
  •  There is a conflict between the physical location of the backup drive and the original drive.
  •  The backup process went wrong, and the old drive was duplicated over the original drive.

Q15. What is the key difference between a redirect (>) and piping to the tee command?

  •  The tee command sends output only to STDOUT and STDERR.
  •  A redirect sends output to STDOUT and a file, whereas a tee sends output only to STDOUT.
  •  Nothing, they are the same.
  •  The tee command sends output to STDOUT and a file, whereas a redirect sends output only to a file.

Q16. Packages can be downloaded but not installed with yum or dnf by specifying which option?

  •  None of these answers. yum does not support downloading packages without installing them.
  •  –downloaddir
  •  -d
  •  –downloadonly

Q17. What character class is equal to this set?[0-9]

  •  [[:alnum:]]
  •  [[:digit:]]
  •  [[:alpha:]]
  •  [[:num:]]

Q18. What does the /etc/nsswitch.conf file manage?

  •  priority of one DNS server over another
  •  per network interface DNS server configuration
  •  alternative DNS services
  •  sources for name service information

Q19. When archiving files, which command will preserve all file attributes including ACLs and SELinux security context?

  •  zip
  •  tar
  •  archive
  •  gzip

Q20. Assume the variable myNumber holds a string consisting of 10 digits. What will this command output?echo \$myNumber | sed -e ‘s/^[[:digit:]][[:digit:]][[:digit:]]/(&)/g’

  •  It will only match digits—and since the string has only digits, the command will output the same number without changes.
  •  It will output the same 10-digit number, but every digit will be inside parentheses.
  •  It will output the entire 10-digit number inside parentheses.
  •  It will output the same 10-digit number, but the first 3 digits will be inside parentheses.

Q21. In a systemd-based OS, you can change the system hostname by editing /etc/hostname manually and then doing what?

  •  Restart dhcpd.
  •  Run /etc/hostname.
  •  Nothing, the system notices automatically.
  •  Notify systemd to update it by restarting the systemd-hostnamed service.

Q22. When would this system cron job run its task?0 1 * * *

  •  every minute of the hour
  •  every hour of every day
  •  every day at 1:00 AM
  •  only on Mondays

Q23. ifconfig has been deprecated. What command is now recommended for changing IP addresses in the live config?

  •  netconf
  •  ipconfig
  •  ipman
  •  ip

Q24. You are managing an Apache web server on a system using SELinux. By default it cannot read personal webpages in users’ home directories. What SELinux boolean would you set to allow this?

  •  apache_enable_homedirs
  •  httpd_enable_userdirs
  •  httpd_enable_homedirs
  •  httpd_enable_userhome_dirs

Q25. What command would you use to resize an LVM volume group to include an additional physical volume?

  •  vgadd
  •  vgresize
  •  vgappend
  •  vgextend

Q26. Why doesn’t passwd -l keep a user from logging in via other methods?

  •  The passwd command is not used for locking passwords.
  •  There is no password -l option.
  •  It locks only the password, not the account, so users can still authenticate with keys or other methods.
  •  It does lock the account, keeping users from logging in even if they are using other authentication methods.

Q27. When a user deletes a file using the rm command, Linux will _.

  •  always ask for confirmation
  •  back up the file before it deletes the file
  •  ask for confirmation if configured to do so
  •  never ask for confirmation

Q28. What is a major advantage of using Logical Volume Management (LVM)?

  •  Access to a drive is faster than with standard partitions.
  •  Volumes can be resized smaller without unmounting them.
  •  Repairing filesystem errors is easier than with standard partitions.
  •  Volumes can be resized even if the free space is not contiguous.

Q29. In the Bash shell, what is the difference between piping into | and piping into |&?

  •  Piping into | pipes both stdout and stderr. Piping into |& pipes only stderr.
  •  Piping into | pipes stdout. Piping into |& pipes stdout and stderr.
  •  Piping into | pipes both stdout and stderr. Piping into |& pipes only stdout.
  •  Piping into | pipes stdout. Piping into |& pipes all open file descriptors.

Q30. Why is the passwd command able to modify the /etc/passwd file?

  •  The kernel identifies it as one of the names of extended commands.
  •  It has the same name as the file it modifies.
  •  It has the SUID permission mode and is owned by root.
  •  It is a system administration command.

Q31. To remove all ACLs from a directory , use setfacl with which options?

  •  -d
  •  -k
  •  -b
  •  -x

Q32. In an extended regular expression, you would use (pattern){3} to match three instances of the pattern. How would you match the same thing with an extended glob?

  •  3(pattern)
  •  {0,3}(pattern}
  •  Occurrence quantifiers are not supported in Bash’s version of extended globs, so this is not possible.
  •  {3}(pattern})

Q33. What is one major difference between brace expansion and globs?

  •  Globs create a list; brace expansion matches pattern.
  •  Brace expansion requires files to exist; globs do not.
  •  Brace expansion creates a list; globs mart the list of pathnames.
  •  Globs get processes first and brace expansion later.

Q34. Which choice will not print “Hello World” in the terminal?

  • [x] myVar = 5[[ $myVar -lt 10 ]] && echo ” Hello World”
  • [ ] myVar = 5[[ $myVar -lt 10 ]] || echo ” Hello World”
  • [] myVar = 5[[ $myVar -gt 10 ]] && echo ” Hello World”
  • [x] myVar = 5[[ $myVar -gt 10 ]] || echo ” Hello World”

Q35. What is not inherited by child process?

  •  shell aliases
  •  userid
  •  environmental variables
  •  scheduling priority

Q36. What is the /etc/hosts file used for?

  •  resolving the local name
  •  blocking sites using iptables
  •  setting the hostname
  •  configuring DNS name servers

Q37. What NFS option allows the root user to access NFS shares as the root user?

  •  no_admin_squash
  •  no_root_squash
  •  allow_root_access
  •  all_squash

Q38. You send an email to a remote client using the following syntax. What will be in the body of the email?
date | mail -s “This is a remote test” user1@rhhost1.localnet.com

  •  “This is a remote test”
  •  the date, the time, and the words “This is a remote test”
  •  The email subject shows “This is a remote test” but the body of the email will be empty.
  •  the current date and time

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