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Linux

Q1. To mount a drive by its ID, what command would you use first to retrieve it?

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

Q2. 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

Q3. When using iproute2, how do you show routing information for an IPv6 network?

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

Q4. 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.

Q5. 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"

Q6. Which command allows you to do packet analysis from the command line?

  • wireshark
  • ethtool
  • netstat
  • tcpdump

Q7. Which command will tell you how long a system has been running?

  • log
  • uptime
  • runtime
  • access

Q8. 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.

Q9. 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.

Q10. 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

Q11. Which command in Bash executes the last line in the shell history that starts with ls?

  • !
  • !!
  • !*
  • !ls

Q12. 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

Q13. What command is used to determine the amount of disk usage for a directory?

  • find
  • fdisk
  • du
  • df

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. 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

Q17. 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.

Q18. 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

Q19. What character class is equal to this set?

[0-9]

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

Q20. When archiving files, which command will preserve all file attributes including ACLs and SELinux security context?

  • zip
  • tar
  • archive
  • gzip

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

  • vgadd
  • vgresize
  • vgappend
  • vgextend

Q23. 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

Q24. ifconfig has been deprecated. What command is now recommended for changing IP addresses in the live config?

  • netconf
  • ipconfig
  • ipman
  • ip

Q25. 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

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. 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.

Q28. 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.

Q29. 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

Q30. 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.

Q31. 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.

Q32. To remove all ACLs from a directory , use setfacl with which options?

  • -d
  • -k
  • -b
  • -x

Q33. 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"

Q34. What is not inherited by child process?

  • shell aliases
  • userid
  • environmental variables
  • scheduling priority

Q35. 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

Q36. 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" [email protected]
  • "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

Q37. What is the /etc/hosts file used for?

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

Q38. 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})