Test your basic knowledge |

RHCSA

Subjects : certifications, it-skills, rhcsa

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What option needs to be used with the mount command to mount an NFS resource?
The /proc directory. The /proc/sys directory is the place where you actually tune kernel parameters.
The rndc utility provides a method for managing the DNS server remotely and securely.
The -t nfs option is used with the mount command to mount NFS resources.
schedule one-time-only jobs

2. What command and option do you use to view the description of Boolean values?
You can use the remove or erase options with yum to remove a package.
semanage boolean -l
The two main config files are master.cf and main.cf.
entering rescue mode and repairing the problem.

3. What port on the firewall needs to be open for the TFTP server to work?
The TFTP server uses UDP port 69.
If you shrink a volume group or logical volume - there is a chance you could lose data depending on how much you shrink the volume.
After you connect to a hypervisor - you can use virsh list —all to list all virtual guests.
A soft limit acts like an alarm - signaling you when you are reaching your limit. If you don't specify a grace period - the soft limit is the max. A hard limit is required only when a grace period exists. It is the max limit you can hit before your g

4. What three components are needed to fully automate a kickstart installation?
By combining a TFTP server - PXE boot - and DHCP server - you can fully automate the kickstart installation process.
getsebool
You must open TCP ports 20 and 21 for the FTP server to function properly.
Public/private key authentication provides an additional layer of security because you need the correct key instead of just knowing someone's password. Passwords combined with public/private keys take the security one additional step.

5. Most boot issues can be resolved by...
entering rescue mode and repairing the problem.
Using the host option in the dhcpd.conf file allows you to reserve a client IP address based on its MAC address.
The NFS service uses TCP port 2049 by default.
Use the setgid flag to create the appropriate permissions (chmod 2770).

6. What command disables the SSH service from running when the system boots?
chkconfig sshd off
When the system starts up again - the cron service will run any jobs that were missed while the system was off. On Red Hat Enterprise Linux 5 - the anacron service handles this functionality.
A large warning message appears indicating that the key doesn't match the host you are connecting to. You have to remove the key/host pair from the known_hosts file to proceed.
createrepo

7. By default - what is the path to a user's home directory?

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8. What does the following firewall rule accomplish: iptables -I INPUT 5 -p tcp -m tcp --dport 80 -j ACCEPT?
Yum repository config files (.repo files) are located in the /etc/yum.repos.d directory. You can also make direct entries into the main /etc/yum.conf file.
The smbpasswd command is used to create Samba users.
The firewall rule is inserted into the fifth line of the iptables rules and opens up TCP port 80 (for the HTTP service) on the firewall to allow incoming connections.
The du and df commands are used to view available space on the system.

9. What command can you use to create your own repositories?
The VNC package for Red Hat Enterprise Linux 6 is tiger-vnc.
Using the host option in the dhcpd.conf file allows you to reserve a client IP address based on its MAC address.
The partprobe command forces the kernel to reread the partition table. You should always call it after making any changes to your system partitions.
createrepo

10. To create a RAID or LVM partition using kickstart
An ext3 file system has journaling built in to it - whereas the ext2 file system doesn't.
The gateway is incorrectly set - and the subnet of the host you are trying to reach is inaccessible.
Kickstart supports both basic and advanced partitioning (RAID/LVM).
A large warning message appears indicating that the key doesn't match the host you are connecting to. You have to remove the key/host pair from the known_hosts file to proceed.

11. What does the partprobe command do?
chkconfig xinetd --list
A virtual host is a way of hosting multiple sites using a single IP address.
The partprobe command forces the kernel to reread the partition table. You should always call it after making any changes to your system partitions.
Upstart. The Upstart utility is now used in the boot process for Red Hat Enterprise Linux 6.

12. Samba servers can...
defining a %pre section although it is rarely used
serve both files and printers to users
RAID 0 (Striping) - RAID 1 (Mirror) - and RAID 5 (Striping with parity).
The print option is used with both the fdisk and parted commands to display the current partition tables.

13. What happens to jobs that are scheduled to run while the system is off?
createrepo
export one or all resources
The VNC package for Red Hat Enterprise Linux 6 is tiger-vnc.
When the system starts up again - the cron service will run any jobs that were missed while the system was off. On Red Hat Enterprise Linux 5 - the anacron service handles this functionality.

14. Do you need to write changes to the disk when using the parted command? What about fdisk?
defining a %pre section although it is rarely used
The /var/log/audit/audit.log file contains all policy violations.
When you exit the parted utility - all your changes are automatically written to disk. With the fdisk command - you need to manually write your changes to disk for them to take effect.
getsebool -a | grep http

15. What is the superblock used for?
The five directories are BUILD - RPMS - SOURCES - SPECS - and SRPMS.
getfacl
used for kickstart and/or network installs
The superblock is a structure that contains metadata of the file system. If this becomes corrupt - you are in trouble.

16. What port does NFS use by default?
The NFS service uses TCP port 2049 by default.
You add your action to the end of the /home/user01/.bashrc file.
The smbpasswd command is used to create Samba users.
rpcbind service

17. What command and options can you use to update the time?
SSH is used for secure remote management of Linux systems.
The /var/liv/dhcpd/dhcpd.leases file contains all clients IP address currently in use.
The nfsstat command can be used to view NFS statistics.
After the ntpd service is stopped - you can use the ntpdate <server> command to update/sync the time.

18. What option at the GRUB boot menu can you use to append something to a kernel?
The /etc/fstab file.
createrepo
By entering the GRUB boot menu - you can choose the a option to append something to the kernel command-line options.
ifconfig

19. What command displays your current interfaces and IP address?
Enforcing during installation
You can use the authconfig-tui command or the authconfig command.
via the command line
ifconfig

20. The firewall service is...
Public/private key authentication provides an additional layer of security because you need the correct key instead of just knowing someone's password. Passwords combined with public/private keys take the security one additional step.
getsebool -a | grep http
DNS uses port 53.
enabled by default

21. Editing the /etc/xinetd.d/tftp file and enabling the service are the same as running the chkconfig tftp on command. Both of these actions...
The ping command can be used to verify connectivity to another host.
browseable option
have the same effect
The file system where ACLs will be implemented must be mounted with the acl option before ACLs will work properly.

22. What command can be used to view the queue for at service jobs?
atq
The dig - host - and ping commands can be used to test DNS server functionality.
mkfs.ext4
serve both files and printers to users

23. How can virtual hosts be used?
The /etc/hosts file is a local lookup file used to map IP addresses to hostnames if a DNS server isn't available.
rpcbind service
You can use the sudo command to run a command with elevated privileges provided you have the rights in the /etc/sudoers file.
If you are a hosting company or want to run multiple websites/applications from a single IP address - you can use virtual hosts to accomplish this.

24. A PXE server eases the automation process but isn't required for...
This chapter described tdbsm and smbpasswd back-end authentication.
chkconfig xinetd --list
kickstart installations to work
serve both files and printers to users

25. Is it possible to share files among groups - What permissions would you set on the directory to accomplish file sharing if possible?
Using the chcon command - you can change the context of a file to work with Apache.
mkfs.ext4
Use the setgid flag to create the appropriate permissions (chmod 2770).
The testparm command allows you to check for syntax errors in the /etc/samba/smb.conf file.

26. How can you check the currently mounted file systems?
ifconfig
The htpasswd command can be used to password-protect a web page.
The mount command lists all currently mounted file systems.
The nfsstat command can be used to view NFS statistics.

27. What command can you use to test the config files before starting the DNS service?
Upstart. The Upstart utility is now used in the boot process for Red Hat Enterprise Linux 6.
The VNC package for Red Hat Enterprise Linux 6 is tiger-vnc.
service named configtest
A large warning message appears indicating that the key doesn't match the host you are connecting to. You have to remove the key/host pair from the known_hosts file to proceed.

28. What are the three different types of RAID described in this chapter?
RAID 0 (Striping) - RAID 1 (Mirror) - and RAID 5 (Striping with parity).
The partprobe command forces the kernel to reread the partition table. You should always call it after making any changes to your system partitions.
generates errors under Red Hat Enterprise Linux 6
An A record translates translated hostnames to IP addresses - and a PTR record works the other way around.

29. The virt-install package allows you to manage virtual machines _____________. The virt-manager package allows you to manage virtual machines via a GUI interface.
PAM is used as a modular way to leverage security. In this chapter - the main function we discussed was for managing password policies and complexity.
via the command line
The file system where ACLs will be implemented must be mounted with the acl option before ACLs will work properly.
The chmod command is used to change the permissions of files and directories. The chown command is used to change the ownership of files and directories.

30. What does it mean if you ping a host and you receive the response Destination Unreachable?
The gateway is incorrectly set - and the subnet of the host you are trying to reach is inaccessible.
You add your action to the end of the /home/user01/.bashrc file.
Use the resize2fs command to grow a file system.
cat /proc/mdstat

31. What two commands are used for package management?
The user_list file can be used to limit which users have access to the FTP server.
The chmod command is used to change the permissions of files and directories. The chown command is used to change the ownership of files and directories.
The yum and rpm commands are used for package management.
have the same effect

32. Should you allow remote root access - Why or why not?

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33. What does S12rsyslog in the /etc/rc.d/rc2.d directory mean?
The grep -v ^# /etc/vsftpd/vsftpd.conf command shows you all the options currently being used with the FTP server.
The smbstatus command shows you currently mounted Samba resources.
When the system enters into runlevel 2 - the rsyslog service has a priority of 12 when starting. Anything with a lower number (or the same number and lower first letter) starts before the rsyslog service.
The /var/log/audit/audit.log file contains all policy violations.

34. Which file shows you all the client IP addresses?
A swap is scratch space on your file system used as virtual memory. A swap can be created as a partition or a device file.
Use the resize2fs command to grow a file system.
semanage boolean -l
The /var/liv/dhcpd/dhcpd.leases file contains all clients IP address currently in use.

35. In Red Hat Enterprise Linux 6 - the default for SELinux is _______________ (which can be changed after the installation completes). For Red Hat Enterprise Linux 5 - you were able to choose what mode you wanted SELinux to start in.
Enforcing during installation
Use the top command to view CPU and memory usage.
Use the chkconfig command to enable or disable services during the boot process. The on option enables the service and off disables it.
This chapter described tdbsm and smbpasswd back-end authentication.

36. What command can you use to validate the syntax of the Apache config file?
halts the system
service httpd configtest
Yum repository config files (.repo files) are located in the /etc/yum.repos.d directory. You can also make direct entries into the main /etc/yum.conf file.
DNS uses port 53.

37. What command can you use to manage system services?
The service command is used to start - stop - and manage system services.
The du and df commands are used to view available space on the system.
The tcpdump command is used to monitor network connections on different interfaces.
Typing the mail or mutt command allows you to read mail from the command line.

38. Are additional packages besides httpd required for a secure website - If so - what are they?
For Apache to run a secure site - the mod_ssl package is required to be installed.
This command reboots virtual guest Client04.
LUKS encryption
Public/private key authentication provides an additional layer of security because you need the correct key instead of just knowing someone's password. Passwords combined with public/private keys take the security one additional step.

39. What happens if you call the command from question 3 with the -c option after it has already been run?
Use the route command with the add option to create a static route.
halts the system
The file that stores usernames and their encrypted passwords is erased and replaced with a new file.
generates errors under Red Hat Enterprise Linux 6

40. What is the name of the package that allows you to install VNC?
The rpm command can operate in install - query - or verify modes.
You have the flexibility to resize and add new volumes on the fly. With basic partitions - any time that you want to make a change - you need to destroy the partition and create it again.
The VNC package for Red Hat Enterprise Linux 6 is tiger-vnc.
amount of RAM

41. What is the virsh command used for?
amount of RAM
The mount command lists all currently mounted file systems.
Use the setgid flag to create the appropriate permissions (chmod 2770).
The virsh command is used to manage virtual guests.

42. Through its main config file - SSH can be configured to...

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43. What command can be used to easily list all the options in the FTP main config file?
This chapter described tdbsm and smbpasswd back-end authentication.
The yum and rpm commands are used for package management.
The user_list file can be used to limit which users have access to the FTP server.
The grep -v ^# /etc/vsftpd/vsftpd.conf command shows you all the options currently being used with the FTP server.

44. The old SysInit scripts have been replaced in Red Hat Enterprise Linux 6 for what new boot utility?
You can use the sudo command to run a command with elevated privileges provided you have the rights in the /etc/sudoers file.
PAM is used as a modular way to leverage security. In this chapter - the main function we discussed was for managing password policies and complexity.
Upstart. The Upstart utility is now used in the boot process for Red Hat Enterprise Linux 6.
repquota

45. Which remote management service is installed by default?Can you name the port that it uses?
service dhcpd configtest
createrepo
The SSH service is almost always installed by default in Red Hat. It uses TCP port 22 - and this port is open on the default firewall rules.
generates errors under Red Hat Enterprise Linux 6

46. Red Hat Enterprise Linux 6 is the only version that officially supports _______
The /etc/dhcp/dhcpd.conf file is the main config file for the DHCP service.
LUKS encryption
support TCP Wrappers
The testparm command allows you to check for syntax errors in the /etc/samba/smb.conf file.

47. Before you work with quotas - what do you need to do to the file system?
The /etc/exports file needs to contain any directory that you want to export - including which options you'd like to use as well.
chkconfig sshd off
RAID 0 (Striping) - RAID 1 (Mirror) - and RAID 5 (Striping with parity).
The file system where quotas will be implemented must be mounted with the usrquota and grpquota options before quotas will work properly.

48. What two ports should be opened on the firewall for the FTP server to function properly?
support for TCP Wrappers
You can use the authconfig-tui command or the authconfig command.
By combining a TFTP server - PXE boot - and DHCP server - you can fully automate the kickstart installation process.
You must open TCP ports 20 and 21 for the FTP server to function properly.

49. What command do you use to change the permissions on a file or directory - To change ownership?
The chmod command is used to change the permissions of files and directories. The chown command is used to change the ownership of files and directories.
The grep -v ^# /etc/vsftpd/vsftpd.conf command shows you all the options currently being used with the FTP server.
The install.log.syslog file contains messages that are generated during the installation. If you run into trouble during the installation - this is a good place to start.
After you connect to a hypervisor - you can use virsh list —all to list all virtual guests.

50. Before you work with ACLs - what do you need to do to the file system?
getsebool
export one or all resources
By entering the GRUB boot menu - you can choose the a option to append something to the kernel command-line options.
The file system where ACLs will be implemented must be mounted with the acl option before ACLs will work properly.