RHCSA Cert Guide Ch. 1-10
Red Hat Enterprise Linux 5 supports LUKS encryption. True or False? - correct answer False. Red Hat Enterprise Linux 6 is the only version that officially supports LUKS encryption.
In Red Hat Enterprise Linux 6, SELinux is set to Enforcing by default during the installation. True or False? - correct answer True. In Red Hat Enterprise Linux 6, the default for SELinux is Enforcing during installation (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.
Which remote management service is installed by default? Can you name the port that it uses? - correct answer 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.
You can install software packages only after Red Hat Enterprise Linux is installed. True or False? - correct answer False. The package selection screen allows you to install any software you want during the installation process as long as you have access to the correct packages or repositories.
The default partition layout includes only basic partitions. True or False? - correct answer False. The default partition layout for Red Hat Enterprise Linux 5 or 6 includes the use of LVM.
Which file contains all messages generated during installation that can be used for troubleshooting if the need arises? - correct answer 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.
GRUB has three stages. Can you name them? - correct answer Stage 1: During this stage, the primary bootloader is read into memory by the BIOS from the MBR. Stage 1.5: During this stage, the bootloader is read into memory by the stage 1 bootloader (only if necessary). Stage 2: During this stage, the bootloader reads the operating system or kernel. What option at the GRUB boot menu can you use to append something to a kernel? - correct answer By entering the GRUB boot menu, you can choose the a option to append something to the kernel command-line options.
The old SysInit scripts have been replaced in Red Hat Enterprise Linux 6 for what new boot utility? - correct answer Upstart. The Upstart utility is now used in the boot process for Red Hat Enterprise Linux 6.
Runlevel 0 reboots the system. True or False? - correct answer False. Runlevel 0 halts the system. Runlevel 6 reboots the system.
If your system crashes and becomes unbootable, you have to reinstall the whole operating system. True or False? - correct answer False. Most boot issues can be resolved by entering rescue mode and repairing
the problem.
What command can you use to manage system services? - correct answer The service command is used to start, stop, and manage system services.
What command disables the SSH service from running when the system boots? - correct answer chkconfig sshd off
How can you list all services on the system to tell whether they will boot during startup? - correct answer
chkconfig—list
What does S12rsyslog in the /etc/rc.d/rc2.d directory mean? - correct answer 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.
How can you verify the status of the SSH service after the system has booted? - correct answer service sshd statuts
What command and option can you use to enable a service to start on boot? - correct answer Use the chkconfig command to enable or disable services during the boot process. The on option enables the service and off disables it.
Red Hat Enterprise Linux 5 supports LUKS encryption. True or False? - correct answer False. Red Hat Enterprise Linux 6 is the only version that officially supports LUKS encryption.
In Red Hat Enterprise Linux 6, SELinux is set to Enforcing by default during the installation. True or False? - correct answer True. In Red Hat Enterprise Linux 6, the default for SELinux is Enforcing during installation (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.
Which remote management service is installed by default? Can you name the port that it uses? - correct answer 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.
You can install software packages only after Red Hat Enterprise Linux is installed. True or False? - correct answer False. The package selection screen allows you to install any software you want during the installation process as long as you have access to the correct packages or repositories.
The default partition layout includes only basic partitions. True or False? - correct answer False. The default partition layout for Red Hat Enterprise Linux 5 or 6 includes the use of LVM.
Which file contains all messages generated during installation that can be used for troubleshooting if the need arises? - correct answer 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.
GRUB has three stages. Can you name them? - correct answer Stage 1: During this stage, the primary bootloader is read into memory by the BIOS from the MBR. Stage 1.5: During this stage, the bootloader is read into memory by the stage 1 bootloader (only if necessary). Stage 2: During this stage, the bootloader reads the operating system or kernel. What option at the GRUB boot menu can you use to append something to a kernel? - correct answer By entering the GRUB boot menu, you can choose the a option to append something to the kernel command-line options.
The old SysInit scripts have been replaced in Red Hat Enterprise Linux 6 for what new boot utility? - correct answer Upstart. The Upstart utility is now used in the boot process for Red Hat Enterprise Linux 6.
Runlevel 0 reboots the system. True or False? - correct answer False. Runlevel 0 halts the system. Runlevel 6 reboots the system.
If your system crashes and becomes unbootable, you have to reinstall the whole operating system. True or False? - correct answer False. Most boot issues can be resolved by entering rescue mode and repairing
the problem.
What command can you use to manage system services? - correct answer The service command is used to start, stop, and manage system services.
What command disables the SSH service from running when the system boots? - correct answer chkconfig sshd off
How can you list all services on the system to tell whether they will boot during startup? - correct answer
chkconfig—list
What does S12rsyslog in the /etc/rc.d/rc2.d directory mean? - correct answer 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.
How can you verify the status of the SSH service after the system has booted? - correct answer service sshd statuts
What command and option can you use to enable a service to start on boot? - correct answer Use the chkconfig command to enable or disable services during the boot process. The on option enables the service and off disables it.
