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You want to display the value of a shell variable called service after assigning a value as shown:
SERVICE =ACCT S
Which two settings will display the name of the variable and its value?
A. set | grep service
B. echo $SERVICE
C. env | grep SERVICE
D. env $SERVICE
E. set $SERVICE
Correct Answer: BC
C: env – set the environment for command invocation
If no utility operand is specified, the resulting environment shall be written to the standard output, with one name= value pair per line.
Examine these statements and their output taken right after successful install of Oracle Linux:
[[email protected] /] rpm q firstboot Firstboot -1.110.10-1.0.2.e16.x86_64 [root @FAROUT /] # chkconfig – – list firstboot
Firstboot 0:off 2:off 3:off 4:off 5:off 6;off
[[email protected] /] # /etc/sysconfig/firstboot RUN_FIRSTBOOT=NO What is the conclusion?
A. The option to run firstboot was deselected during Oracle Linux installation.
B. The system was installed with desktop graphical packages and rebooted and the firstboot utility ran successful.
C. Firstboot never ran in any run level because the service is turned off for all run levels.
D. The system was installed without selecting desktop graphical packages, thereby disabling firstboot from running.
Correct Answer: A
Firstboot is set to off for all levels.
The rm command below remove or delate the firstboot file in order to make sure the firstboot program running when we restart or reboot the Fedora machine.
[[email protected] ~]# rm /etc/sysconfig/firstboot
rm: remove regular file `/etc/sysconfig/firstboot\’? y [[email protected] ~]#
Then check and make sure that firstboot program or firstboot service is run when your Fedora startup/boot up.
Check firstboot services
[[email protected] ~]# chkconfig –list firstboot
firstboot 0:off 1:off 2:off 3:off 4:off 5:off 6:off
[[email protected] ~]#
Which three settings can be controlled by using the chage breemar command as the root user, to modify the parameters in the /etc/shadow file?
A. The expiration date of the breemar account
B. The number of days after the breemar account is locked, that it becomes expired
C. The maximum number of days that must elapse between password changes by the user breemar before the password becomes invalid
D. The number of days after the breemar account is locked, that it becomes unlocked
E. The minimum number of days that must elapse between password changes by the user breemar
F. The maximum number of failed login attempts on the breemar account before the account is locked
Correct Answer: ACE
A: chage -E, –expiredate EXPIRE_DATE
Set the date or number of days since January 1, 1970 on which the user\’s account will no longer be accessible.
CE: You need to use chage command to setup password aging. The chage command changes the number of days between password changes and the date of the last password change. This information is used by the system to determine when a user must change his/her password.
Which four statements are true about software on the Oracle Public YUM server?
A. It contains Oracle Linux installation ISO images.
B. It contains Oracle Linux binary RPM packages.
C. It contains Oracle Linux errata packages.
D. It contains Oracle Linux source RPM packages.
E. It contains beta Oracle Linux software packages.
F. It does not contain Unbreakable Enterprise Kernel packages.
Correct Answer: BCDF
The Oracle public yum server offers a free and convenient way to install the latest Oracle Linux packages as well as packages from the Oracle VM installation media via a yum client. Oracle provides all errata and updates for Oracle Linux via the Public Yum service, which includes updates to the base distribution, but does not include Oracle-specific software.
F: By default, all new installations of Oracle Linux 6 Update 5 are automatically configured to use the public yum update service. If you subsequently register the system with ULN, the public yum service is automatically disabled.
This MDADM output:
Which two aspects can be determined from this output?
A. A device failed and has been removed from this RAID set.
B. It is no longer possible to write to this RAID set.
C. Read and write performance is no longer optimal on this RAID set.
D. This RAID set was built without a spare device.
E. Only Write performance is no longer optimal on this RAID set.
Correct Answer: AD
Examine the command on its output: [[email protected] ~] # modprobe 璿 nfs Insmod /lib/modules/2.6.39-100.0.12.e16uek.x86_64/kernel/fs/nfs_common/nfs_acl.ko insmod /lob/ modules/2.6.39
100.0.12.e16uek.x86_64/kernel/net/sunrpc/auth_gss/auth_rpcgss.ko Insmod /lib/modules/2.6.39-100.0.12.e16uek.x86_64/kernel/fs/fscache/fscache/ko Insmod /lib/modules/2.6.39-100.0.12.e16uek.x86_64/kernel/fs/locked.ko Insmod /lib/modules/2.6.39-100.0.12.e16uek.x86_64/kernel/fs/nfs/nfs.ko Which two statements are true about the modprobe command?
A. It will load the nfs module if all the modules upon which it depends have been loaded.
B. It displays the dependency resolution for the nfs module and loads all the modules upon which nfs depends before loading the nfs module.
C. It verifies that the nfs module and all other modules that depend on the nfs module are installed.
D. It displays the dependency resolution that would occur if the nfs module were to be loaded using modprobe nfs.
E. It only loads the nfs module if all the modules upon which it depends have not been loaded yet.
Correct Answer: A
Reference: http://redhat.activeventure.com/8/customizationguide/ch-kernel-modules.html (kernel module utilities)
What is the main advantage of the Oracle Unbreakable Enterprise Kernel compared with the Red Hat compatible kernel?
A. It is more secure and, therefore, more difficult to hack.
B. It has a lower Mean Time Between Failures.
C. It provides higher availability for applications by reducing Mean Time to Recovery.
D. It scales better for more CPUS, memory, and Infiniband network connections.
Correct Answer: D
The Unbreakable Enterprise Kernel, for those who want to leverage the latest features from mainline Linux and boost performance and scalability. The Red Hat Compatible Kernel, for those who prefer strict Red Hat kernel ABI (kABI) compatibility.
Examine this output: # df 璽 nfs Filesystem Size Used Avail Use% Mounted on
o16:export 30G 21G 7.6G 74% /mnt
# 1s -1 /mnt/nfs.sh -rwxr-mr-x. 1 root root 22 May 8 16:37 /mnt/nfs.sh # file /mnt/nfs.sh
/mnt/nfs.sh: Bourne-Again shell script text executables
# /mnt/nfs.sh bash: /mnt/nfs.sh: Permission denied What is the reason for the error?
A. The file system was exported on host o16 using the ROOT_SQUASH option.
B. The /export filesystem was mounted with the NOEXEC option on host o16.
C. The filesystem mounted on /mnt was mounted with the NOEXEC option.
D. The filesystem was exported on host o16 by using the NO_ROOT_SQUASH option.
Correct Answer: A
Which two Statements are true concerning the configuration and use of cron and anacron?
A. Anacron jobs are used to make sure cron jobs run if the system had been down when they were meant to run.
B. All crontabs are held in the /etc/cron.d directory.
C. Cron jobs may run as frequently as once a minute.
D. Anacron jobs may run as frequently as once a minute.
E. The crond daemon looks for jobs only in /etc/crontab.
Correct Answer: CE
Note: Anacron is the cron for desktops and laptops.
Anacron does not expect the system to be running 24 x 7 like a server.
When you want a background job to be executed automatically on a machine that is not running 24 x 7, you should use anacron.
not D: /etc/anacrontab file has the anacron jobs mentioned in the following format.
period delay job-identifier command
Field 1 is Recurrence period: This is a numeric value that specifies the number of days.
N This can be any numeric value. N indicates number of days
You have a single network adapter called eth0.
DEVICE = eth0 BOOTPROTO=DHCP HWADR=BC:305B:C5:63;F1 NM_CONTROLLED=no ONBOOT=YES TYPE=Ethernet PEERDNS=no UUID=C9dba2e8-9faf-4b77-bbe2-92dd81dda1f9
Which two Statement:; are true concerning eth0 based on this configuration?
A. DHCP is used to obtain a lease on an IP address.
B. The dhclient command may only be used to obtain a lease at boot time.
C. dhclient does not override the contents of /etc/resolv.conf.
D. DNS is not used to resolve host names for this adapter.
E. dhclient overrides the contents of /etc/resolv.conf.
Correct Answer: A
where answer is one of the following:
yes — Modify /etc/resolv.conf if the DNS directive is set. If using DHCP, then yes is the default.
no — Do not modify /etc/resolv.conf.
Note: The “/etc/resolv.conf” file is used to configure the location of the DNS servers to be used for name resolution.
You want sendmail to deliver mail for these users:
In which sendmail configuration database can this requirement be defined?
Correct Answer: C
This database file maps mail addresses for virtual domains and users to real mailboxes. These mailboxes can be local, remote, aliases defined in /etc/mail/aliases, or files. This allows multiple virtual domains to be hosted on one machine.
The following example demonstrates how to create custom entries using that format:
[email protected] root
Which two conditions should be met in order to successfully configure an openssh client on Oracle Linux?
A. The openssh-server package must not be installed.
B. The openssh package must be installed.
C. The sshd daemon must not be started.
D. The openssh-client package must be installed.
E. The ssh-agent must be started.
F. ssh keys must be generated by any user using the ssh client.
Correct Answer: BD
To connect to an OpenSSH server from a client machine, you must have the openssh-clients and openssh packages installed on the client machine.
You use the chkconfig command to administer one of the services on your Oracle Linux system:
No changes have been made to the init script for the service.
Which two statements are true regarding the effects of Issuing this command?
A. The vncserver service is shut down.
B. The vncserver service configuration is disabled only for those run levels for which it is currently enabled.
C. The vncserver service configuration is disabled for run levels 2, 3, 4 and 5.
D. The vncserver service remains in the same state it was in before the command was issued.
E. The vncserver service configuration is disabled for run levels 3 and 5 only.
Correct Answer: AB
Examine the commands used by root to create the chrooted environments in the /jail directory:
# mkdir /jail/bin/jail/lib64
# cp /bin/bash/jail/bin
linux-vdso.so.1 => (0x00007fff68dff000)
libtinfo.so.5 => /lib64/libtinfo.so.5 (0x00000033e00000)
lid1.so.2 => /lib64/libc.so.6 (0x00000033e1600000)
# cp /lib64/libtinfo.so.5/jail/lib64
# cp /lib64/libd1.so.6 /jail/lib64
# cp /lib64/libc.so.6 /jail/lib64
# cp /lib64/id-linux-x86-64.so.2 /jail/lib64
The user root then issues this command:
# chroot /jail
What is the output from the cd, pwd, and 1s commands?
A. bash-4.1# cd bash-4.1# pwd /root bash-4.1# 1s bash” 1s: command not found
B. bash-4.1# cd bash: cd: /root: No such file or directory bash-4.1# pwd / bash-4.1 # 1s bash: 1s: command not found
C. bash-4.1# cd bash: cd: command not found bash: pwd: command not found bash-4.1# 1s
D. bash: 1s; # cd bash: cd: /root: unable to access chrooted file or directory /root bash-4.1# pwd / bash-4.1 # 1s bin lib64
E. bash-4.1# cd bash: cd: /root: No such file or directory bash-4.1# pwd / bash-4.1# 1s bin lib64
Correct Answer: A
What is the purpose of setting ONPARENT = no in an Interface configuration file located in /etc/sysconfig/ network-scripts?
A. To prevent a network interface from being brought up during system startup
B. To prevent a slave network interface from being brought up during system startup
C. To prevent an alias network interface from being brought up during system startup
D. To prevent a master network interface from being brought up during system startup
Correct Answer: C
The ONBOOT directive tells the network initialization scripts not to start a given interface.
If you need to stop a virtual interface from starting when the network interfaces are initialized, you need to set ONPARENT instead of ONBOOT to no.
Reference: Keep IP Aliases from Starting at Boot