Month: January 2021

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latest updated RedHat EX200 exam questions and answers

QUESTION 1
User mary must configure a task.
Requirement: The local time at 14:23 everyday echo “Hello World.”.
Correct Answer: Check the answer in the explanation.
crontab -u mary -e
23 14 * * * echo “Hello World.”

QUESTION 2
Whoever creates the files/directories on a data group owner should automatically be in the same group owner as data.
Correct Answer: Check the answer in the explanation.
1.
chmod g+s /data
2.
Verify using: ls -ld /data Permission should be like this: drwxrws— 2 root sysadmin 4096 Mar 16 18:08 /data If SGID bit
is set on directory then who every users creates the files on directory group owner automatically the owner of parent
directory. To set the SGID bit: chmod g+s directory To Remove the SGID bit: chmod g-s directory

QUESTION 3
Configure a cron Task.
User natasha must configure a cron job, local time 14:23 runs and executes: */bin/echo hiya every day.
Correct Answer: Check the anser in explanation.
crontab –e –u natasha 23 14/bin/echo hiya crontab -l -u natasha // view systemctlenable crond systemcdlrestart crond

QUESTION 4
Create the following users, groups, and group memberships:
A group named adminuser.
A user natasha who belongs to adminuser as a secondary group A user harry who also belongs to adminuser as a
secondary group.
A user sarah who does not have access to an interactive shell on the system, and who is not a member of adminuser,
natasha, harry, and sarah should all have the password of redhat.
Correct Answer: Check the anser in explanation.
groupadd sysmgrs
useradd -G sysmgrs Natasha
We can verify the newly created user by cat /etc/passwd) # useradd -G sysmgrs harry # useradd -s /sbin/nologin sarrh #
passwd Natasha # passwd harry # passwd sarrah

QUESTION 5
Make a swap partition having 100MB. Make Automatically Usable at System Boot Time.
Correct Answer: Check the anser in explanation.
Use fdisk /dev/hda ->To create new partition.
Type n-> For New partition
It will ask for Logical or Primary Partitions. Press l for logical.
It will ask for the Starting Cylinder: Use the Default by pressing Enter Key.
Type the Size: +100M ->You can Specify either Last cylinder of Size here.
Press P to verify the partitions lists and remember the partitions name. Default System ID is 83 that
means Linux Native.
Type t to change the System ID of partition.
Type Partition Number
Type 82 that means Linux Swap.
Press w to write on partitions table.
Either Reboot or use partprobe command.
mkswap /dev/hda? ->To create Swap File system on partition.
swapon /dev/hda? ->To enable the Swap space from partition.
free -m ->Verify Either Swap is enabled or not.
vi /etc/fstab/dev/hda? swap swap defaults 0 0
Reboot the System and verify that swap is automatically enabled or not.

QUESTION 6
Create a volume group, and set 8M as a extends. Divided a volume group containing 50 extends on volume group lv
(lvshare), make it as ext4 file system, and mounted automatically under /mnt/data. And the size of the floating range
should set between 380M and 400M.
Correct Answer: Check the anser in explanation.
# fdisk # partprobe # pvcreate /dev/vda6 # vgcreate -s 8M vg1 /dev/vda6 -s # lvcreate -n lvshare -l 50 vg1 -l # mkfs.ext4
/dev/vg1/lvshare # mkdir -p /mnt/data # vim /etc/fstab /dev/vg1/lvshare /mnt/data ext4 defaults 0 0 # mount -a # df -h

QUESTION 7
Notes:
NFS NFS instructor.example.com:/var/ftp/pub/rhel6/dvd
Correct Answer: Check the anser in explanation.
YUM http://instructor.example.com/pub/rhel6/dvd ldap http//instructor.example.com/pub/EXAMPLE-CA-CERT Install
dialog package. yum install dialog

QUESTION 8
Your System is going use as a router for 172.24.0.0/16 and 172.25.0.0/16. Enable the IP Forwarding.
1.
echo “1” >/proc/sys/net/ipv4/ip_forward
2.
vi /etc/sysctl.conf net.ipv4.ip_forward=1
Correct Answer: Check the anser in explanation.
/proc is the virtual filesystem, containing the information about the running kernel.
To change the parameter of running kernel you should modify on /proc. From Next reboot the system, kernel will take
the value from /etc/sysctl.conf.

QUESTION 9
Configure
your web services, download from http://instructor.example.com/pub/serverX.html And the services must be still running
after system rebooting.
Correct Answer: Check the anser in explanation.
cd /var/www/html wget http://instructor.example.com/pub/serverX.html mv serverX.html index.html /etc/init.d/httpd
restart chkconfig httpd on

QUESTION 10
Create a swap space, set the size is 600 MB, and make it be mounted automatically after rebooting the system
(permanent mount).
Correct Answer: Check the anser in explanation.
if=/dev/zero of=/swapfile bs=1M count=600 mkswap /swapfile /etc/fstab: /swapfile swap swap defaults 0 0 mount -a

QUESTION 11
Add user: user1, set uid=601 Password: redhat The user\\’s login shell should be non-interactive.
Correct Answer: Check the anser in explanation.
# useradd -u 601 -s /sbin/nologin user1 # passwd user1 redhat

QUESTION 12
Open kmcrl value of 5 , and can verify in /proc/ cmdline
Correct Answer: Check the anser in explanation.
# vim /boot/grub/grub.conf kernel/vmlinuz-2.6.32-71.el6.x86_64 ro root=/dev/mapper/GLSvgGLSrootrd_LVM_LV=GLSvg/GLSroot rd_LVM_LV=GLSvg/GLSswaprd_NO_LUKSrd_NO_MDrd_NO_DM
LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us crashkernel=auto rhgb quiet
kmcrl=5 Restart to take effect and verification: # cat /proc/cmdline ro root=/dev/mapper/GLSvg-GLSroot
rd_LVM_LV=GLSvg/GLSroot rd_LVM_LV=GLSvg/GLSswap rd_NO_LUKS rd_NO_MD rd_NO_DM
LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet kmcrl=5

QUESTION 13
Configure autofs.
Configure the autofs automatically mount to the home directory of LDAP, as required:
server.domain11.example.com use NFS to share the home to your system. This file system contains a pre configured
home directory of user ldapuserX.
Home directory of ldapuserX is:
server.domain11.example.com /home/guests/ldapuser
Home directory of ldapuserX should automatically mount to the ldapuserX of the local /home/guests Home directory’s
write permissions must be available for users ldapuser1’s password is password
Correct Answer: Check the anser in explanation.
yum install -y autofs mkdir /home/rehome
/etc/auto.master /home/rehome/etc/auto.ldap Keep then exit cp /etc/auto.misc /etc/auto.ldap
/etc/auto.ldap ldapuserX -fstype=nfs,rw server.domain11.example.com:/home/guests/ Keep then exit systemctl start
autofs systemctl enable autofs su – ldapuserX// test
If the above solutions cannot create files or the command prompt is -bash-4.2$, it maybe exist multi-level directory, this
needs to change the server.domain11.example.com:/home/guests/ to server.domain11.example.com:/home/guests/
ldapuserX. What is multi-level directory? It means there is a directory of ldapuserX under the /home/guests/ldapuserX in
the questions. This directory is the real directory.

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