Red Hat EX200 Online Practice Questions and Exam Preparation

Red Hat EX200 Online Questions & Answers

• Question 121:

  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.
  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 122:

  Make a swap partition having 100MB. Make Automatically Usable at System Boot Time.

  Correct Answer. Check the anser in explanation.
  Check the anser in explanation.

  ---

  1.

  Use fdisk /dev/hda ->To create new partition.

  2.

  Type n-> For New partition

  3.

  It will ask for Logical or Primary Partitions. Press l for logical.

  4.

  It will ask for the Starting Cylinder: Use the Default by pressing Enter Key.

  5.

  Type the Size: +100M ->You can Specify either Last cylinder of Size here.

  6.

  Press P to verify the partitions lists and remember the partitions name. Default System ID is 83 that

  7.

  means Linux Native.

  8.

  Type t to change the System ID of partition.

  9.

  Type Partition Number

  10.Type 82 that means Linux Swap.

  11.Press w to write on partitions table.

  12.Either Reboot or use partprobe command.

  13.mkswap /dev/hda? ->To create Swap File system on partition.

  14.swapon /dev/hda? ->To enable the Swap space from partition.

  15.free -m ->Verify Either Swap is enabled or not.

  16.vi /etc/fstab/dev/hda? swap swap defaults 0 0

  17.Reboot the System and verify that swap is automatically enabled or not.

• Question 123:

  Configure a task: plan to run echo hello command at 14:23 every day.

  Correct Answer. Check the anser in explanation.
  Check the anser in explanation.

  ---

  # which echo # crontab -e 23 14 * * * /bin/echo hello # crontab -l (Verify)

• Question 124:

  Add a swap partition.

  Adding an extra 500M swap partition to your system, this swap partition should mount automatically when the system starts up. Don't remove and modify the existing swap partitions on your system.

  Correct Answer. Check the anser in explanation.
  Check the anser in explanation.

  ---

  fdisk -cu /dev/vda// in the way of expanding the partition, don't make main partition partx –a /dev/vda mkswap /dev/vdax swapon /dev/vdax swapon –s vi /etc/fstab /dev/vdaxswapswapdefaults0 0 mount -a

• Question 125:

  Part 2 (on Node2 Server)

  Task 7 [Implementing Advanced Storage Features]

  Create a thin-provisioned filesystem with the name think_fs from a pool think_pool using the devices.

  The filesystem should be mounted on /strav and must be persistent across reboot

  Correct Answer. Check the anser in explanation.
  Check the anser in explanation.

  ---

  * [root@node2 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT vdd 252:48 0 5G 0 disk vde 252:64 0 10G 0 disk vdo1 253:4 0 50G 0 vdo /vbread [root@node2 ~]# yum install stratis* -y [root@node2 ~]# systemctl enable --now stratisd.service [root@node2 ~]# systemctl start stratisd.service [root@node2 ~]# systemctl status stratisd.service [root@node2 ~]# stratis pool create think_pool /dev/vdd [root@node2 ~]# stratis pool list Name Total Physical Properties think_pool 5 GiB / 37.63 MiB / 4.96 GiB ~Ca,~Cr

  * [root@node2 ~]# stratis filesystem create think_pool think_fs [root@node2 ~]# stratis filesystem list Pool Name Name Used Created Device UUID think_pool think_fs 546 MiB Mar 23 2021 08:21 /stratis/think_pool/think_fs ade6fdaab06449109540c2f3fdb9417d [root@node2 ~]# mkdir /strav [root@node2 ~]# lsblk [root@node2 ~]# blkid /dev/mapper/stratis-1-91ab9faf36a540f49923321ba1c5e40d-thin-fs- ade6fdaab06449109540c2f3fdb9417d: UUID="ade6fdaa-b064-4910-9540-c2f3fdb9417d" BLOCK_SIZE="512" TYPE="xfs"

  * [root@node2 ~]# vim /etc/fstab UUID=ade6fdaa-b064-4910-9540-c2f3fdb9417d /strav xfs defaults,x- systemd.requires=stratisd.service 0 0 [root@node2 ~]# mount /stratis/think_pool/think_fs /strav/ [root@node2 ~]# df -hT /dev/mapper/stratis-1-91ab9faf36a540f49923321ba1c5e40d-thin-fs- ade6fdaab06449109540c2f3fdb9417d xfs 1.0T 7.2G 1017G 1% /strav

• Question 126:

  Part 2 (on Node2 Server)

  Task 4 [Managing Logical Volumes]

  Resize the logical volume, lvrz and reduce filesystem to 4600 MiB. Make sure the the filesystem contents remain intact with mount point /datarz

  (Note: partitions are seldom exactly the size requested, so anything within the range of 4200MiB to 4900MiB is acceptable)

  Correct Answer. Check the anser in explanation.
  Check the anser in explanation.

  ---

  * [root@node2 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT vdb 252:16 0 5G 0 disk vdb1 252:17 0 4.2G 0 part vgrz-lvrz 253:2 0 4.1G 0 lvm /datarz vdc 252:32 0 5G 0 disk vdc1 252:33 0 4.4G 0 part datavg-datalv 253:3 0 3.9G 0 lvm /data vdd 252:48 0 5G 0 disk vde 252:64 0 10G 0 disk [root@node2 ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lvrz vgrz -wi-ao---- 4.10g [root@node2 ~]# vgs VG #PV #LV #SN Attr VSize VFree vgrz 1 1 0 wz--n- <4.15g 48.00m [root@node2 ~]# parted /dev/vdb print Number Start End Size Type File system Flags 1 1049kB 4456MB 4455MB primary lvm

  * [root@node2 ~]# df -hT Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/vgrz-lvrz ext4 4.0G 17M 3.8G 1% /datarz [root@node2 ~]# parted /dev/vdb mkpart primary 4456MiB 5100MiB [root@node2 ~]# parted /dev/vdb set 2 lvm on [root@node2 ~]# udevadm settle [root@node2 ~]# pvcreate /dev/vdb2 Physical volume "/dev/vdb2" successfully created.

  * [root@node2 ~]# vgextend vgrz /dev/vdb2 Volume group "vgrz" successfully extended [root@node2 ~]# lvextend -r -L 4600M /dev/vgrz/lvrz Size of logical volume vgrz/lvrz changed from 4.10 GiB (1050 extents) to 4.49 GiB (1150 extents). Logical volume vgrz/lvrz successfully resized. [root@node2 ~]# resize2fs /dev/vgrz/lvrz [root@node2 ~]# df -hT Filesystem Type Size Used Avail Use% Mounted on /dev/mapper/vgrz-lvrz ext4 4.4G 17M 4.2G 1% /datarz

• Question 127:

  Configure iptables, there are two domains in the network, the address of local domain is 172.24.0.0/16 other domain is 172.25.0.0/16, now refuse domain 172.25.0.0/16 to access the server.

  Correct Answer. Check the anser in explanation.
  Check the anser in explanation.

  ---

  iptables -F service iptables save iptables -A INPUT -s 172.25.0.0/16 -j REJECT service iptables save service iptables restart

• Question 128:

  There are two different networks 192.168.0.0/24 and 192.168.1.0/24. Where 192.168.0.254 and 192.168.1.254 IP Address are assigned on Server. Verify your network settings by pinging 192.168.1.0/24 Network's Host.

  Correct Answer. Check the anser in explanation.
  Check the anser in explanation.

  ---

  vi /etc/sysconfing/network NETWORKING=yes HOSTNAME=station?.example.com GATEWAY=192.168.0.254 service network restart

  2.vi /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 ONBOOT=yes BOOTPROTO=static IPADDR=X.X.X.X NETMASK=X.X.X.X GATEWAY=192.168.0.254 ifdown eth0 ifup eth0

• Question 129:

  Part 1 (on Node1 Server)

  Task 11 [Scheduling Future Tasks]

  The user natasha must configure a cron job that runs daily at 14:23 local time and also the same cron job will run after every 2 minutes and executes:

  /bin/echo hello

  Correct Answer. Check the anser in explanation.
  Check the anser in explanation.

  ---

  *

  [root@node1 ~]# crontab -l -u natasha

  no crontab for natasha

  [root@node1 ~]# crontab -e -u natasha

  23 14 * * * /bin/echo hello

  */2 * * * * /bin/echo 2min

  crontab: installing new crontab

  [root@node1 ~]# crontab -l -u natasha

  23 14 * * * /bin/echo hello

  */2 * * * * /bin/echo 2min

  [root@node1 ~]# systemctl status crond.service

  *

  ### For Checking ###

  [root@node1 ~]# tail -f /var/log/cron

  Mar 23 13:23:48 node1 crontab[10636]: (root) REPLACE (natasha) Mar 23 13:23:48 node1 crontab[10636]: (root) END EDIT (natasha) Mar 23 13:23:50 node1 crontab[10638]: (root) LIST (natasha) Mar 23 13:24:01 node1 crond[1349]: (root)

  FAILED (loading cron table) Mar 23 13:24:02 node1 CROND[10673]: (natasha) CMD (/bin/echo 2min)

• Question 130:

  Locate all the files owned by ira and copy them to the / root/findresults directory.

  Correct Answer. Check the anser in explanation.
  Check the anser in explanation.

  ---

  # find / -user ira > /root/findresults (if /root/findfiles is a file) # mkdir -p /root/findresults # find / -user ira -exec cp -a {} /root/findresults\; [ if /root/findfiles is a directory] ls /root/findresults