Correct Answer: Please see explanation

Explanation:

Solution 1:

Modify file /etc/hosts.allow Add a line: sshd: 172.24.11. Modify file /etc/hosts.deny Add a line: sshd: 172.25.0.

Both of them need to be configured.

Solution 2:

Add a firewall

firewall-cmd –zone=block --add-source=172.25.11.0/24 --permanent firewall-cmd–reload

Both of them need to be configured

Correct Answer: Please see explanation

Explanation:

Correct Answer: Please see explanation

Explanation:

We can change the permission of file/directory either character symbol method or numeric method. Permission: r-Read w-Write x-Execute Permission Category u- Owner User g- Owner Group o- Others Operators + -> Add the Permissions - ->Remove the Permissions = ->Assign the Permissions Numeric Method: 4 -> Read 2 -> Write 1 -> Execute Total: 7, total for owner user, owner group member and for others: 777

1.

chmod u+rwx /data

2.

chmod g+rwx /data

3.

chmod o-rwx /data or chmod 770 /data

4.

Verify the /data: ls -ld /data 5 .You will get drwxrwx---

Correct Answer: Please see explanation

Explanation:

1.

vi /var/schedule30 17 * * * /sbin/dump -0u /dev/st0 /dev/hda7

2.

crontab /var/schedule

3.

service crond restart

We can add the cron schedule either by specifying the scripts path on /etc/crontab file or by creating on text file on crontab pattern. cron helps to schedule on recurring events. Pattern of cron is: Minute Hour Day of Month Month Day of Week Commands 0-59 0-23 1-31 1-12 0-7 where 0 and 7 mean Sunday.

Note * means every. To execute the command on every two minutes */2.

Correct Answer: Please see explanation

Explanation: