RedHat RHCE certification EX300 Questions & Answers

• Question 21:

  SIMULATION

  There were two systems:

  system1, main system on which most of the configuration take place

  system2, some configuration here

  Configure port forwarding.

  Configure server X to forward traffic incoming on port 80/tcp from source network

  172.25.X.0/255.255.255.0 to port on 5243/tcp.

  Correct Answer: Please see explanation

  Explanation:

  

• Question 22:

  SIMULATION

  There are Mail servers, Web Servers, DNS Servers and Log Server. Log Server is already configured. You should configure the mail server, web server and dns server to send the logs to log server.

  Correct Answer: Please see explanation

  Explanation:

  According to question, log server is already configured. We have to configure the mail, web and dns server

  for log redirection. In mail, web and dns server:

  1.

  vi /etc/syslog.conf mail.* @logserveraddress

  2.

  service syslog restart

  mail is the facility and * means the priority. It sends logs of mail services into log server.

• Question 23:

  SIMULATION

  Add a cron schedule to take full backup of /home on every day at 5:30 pm to /dev/st0 device.

  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.

• Question 24:

  SIMULATION

  There were two systems:

  system1, main system on which most of the configuration take place

  system2, some configuration here

  Configure selinux.

  Configure your systems that should be running in Enforcing.

  Correct Answer: Please see explanation

  Explanation:

  

  After reboot and verify with this command

• Question 25:

  SIMULATION

  Install the Cron Schedule for jeff user to display "Hello" on daily 5:30.

  Correct Answer: Please see explanation

  Explanation:

  1.

  Login as a root user

  2.

  cat >schedule.txt 30 05 * * * /bin/echo "Hello"

  3.

  crontab -u jeff schedule.txt

  4.

  service crond restart

  The cron system is essentially a smart alarm clock. When the alarm sounds, Linux runs the commands of your choice automatically. You can set the alarm clock to run at all sorts of regular time intervals. Alternatively, the system allows you to run the command of your choice once, at a specified time in the future. Red Hat configured the cron daemon, crond. By default, it checks a series of directories for jobs to run, every minute of every hour of every day. The crond checks the /var/spool/cron directory for jobs by user. It also checks for scheduled jobs for the computer under /etc/crontab and in the /etc/cron.d directory. Here is the format of a line in crontab. Each of these columns is explained in more detail: #minute, hour, day of month, month, day of week, command * * * * * command Entries in a crontab Command Line Field Value Minute 0-59 Hour Based on a 24-hour clock; for example, 23 = 11 p.m. Day of month 1-31 Month 1-12, or jan, feb, mar, etc. Day of week 0-7; where 0 and 7 are both Sunday; or sun, mon, tue, etc. Command: The command you want to run

• Question 26:

  SIMULATION

  Give Full Permission to owner user and owner group member but no permission to others on /data.

  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---

• Question 27:

  SIMULATION

  Whoever creates the file on /data make automatically owner group should be the group owner of /data directory.

  Correct Answer: Please see explanation

  Explanation:

  When user creates the file/directory, user owner will be user itself and group owner will be the primary

  group of the user.

  There is one Special Permission SGID, when you set the SGID bit on directory. When users create the file/

  directory automatically owner group will be same as a parent.

  1.

  chmod g+s /data

  2.

  Verify using: ls -ld /data You will get: drwxrws---

• Question 28:

  SIMULATION

  One Package named zsh is dump on ftp://server1.example.com under pub directory. Install the package from ftp server.

  Correct Answer: Please see explanation

  Explanation:

  1.

  rpm -ivh ftp://server1.example.com/pub/zsh-*

  2.

  Package will install

  rpm command is used to install, update and remove the package, -i means install, -v means verbose and h means display the hash mark.

• Question 29:

  SIMULATION

  Whoever creates the files/directories on /storage group owner should be automatically should be the same group owner of /storage.

  Correct Answer: Please see explanation

  Explanation:

  1.

  chmod g+s /storage

  2.

  Verify using: ls -ld /storage

  Note:

  Permission should be like: drwxrws--- 2 root sysusers 4096 Mar 16 18:08 /storage 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 30:

  SIMULATION

  Make on /storage directory that only the user owner and group owner member can fully access.

  Correct Answer: Please see explanation

  Explanation:

  1.

  chmod 770 /storage

  2.

  Verify using : ls -ld /storage

  Note:

  Preview should be like: drwxrwx--- 2 root sysusers 4096 Mar 16 18:08 /storage To change the permission on directory we use the chmod command. According to the question that only the owner user (root) and group member (sysusers) can fully access the directory so: chmod 770 /archive