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Very Useful RedHat EX200 Question Answers (q1-q13) Online Practice Test
QUESTION 1
Create a backup
Create a backup file named /root/backup.tar.bz2, contains the content of /usr/local, tar must use bzip2 to compress.
Correct Answer: Check the anser in explanation.
cd /usr/local tar –jcvf /root/backup.tar.bz2
mkdir /test tar –jxvf /root/backup.tar.bz2 –C /test// Decompression to check the content is the same as the /usr/loca after
If the questions require to use gzip to compress. change –j to –z.
QUESTION 2
Copy /etc/fstab to /var/tmp name admin, the user1 could read, write and modify it, while user2 without any permission.
Correct Answer: Check the anser in explanation.
# cp /etc/fstab /var/tmp/ # chgrp admin /var/tmp/fstab # setfacl -m u:user1:rwx /var/tmp/fstab # setfacl -m u:user2:—
/var/tmp/fstab # ls -l -rw-rw-r–+ 1 root admin 685 Nov 10 15:29 /var/tmp/fstab
QUESTION 3
Configure a default software repository for your system.
One
YUM has already provided to configure your system on http://server.domain11.example.com/pub/x86_64/Server, and
can be used normally.
Correct Answer: Check the anser in explanation.
Yum-config-manager –add-repo=http://content.example.com/rhel7.0/x86-64/dvd” is to generate a file vim
content.example.com_rhel7.0_x86_64_dvd.repo, Add a line gpgcheck=0 Yumcleanall Yumrepolist Almost 4305
packages are right, Wrong Yum Configuration will lead to some following questions cannot be worked out.
QUESTION 4
Find all lines in the file /usr/share/dict/words that contain the string seismic. Put a copy of all these lines in their original
order in the file /root/wordlist. /root/wordlist should contain no empty lines and all lines must be exact copies of the
original lines in /usr/share/dict/words.
Correct Answer: Check the anser in explanation.
grep seismic /usr/share/dict/words> /root/wordlist
QUESTION 5
Who ever creates the files/directories on a data group owner should automatically be in the same group owner as data.
Correct Answer: Check the anser in 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 6
Install a FTP server, and request to anonymous download from /var/ftp/pub catalog. (it needs you to configure yum
direct to the already existing file server.)
Correct Answer: Check the anser in explanation.
# cd /etc/yum.repos.d # vim local.repo [local] name=local.repo baseurl=file:///mnt enabled=1 gpgcheck=0 # yum
makecache # yum install -y vsftpd # service vsftpd restart # chkconfig vsftpd on # chkconfig –list vsftpd # vim
/etc/vsftpd/vsftpd.conf anonymous_enable=YES
QUESTION 7
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.
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 8
Make on /archive directory that only the user owner and group owner member can fully access.
Correct Answer: Check the anser in explanation.
chmod 770 /archive
Verify using : ls -ld /archive Preview should be like: drwxrwx— 2 root sysuser 4096 Mar 16 18:08 /archive To change the
permission on directory we use the chmod command. According to the question that only the owner user (root) and
group member (sysuser) can fully access the directory so: chmod 770 /archive
QUESTION 9
Create the user named eric and deny to interactive login.
Correct Answer: Check the anser in explanation.
useradd eric
passwd eric
vi /etc/passwd
eric:x:505:505::/home/eric:/sbin/nologin
Which shell or program should start at login time is specified in /etc/passwd file? By default, Redhat Enterprise Linux
assigns the /bin/bash shell to the users. To deny the interactive login, you should write /sbin/nologin or /bin/ false
instead of login shell.
QUESTION 10
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 11
User mary must configure a task.
Requirement: The local time at 14:23 every day echo “Hello World.”.
Correct Answer: Check the anser in explanation.
crontab -u mary -e
23 14 * * * echo “Hello World.”
QUESTION 12
The firewall must be open.
Correct Answer: Check the anser in explanation.
/etc/init.d/iptables start iptables -F iptables -X iptables -Z /etc/init.d/iptables save chkconfig iptables on
QUESTION 13
Configure the permissions of /var/tmp/fstab
Copy the file /etc/fstab to /var/tmp/fstab. Configure the permissions of /var/tmp/fstab so that:
the file /var/tmp/fstab is owned by the root user.
the file /var/tmp/fstab belongs to the group root.
the file /var/tmp/fstab should not be executable by anyone.
the user natasha is able to read and write /var/tmp/fstab.
the user harry can neither write nor read /var/tmp/fstab.
all other users (current or future) have the ability to read /var/tmp/fstab.
Correct Answer: Check the anser in explanation.
cp -a /etc/fstab /var/tmp
cd /var/tmp
ls -l
getfacl /var/tmp/fstab
chmod ugo-x /var/tmp/fstab
[ No need to do this, there won\\’t be execute permission for the file by default]
# setfacl -m u:natasha:rw /var/tmp/fstab # setfacl -m u:harry:0 /var/tmp/fstab(zero)
[Read permission will be there for all the users, by default. Check it using ls -l /var/tmp/fstab] Verify by [ ls -la
/var/tmp/fstab]
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