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Question 1:

Your System is going to use as a Router for two networks. One Network is 192.168.0.0/24 and Another Network is 192.168.1.0/24. Both network\’s IP address has assigned. How will you forward the packets from one network to another network?

Correct Answer: Check the anser in explanation.

echo “1” >/proc/sys/net/ipv4/ip_forward

vi /etc/sysctl.conf

net.ipv4.ip_forward = 1 If you want to use the Linux System as a Router to make communication between different networks, you need enable the IP forwarding. To enable on running session just set value 1 to /proc/sys/net/ipv4/ip_forward. As well as automatically turn on the IP forwarding features on next boot set on /etc/sysctl.conf file.


Question 2:

Configure autofs to make sure after login successfully, it has the home directory autofs, which is shared as /rhome/ldapuser40 at the ip: 172.24.40.10. and it also requires that, other ldap users can use the home directory normally.

Correct Answer: Check the anser in explanation.

# chkconfig autofs on # cd /etc/ # vim /etc/auto.master /rhome /etc/auto.ldap # cp auto.misc auto.ldap # vim auto.ladp ldapuser40 -rw,soft,intr 172.24.40.10:/rhome/ldapuser40 * -rw,soft,intr 172.16.40.10:/rhome/and # service autofs stop # server autofs start # showmount -e 172.24.40.10 # su – ladpuser40


Question 3:

YUM repository has been provided at http://server.domain11.example.com/pub/x86_64/Server. Configure your system to use this location as a default repository.

Correct Answer: Check the anser in explanation.

vim/etc/yum.repos/base.repo [base] name=base baseurl= http://server.domain11.example.com/pub/x86_64/Server gpgcheck=0 enable=1 Save and Exit Use yum list for validation, the configuration is correct if list the package information. If the Yum configuration is not correct then maybe cannot answer the following questions.


Question 4:

Create a 2G swap partition which take effect automatically at boot-start, and it should not affect the original swap partition.

Correct Answer: Check the anser in explanation.

# fdisk /dev/sda p (check Partition table) n (create new partition: press e to create extended partition, press p to create the main partition, and the extended partition is further divided into logical partitions) Enter 2G t 8 I

W partx -a /dev/sda partprobe mkswap /dev/sda8 Copy UUID swapon -a vim /etc/fstab UUID=XXXXX swap swap defaults 0 0 (swapon -s)


Question 5:

You are a System administrator. Using Log files very easy to monitor the system. Now there are 50 servers running as Mail, Web, Proxy, DNS services etc. You want to centralize the logs from all servers into on LOG Server. How will you configure the LOG Server to accept logs from remote host?

Correct Answer: Check the anser in explanation.

By default, system accept the logs only generated from local host. To accept the Log from other host configure: vi /etc/sysconfig/syslog SYSLOGD_OPTIONS=”-m 0 -r” Where -m 0 disables \’MARK\’ messages. -r enables logging from remote machines -x disables DNS lookups on messages received with -r service syslog restart


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Question 6:

According the following requirements to create user, user group and the group members:

-A group named admin.

A user named mary, and belong to admin as the secondary group.

A user named alice, and belong to admin as the secondary group.

A user named bobby, bobby’s login shell should be non-interactive. Bobby not belong to admin as the secondary group. Mary, Alice, bobby users must be set “password” as the user\’s password.

Correct Answer: Check the anser in explanation.

groupadd admin useradd -G admin mary useradd -G admin alice useradd -s /sbin/nologin bobby echo “password” | passwd –stdin mary echo “password” | passwd –stdin alice echo “password” | passwd –stdin bobby


Question 7:

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.


Question 8:

Some users home directory is shared from your system. Using showmount -e localhost command, the shared directory is not shown. Make access the shared users home directory.

Correct Answer: Check the anser in explanation.

Verify the File whether Shared or not ? : cat /etc/exports

Start the nfs service: service nfs start

Start the portmap service: service portmap start

Make automatically start the nfs service on next reboot: chkconfig nfs on

Make automatically start the portmap service on next reboot: chkconfig portmap on

Verify either sharing or not: showmount -e localhost

Check that default firewall is running on system?

If running flush the iptables using iptables -F and stop the iptables service.


Question 9:

Your System is configured in 192.168.0.0/24 Network and your nameserver is 192.168.0.254. Make successfully resolve to server1.example.com.

Correct Answer: Check the anser in explanation.

nameserver is specified in question,

1.

Vi /etc/resolv.conf nameserver 192.168.0.254

2.

host server1.example.com


Question 10:

Create a Shared Directory.

Create a shared directory /home/admins, make it has the following characteristics:

/home/admins belongs to group adminuser

This directory can be read and written by members of group adminuser Any files created in /home/ admin, group automatically set as adminuser.

Correct Answer: Check the anser in explanation.

mkdir /home/admins chgrp -R adminuser /home/admins chmodg w /home/admins chmodg s /home/admins


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