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Q51. CORRECT TEXT

You have a directory /local. You want to make available that directory to all the members of example.com and trusted.cracker.org. But directory should available in read and write to all the members of example.com domain and read only to cracker.org domain.

Answer and Explanation:

1. vi /etc/exports

/local *.example.com(rw,sync) trusted.cracker.org(ro,sync)

Check the SELinux Context, should be like this:

-rw-r–r– root root system_u:object_r:exports_t /etc/exports

Use the restorecon -R /etc command to restore the selinux context of the file.

2. service nfs start | restart

3. service portmap start | restart

4. chkconfig nfs on

5. chkconfig portmap on

In Linux to share the data we use the /etc/exports file. Pattern is:

Path client(permission)

Shared Directory Path, Client can be single host or domain name or ip address. Permission should specify without space with client lists in parentheses. NFS is RPC service so portmapper service should restart after starting the nfs service. We can specify multiple clients' list separating by space with different shared option.

Q52. CORRECT TEXT

Create the group named training

Answer and Explanation:

1. groupadd training

To create a group we use the groupadd command.

Verify from: cat /etc/group whether group added or not?

Q53. CORRECT TEXT

One New Kernel is released named kernel-hugemem. Kernel is available on ftp://server1.example.com under pub directory for anonymous. Install the Kernel and make previous new kernel is default to boot System.

Answer and Explanation:

1. rpm -ivh ftp://server1.example.com/pub/kernel-hugemem-*

2. vi /etc/grub.conf

Set the default to new kernel

default=0

Example of /etc/grub.conf

default=0

timeout=5

splashimage=(hd0,0)/grub/splash.xpm.gz

hiddenmenu

title Red Hat Enterprise Linux ES (2.6.9-5.ELhugemem)

root (hd0,0)

kernel /vmlinuz-2.6.9-5.ELhugemem ro root=LABEL=/1 rhgb quiet

initrd /initrd-2.6.9-5.ELhugemem.img

title Red Hat Enterprise Linux ES (2.6.9-5.EL)

root (hd0,0)

kernel /vmlinuz-2.6.9-5.EL ro root=LABEL=/1 rhgb quiet

initrd /initrd-2.6.9-5.EL.img

rpm command is used to install, update and remove the rpm package. -ivh option is install,

verbose, and display the hash mark.

Q54. CORRECT TEXT

Configure to allow the pop3 and imap connection from your domain example.com

and my133t.org domain.

Answer and Explanation:

1. vi /etc/hosts.deny

dovecot:ALL EXCEPT .example.com, .my133t.org

We can secure the services using tcp_wrappers. There are main two files, /etc/hosts.allow and /etc/hosts.deny.

There will be three stage access checking

– Is access explicitly permitted? Means permitted from /etc/hosts.allow?

– Otherwise, Is access explicitly denied? Means denied from /etc/hosts.deny?

– Otherwise, by default permit access if neither condition matched.

To deny the services we can configure /etc/hosts.deny file using ALL and EXCEPT operation.

Pattern of /etc/hosts.allow and /etc/hosts.deny file is:

Demon_list:client_list:options

In Client list can be either domain name or IP address.

Q55. CORRECT TEXT

Create the user named jane and john.

Answer and Explanation:

1. useradd jane

2. useradd john

useradd command is used to create the user. All user's information stores in /etc/passwd and user;s shadow password stores in /etc/shadow.

Q56. CORRECT TEXT

If root sends the mail to jane, mail should be send to /var/spool/mail/jane.

Answer and Explanation:

By default all mails to user will send to user's spool directory. Nothing to do.

Q57. CORRECT TEXT

You have DHCP server, which assigns the IP, gateway and DNS server ip to Clients. There are two DNS servers having MAC address (00:50:FC:98:8D:00, 00:50:FC:98:8C:00), in your LAN, But they always required fixed IP address (192.168.0.254, 192.168.0.253). Configure the DHCP server to assign the fixed IP address to DNS server.

Answer and Explanation:

1. vi /etc/dhcpd.conf

ddns-update-style none;

option routers 192.168.0.1;

option domain-name "example.com";

option domain-name-servers 192.168.0.254;

default-lease-time 21600;

max-lease-time 43200;

subnet 192.168.0.0 netmask 255.255.255.0

{

range 192.168.0.1 192.168.0.254;

host dns1 {

hardware ethernet 00:50:FC:98:8D:00;

fixed-address 192.168.0.254;

}

host dns2 {

hardware ethernet 00:50:FC:98:8C:00;

fixed-address 192.168.0.253;

}

}

/etc/dhcpd.conf file is used to configure the DHCP. Some global options i.e Gateway,

domainname, DNS server specified using option keyword. To assign as static ip from dhcp server,

required the mac address of interface.

2. Check the SELinux Context, should be like this:

-rw-r–r– root root system_u:object_r:dhcp_etc_t /etc/dhcpd.conf

3. Use the restorecon -R /etc command to restore the selinux context of the file.

4. service dhcpd start | restart

Q58. CORRECT TEXT

Create the directory /storage and group owner should be the sysusers group.

Answer and Explanation:

1. chgrp sysusers /storage

2. Verify using ls -ld /storage command. You should get like

drwxr-x— 2 root sysusers 4096 Mar 16 17:59 /storage

chgrp command is used to change the group ownership of particular files or directory.

Another way you can use the chown command.

chown root:sysusers /storage

Q59. CORRECT TEXT

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.

Answer and Explanation:

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

2. Start the nfs service: service nfs start

3. Start the portmap service: service portmap start

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

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

6. Verify either sharing or not: showmount -e localhost

7. Check that default firewall is running on system ? if running flush the iptables using iptables –F and stop the iptables service.

Q60. CORRECT TEXT

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?

Answer and Explanation:

1. echo "1" >/proc/sys/net/ipv4/ip_forward

2. 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.

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