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Question 1:

To ensure SELinux open after the boot:

Correct Answer: Check the answer in explanation

Explanation/Reference:

vim /etc/sysconfig/selinux

selinux=enforcing

setenforce 1

getenforce


Question 2:

Open system kernel forwarding packets function:

Correct Answer: Check the answer in explanation

Explanation/Reference:

vim /etc/sysctl.conf

net.ipv4.ip_forward = 1

sysctl ‐w (Effective immediately)

The following commands should executed without sysctl.conf option:

sysctl ‐a |grep net.ipv4

sysctl ‐P net.ipv4.ip_forward = 1

sysctl ‐w


Question 3:

Configure FTP access as follows:

Download from catalog: / var / ftp / pub using anonymous is allowed

Clients within t3gg.com should NOT have access to FTP on your system

Correct Answer: Check the answer in explanation

Explanation/Reference:

yum install ‐y vsftpd

chkconfig vsftpd on

services vsftpd start

Deny: uninstall hosts.deny or use iptables

vim /etc/hosts.deny

vsftpd: 172.25.0.0/16

iptables ‐A INPUT ‐s 172.25.0.0/16 ‐p tcp ‐dport 20:21 ‐j REJECT

services iptables save


Question 4:

Mount /root/cdrom.iso under /opt/data, and take effect automatically at boot‐start

Correct Answer: Check the answer in explanation

Explanation/Reference:

cd /opt/

mkdir data

mount ‐t iso9660 ‐o loop /root/cdrom.iso /opt/data

vim /etc/fstab

/root/cdrom.iso /opt/data iso9660 defaults,loop 0 0


Question 5:

Configure NFS server to share /common directory with domain30.example.com.

Authenticate the clients devices have the access to it as root user.

Correct Answer: Check the answer in explanation

Explanation/Reference:

yum install ‐y nfs

chkconfig nfs on

chkconfig rpcbind on

vim /etc/exports

/common 172.24.30.0/255.255.255.0 (rw,no_root_squash)

showmount ‐e 172.16.30.5

mount ‐t nfs 172.16.30.5:/common /mnt


Question 6:

Configure an email server domian30.example.com, and it requests to send and receive emails from the local server or the user harry can send or receive emails from network. The email of user harry is /var/spool/mail/harry. Please note: the

DNS server has already been MX record.

Correct Answer: Check the answer in explanation

Explanation/Reference:

yum install ‐y postfix

chkconfig postfix on

vim /etc/postfix/main.cf

inet_interfaces = all

mydestination = example.com, domain30.example.com, localhost

mynetworks = 172.16.30.0/24, 127.0.0.1/8

services postfix restart

Test:

netstat ‐tulnp |grep 25

hostname

echo hello |mail ‐s “est”[email protected]

cat /var/spool/mai/harry


Question 7:

Configure Kernel parameters rhelblq=1 and enable /proc/cmdline to verify your Kernel parameters.

Correct Answer: Check the answer in explanation

Explanation/Reference:

Vim /etc/grub.conf

Write the end of the kernel line

To see after restart

cat /proc/cmdline


Question 8:

Configure cron as follow:

Clients tom should NOT have access to cron

Correct Answer: Check the answer in explanation

Explanation/Reference:

useradd tom

vim /etc/cron.deny

tom

Effective immediately save and exit.


Question 9:

Please visit iscsi shared storage, storage server address is 172.24.30.100, ceded 1500M space, formatted with the ext3 file system, mount / mnt / data, and boot automatically mount.

Correct Answer: Check the answer in explanation

Explanation/Reference:

yum install ‐y iscsi*

chkconfig iscsid on

chkconfig iscsi on

iscsiadm ‐m discovery ‐t st ‐p 172.24.30.100:3260

iscsiadm ‐m node ‐T iqn.2011 ‐p 172.24.30.100 ‐|

service iscsi restart

fdisk ‐|

fdisk /dev/sda

partx ‐a /dev/sda

partx ‐a /dev/sda

mkfs.ext3 /dev/sad1

yum ‐y install tree

cd /var/lib/iscsi

tree . view iqn

cd /mnt

mkdir data

blkid /dev/sda1 (View UUID, UUID mount)

vim /etc/fstab

UUID=XXX /mnt/data ext3 default, _netdev 0 0

mount ‐a


Question 10:

Configuring the NFS service that will /mnt /storage directory with read‐only shared to the example.com domain user when the client as the root user will also have access to the root directory permissions to read‐only shared to cracker.org

domain users.

Correct Answer: Check the answer in explanation

Explanation/Reference:

# vim /etc/exports

/mnt/storage *.example.com(ro,sync,no_root_squash)

/mnt/storage *.cracker.org(ro,sync)


Question 11:

Samba configuration requirements are as follows:

1. The Working Group called RHCE

2. Types of user authentication

3. Shared / mnt / storage directory share name for the share

4. The shared directory allows user1 and user2 user has write permissions to other users are read‐only, if you need password are redhat

5. only allows the user to access the shared directory domain example.com

Correct Answer: Check the answer in explanation

Explanation/Reference:

# yum install ‐y samba

# vim /etc/samba/smb.conf

[global]

workgroup = RHCE

security = user

[share]

path = /mnt/storage

write list = user1 user2

hosts allow = .example.com

# ( echo redhat ; echo redhat ) | smbpasswd ‐s ‐a user1

# ( echo redhat ; echo redhat ) | smbpasswd ‐s ‐a user2

# service smb start; chkconfig smb on


Question 12:

Establish vsftp server, so that only allow user1 user access, and cannot jump out of home directories only allow users to upload and download example domain, allowing only example domains can be accessed.

Correct Answer: Check the answer in explanation

Explanation/Reference:

# yum ‐y install vsftpd

# vim /etc/vsftpd/vsftpd.conf

userlist_deny=NO

userlist_file=/etc/vsftpd/vsftpd.user_list

chroot_list_enable=YES

chroot_list_file= /etc/vsftpd/vsftpd.chroot_list

anon_upload_enable=YES

anonymous_enable=YES

# mkdir ‐p /var/ftp/incoming; chmod 777 /var/ftp/incoming

# chcon ‐t public_content_rw_t /var/ftp/incoming

# setsebool ‐P allow_ftpd_anon_write 1

# setsebool ‐P ftp_home_dir 1

# vim /etc/vsftpd/vsftpd.user_list

user1

# vim /etc/vsftpd/vsftpd.chroot_list

user1

# service vsftpd start; chkconfig vsftpd on

# vim /etc/hosts.deny

vsftpd: ALL EXCEPT .example.com


Question 13:

Lab 2

Turn on your kernel to forward packets function.

Correct Answer: Check the answer in explanation

Explanation/Reference:


Question 14:

Lab 5

Configure the SMTP mail server, you can normally receive mail for example.com domain name, host ‐based machine supports mail aliases function, that is sent to the admin e ‐mail sent to natasha.

Correct Answer: Check the answer in explanation

Explanation/Reference:


Question 15:

Lab 10

Boot iso file to automatically mount /boot to /mnt/cdrom.

Correct Answer: Check the answer in explanation

Explanation/Reference: