RHCE: EX300 Exam Free Download

The best fully integrated study system available (Exams EX200 and EX300)
With hundreds of review questions and complete coverage of performance-based requirements, RHCSA/RHCERed Hat Linux Certification Study Guide, Sixth Edition covers what you need to know–and shows you how to prepare–for these challenging exams.
100% complete coverage of all official objectives for Exams EX200 and EX300
Exam Readiness Checklist–you’re ready for the exam when all objectives on the list are checked off Inside the Exam sections in every chapter highlight key exam topics covered Two-Minute Drills for quick review 100+ lab questions–two full lab-based RHCSA exams and two full lab-based RHCE exams–match the format, tone, topics, and difficulty of the real exam
Covers all the exam topics:
* Fundamental Command Line Skills
* RHCSA-Level Security Options
* The Boot Process
* Linux Filesystem Administration
* Package Management
* User Administration
* RHCSA-Level System Administration
* RHCE Security
* System Services and SELinux
* RHCE Administration
* Mail Servers
* Samba
* File Sharing
* DNS, FTP, and Logging


Question

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
Answer:
    # yum install –y postfix
# service postfix restart
    # 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 “test”root@example.com
# cat /var/spool/mai/harry

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