LFCE Prep Course: Test Your Knowledge (Part 6)

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    Welcome to part 6 of our Linux Foundation Certified Engineer Training Course sneak peek blog. This is the last blog in this series, and today we will test our knowledge with quizzes and exercises. The answers are at the bottom.

    In parts 1 and 2, we reviewed the OSI network layers. Part 3 covered basic network topologies: local area networks (LANs), wide area networks (WANs), virtual local area networks (VLANs), and bridged networks. In part 4, we covered the different types of DNS servers and reviewed command-line tools. And, in part 5, we reviewed starting and stopping services using init, upstart, and systemd.

    Quizzes

    1. Choose the correct answer (True or False).

    “Well-known” network ports may be manipulated by a regular user.

    True
    False

    2. Choose the correct answer (Multiple Choice).

    The device that connects two different Layer 3 domains is commonly called a:

    Switch
    Router
    V-LAN
    SAN

    3. Choose the correct answer (Multiple Choice).

    What is the name of the most common system initialization subsystem?

    SysV init
    Upstart
    Systemd
    rc.local

    4. Choose the correct answer (True or False).

    The xinetd service is utilized for frequently used services.

    True
    False

    Exercises

    Exercise 1: Installing packages

    Install the vsftp server and ftp client packages. The server package name is usually vsftpd, and either ftp or tnftp client packages are consistent with the solutions.

    • On OpenSUSE systems use zypper
    • On Ubuntu systems use apt-get
    • On CentOS systems use yum

    Exercise 2: Starting a system service manually

    Start the vsftpd daemon manually, and verify it is running.

    Exercise 3: Optional Starting a system service with the SYSV init script if they exist on your system.

    Start the vsftpd daemon using the SYSV init script, and verify that it is running. Systems using systemd or upstart may not have SYSV scripts.

    Answers

    1. Correct answer: False
    2. Correct answer: Router
    3. Correct answer: Systemd
    4. Correct answer: False

    Solution to Exercise 1

    OpenSUSE:

    # zypper install vsftpd tnftp

    Ubuntu

    # apt-get install vsftpd ftp

    CentOS:

    # yum install vsftpd ftp

    Solution to Exercise 2

    Start the daemon manually:

    CentOS:

    # /usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf &

    Ubuntu or OpenSUSE:

    # /usr/sbin/vsftpd /etc/vsftpd.conf &

    Verify it is running:

    # ps -ef | grep vsftpd

    Use the service:

    $ ftp localhost

    Stop the daemon:

    # killall vsftpd

    Solution to Exercise 3

    Start the daemon using the SYSV init script:

    # /etc/init.d/vsftpd start

    Verify it is running:

    # ps -ef | grep vsftpd

    Use the service

    $ ftp localhost

    Stop the daemon

    # /etc/init.d/vsftpd stop

    Learning Objectives (Review)

    You should now be able to:

    • Start and stop system services.
    • Explore the Domain Name Service (DNS) operation.
    • Outline various network topologies.
    • Explain the OSI Model.

    The Linux Foundation offers both certification tests and training, which you can read all about at Linux Foundation Training. You can become a Linux Foundation Certified Sysadmin, or a Linux Foundation Certified Engineer. This six-part series gives you an inside look at our new Linux Foundation Certified Engineer prep course. The full LFCE course has 12 chapters.

    Download the full sample chapter: Linux Networking Concepts and Review.