Professor Messer’s CompTIA 220-801 and 220-802 A+ Training Course

Take my CompTIA A+ training videos and MP3s with you!

Professor Messer’s N10-005 Network+ Certification Training Course

Download my videos, PDF slides, and MP3 audio!

Professor Messer’s CompTIA SY0-301 Security+ Training

Download my Security+ training right now!

Professor Messer’s Microsoft 70-680 Windows 7 Training

Get your 70-680 Microsoft Windows 7 certification!


  • Other Recent Articles

  • That’s too much impact

    That’s too much impact

    Which of these is a common characteristic of an impact printer?

  • Network Access Control – CompTIA Security+ SY0-401: 1.3

    Network Access Control – CompTIA Security+ SY0-401: 1.3

    An open network jack in a conference room can provide a malicious user with complete access to the internal network. In this video, you’ll learn how network access control (NAC) can be used to help secure network connections.

  • Telephony – CompTIA Security+ SY0-401: 1.3

    Telephony – CompTIA Security+ SY0-401: 1.3

    VoIP and telephony technologies are now integrated into almost all of our networks. In this video, you’ll learn what security concerns exist for telephony-related technologies.

  • Network Address Translation – CompTIA Security+ SY0-401: 1.3

    Network Address Translation – CompTIA Security+ SY0-401: 1.3

    Nearly every Internet-connected organization uses some type of network address translation. In this video, you’ll learn how destination NAT and source NAT is used to provide Internet connectivity and to protect your internal servers from users on the Internet.

  • VLANs – CompTIA Security+ SY0-401: 1.3

    VLANs – CompTIA Security+ SY0-401: 1.3

    Nearly every network requires the administration of virtual LANs, or VLANs. In this video, you’ll learn about VLANs and how they can be used to logically segment and secure your network.

  • Subnetting the Network – CompTIA Security+ SY0-401: 1.3

    Subnetting the Network – CompTIA Security+ SY0-401: 1.3

    One of the key concepts of TCP/IP networks is subnetting. In this video, you’ll learn why we subnet our networks and you’ll see a network design that incorporates separate IP subnets.

  • DMZ – CompTIA Security+ SY0-401: 1.3

    DMZ – CompTIA Security+ SY0-401: 1.3

    A common network design is to include a virtual DMZ (demilitarized zone) to separate the Internet from the inside of the network. In this video, you’ll learn how a DMZ is used as a layer of protection and which devices you would commonly find in a DMZ.

  • All Recent Articles