Networking Foundations Protocols and CLI Tools


Course details

As an aspiring IT and networking professional, one of the core responsibilities is troubleshooting network connections: servers, end-user machines, mail services, and websites. This course introduces the main methods for troubleshooting network connectivity issues using different protocols and command-line (CLI) tools. Networking expert Greg Sowell covers HTTP and HTTPS, the protocols that deliver websites; shows how domain names are resolved via DNS; and explains how voice traffic is carried over a network with VoIP. Greg shows how to examine all of these connections and their traffic using CLI tools such as ipconfig, ping, ARP, and Telnet.

Protocols are the lifeblood of modern communication. By the end of this course, you’ll know what you need to troubleshoot any network connection and keep the communication flowing.

Note: This course maps to domain 3 of the MTA Networking Fundamentals exam.


  • Greg Sowell

    Greg Sowell provides networking advice to datacenters, banks, municipalities, ISPs, and even NBA franchises.

    Greg has been routing globally for over a decade. He has worked and consulted for datacenter groups, banking institutions, municipalities, VoIP providers, ISPs, WISPs, MSPs, and even NBA franchises. He studied computer science in college, but the builder in Greg led him to networking. He holds certifications from Cisco in security, VoIP, and routing/switching, including CCIE candidate status. Greg runs his own networking/project blog,, and organizes a regular podcast called TheBrothersWISP, which focuses on the wireless ISP industry. He has also been featured on the cover of the Circuits section of the New York Times and in several other publications, and speaks regularly at networking conferences. A lifelong maker, Greg is obsessed with LEDs and microcontrollers, and enjoys building light suits. A man of many talents, Greg enjoys hacking, and learning anything he can get his hands on.

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