CompTIA A+ is the best class to start with if you are looking to begin a career in IT. A+ provides a fundamental knowledge that is necessary to move up or advance in the field.
This is a self-paced introductory course on computer networking, specifically the Internet. It focuses on explaining how the Internet works, ranging from how bits are modulated on wires and in wireless to application-level protocols like BitTorrent and HTTP.
It also explains the principles of how to design networks and network protocols. Students gain experience reading and understanding RFCs (Internet protocol specifications) as statements of what a system should do. The course grounds many of the concepts in current practice and recent developments, such as net neutrality and DNS security.
Computer Networking: A Top-Down Approach (6th Edition)