Looking to boost your knowledge of Linux networking and abilities as a system administrator? This course, LFCE: Advanced Linux Networking, teaches Linux networking topics that will take your sysadmin skills to the next level. First, you will learn network topologies and the OSI Model.

Next, you'll learn how data moves through networks with Internet Protocol, including addressing, subnetting, ARP, DNS and routing packets. Then, you'll learn how to get data to its destination reliably with TCP internals. Finally, you'll learn to troubleshoot network connectivity issues. When you're finished with this course, you will have the skills and knowledge of Linux networking needed for design and troubleshooting.

https://www.pluralsight.com/courses/linux-networking-advanced-lfce