Resources
Free, no account, no email.
Study tools we would want ourselves. Use them whether or not you ever buy a course.
Objective checklists
Every objective in the current exam, as a list you can tick off. Ticks are saved in this browser only. Print it, or use it to find your gaps before you buy anything.
Subnetting drill
Network+ objective 1.7, and half of real-world troubleshooting. A random address and prefix; you give the network address, broadcast address, and usable host count. Do it by hand until it is boring.