In a typical brute force attack, several machines or bots try to guess the username and password for a site one at a time. In a brute force amplification attack, attackers can guess hundreds or thousands of combinations within a single request making the attack more efficient and difficult to block. Jetpack comes with a module called Jetpack Protect formerly known as BruteProtect, that protect sites from brute force attacks. Sam Hotchkiss, lead developer of Jetpack Protect, confirms in a blog post that Jetpack Protect blocks brute force amplification attacks out-of-the box.
To check the blog post of Sam Hotchkiss of Jetpack Protect, visit here.