track rod end, and no its not "broke" as such.
its gaitor is perished. jack it up, hold the wheel at 3 and 9 oclock and rock it to check for play.
any knocking noise could be, there, drop links, top mounts, broken spring...
the gaitor is there to protect the balljoint and its grease inside. when it splits and allows crap to get in there, they start to go tits up. but before we say, yes that is at fault for the noise, check other things listed above.
easy to repalce, cheap too. just get your Tracking adjusted after.