The Young Socceroos have claimed a spot at next year's under-19 Asian Championship in Indonesia, toppling North Korea 4-1 in Vietnam.
Australia had only needed to win the match to reach the Asian tournament, having already beaten Hong Kong 3-0 in the Group J qualifiers.
Coach Ufuk Talay's side got off to a strong start against the North Koreans, with Fabian Monge and Western Sydney's Moudi Najjar each scoring within 30 minutes.
Fellow Wanderer Ramy Najjarine made it 3-0 minutes into the second half.
Having beaten beating Hong Kong 5-1, North Korea ensured Australia didn't get a clean sheet with a 67th minute goal.
However they missed a penalty, leading to Australia's final score by Melbourne Victory's Christian Theoharous.
Talay said his troops laid a foundation early by dominating possession.
"It was a good, solid performance all round," the coach said.
"The players took on the challenge of everything that was thrown at them and came through with a deserved result."
The Northern Mariana Islands were originally the fourth member of Group J but withdrew when the venue was moved from regional Victoria's Shepparton to Hanoi, which meant extra costs for participating member associations.
The change to the neutral location was made after the Australian government refused to grant visas to the visiting North Koreans.
The AFC under-19 championships will be held next year between October 18 and November 4.