Cian Kingston’s 30th-minute header had the Rams ahead at Stradbrook and Robert Lehane added shortly after the restart.
Although Ben Hanrahan halved the deficit 25 minutes from the end, Cabo failed to muster an equaliser and Cobh head to Waterford United on Monday with plenty of confidence.
Limerick’s faultless record start to the season continued as they racked up a sixth straight victory by thumping Drogheda United In what was a top-of-the-table clash, Lims demonstrated the gulf in class by killing the game with 20 minutes left.
Drogs were livid about the opener on 33 minutes as Aaron Greene’s handball was missed just moments before Paul O’Conor went up the other end and scored off the rebound from his own shot.
Veteran John O’Flynn doubled the lead on 57 minutes by sweeping home Stephen Kenny’s right-wing cross and Lee-Jay Lynch rifled in the third with a crisp strike 11 minutes later.
Waterford United threw away a three goal lead to draw against Athlone Town 3-3. Anthony McAlavey bagged a brace, sandwiched in between by Darren Murphy’s goal, to put the Blues in commanding positon by the 36th minute.
David Cassidy pulled one back before the break, a springboard for Town to score again through Conor Barry and Daniel Purdy’s equaliser 12 minutes from the end.
Elsewhere, UCD had Maxim Kouogun to thank for both goals of their 2-2 triumph at Shelbourne. Gary O’Neill’s corner allowed “Maxi” supply the opener with is head on 14 minutes but former Student Jamie Doyle brought the Reds level with a lethal 34th-minute strike.
Two minutes after the break, however, up came centre-back Kouogun to nod in another goal, his fourth of the season, to score what proved to be the winner.