Ian Turner burst through but UCD put the the ball out for a corner.
The college's captain has lead by example, by curling an inch perfect free kick into the top corner of the Cobh goal.
A flick of the head from Kerrigan has given UCD a 2-0 lead.
The College should have doubled their lead when Evan Weir squared the ball a free Colm Whelan. Ahead of the striker was a a converged Cobh back four, who cleared the ball to safety.
Liam Kerrigan, who scored in last visit to St Colman's Park, has put UCD ahead from the tightest of angels.
UCD attempted to break through Eoin Farrell and Liam Kerrigan, and reached the Cobh penalty area. As they tried to play a one two, John Kavanagh broke up the attack.
Walsh laid the balll off for Ian Turner who fired a meek effort at goal, which was cleanly gathered by Lorcan Healy.
Weir's free kick is headed down by Darryl Walsh to an unmarked Luke Boore, who blasted his shot over.
Darryl Walsh did well to get control of the ball up top for the Rams, but a converging UCD defence meant that he could not pull off a shot.
UCD's last visit to Cork ended in a 6-0 defeat of the Ramblers.
UCD have made one change from last weekend's 2-2 draw with Athlone Town. Eoin Farrell has come in for Harry McEvoy.
Cobh are unchanged from last week's 2-1 derby defeat against Cork City at Turner's Cross.
Kick off here at St Coleman's Park on an amazing night on Leeside.
Competition: 2021 League of Ireland First Division
Date: 7 p.m. April 3, 2021
St Colman's Park