Pompey avoided slipping on an Emirates FA Cup banana skin to ease into the third round.
Rasmus Nicolaisen opened the scoring in just the second minute of a clash with King's Lynn at Fratton Park.
And Kenny Jackett's side went on to secure a 6-1 victory, with Tom Naylor, Sean Raggett, Marcus Harness, Ellis Harrison and Jordy Hiwula also on target.
The Blues will be ball number 51 when the draw for the next round takes place on Monday evening.