An experienced Blues side started the game, and they found themselves a goal to the good after a Sunderland player put through his own net with less than 15 minutes gone.
It soon became 2-0 as Reece Brown's great through-pass found Andy Shinnie and the Scot finished with aplomb as he chipped the ball over the advancing Sunderland keeper and into the roof of the net.
The moment of the match arrived after the break as Dudka (pictured) scored a "world-class" goal to put Blues in a commanding position. The ball fell to the Pole just outside the box and he let fly with a terrific half-volley which flew straight into the back of the net.
However, the complexion of the game changed for Blues when development squad boss Richard Beale made four changes to his side. This inevitably caused some disruption to the flow and tempo, and resulted in Sunderland scoring twice.
Beale was extremely happy with the way his players applied themselves and felt the match provided a decent test.
"All the first team players that played applied themselves very well and worked really hard and we played some really nice football," he said.
"We started really well and were 2-0 up at half-time, although it could have been more as we missed a few other good chances.
"Dariusz Dudka then scored with a world-class strike. He showed fantastic technique and played well throughout the game and is getting fitter all the time.
"After I made four changes it unsettled us a little bit and we were a bit sloppy for the last half hour and we conceded two goals, but we managed to see the game out.
"Sunderland were a fairly young side and in the second half it was more of an even game age-wise and they put us under some good pressure, so it was a good test."
Townsend, Elliott (Truslove, 55), Mullins (Adams, 55), Lee (McDonald, 55), Moseley, Dudka, Brown, Shinnie (Webb, 55), Lovenkrands, A Trialist, Gray.