Early goals from Craig Dawson and Jordan Henderson helped England maintain their 100% record in Euro 2013 qualification with victory in Norway.
West Bromwich Albion defender Dawson headed in from a Henri Lansbury corner in the fourth minute.
Barely two minutes later Ross Barkley squared to Liverpool midfielder Henderson and he slotted home.
Valon Berisha replied for Norway midway through the first half, but Stuart Pearce's youngsters held on.
The result leaves England on nine points, three clear of Norway ahead of next month's double-header against Iceland and Belgium.
Any fears about how England, who handed debuts to Peterborough's Ryan Bennett and Blackburn's Jason Lowe, would adapt to their opponents' synthetic 4G pitch were quickly dispelled when Dawson powered home what is fast becoming a trademark header from Lansbury's corner.
It was the West Brom defender's third goal in just four Under-21 starts and it got better for the visitors when Barkley teed up Henderson to make it 2-0.
But England soon surrendered their advantage and were made to pay in the 23rd minute when Nathan Baker - in for Matthew Briggs who picked up an injury in the warm-up in Drammen - failed to deal with a ball over the top, allowing Berisha to tuck home Markus Henriksen's cross.
Norway should have levelled three minutes before half-time but Frederik Berge could only shoot tamely at Birmingham's Jack Butland.
England withdrew Barkley for Gary Gardner early in the second half but they were unable to re-establish their early dominance.
More substitutions followed for both sides and one of them thought he had set up the equaliser in the 80th minute but Markus Pedersen somehow scuffed Yann Erik De Lanlay's cutback from just six yards.
Lansbury was desperately unlucky not to kill the contest three minutes from time when Alex Oxlade-Chamberlain danced past Stefan Strandberg and stroked the ball across for the West Ham loanee, whose sliding finish smashed against the underside of the crossbar.
There was some last-ditch defending in the closing moments as Norway poured forward but Stuart Pearce's young Lions kept them out.