Despite a dominant first period, a Devils push in the second had the teams mired in a one-goal game entering the third, with the Islanders holding a 2-1 lead.
Instead of sitting back and grinding out a defensive third, the Islanders continued to attack - hitting two posts in the opening minutes - before their power play laid down the hammer.
The Islanders scored on back-to-back power plays, extending their lead to 4-1, effectively icing the game. Eberle scored on the first power play, off a Dobson rebound off the end wall at 1:56. Dobson's assist was his second of the night, marking his first-career two-point game, while Barzal picked up his third point of the night on the sequence.
Dobson, who finished the game with 2:56 PP/TOI - tied with Ryan Pulock for the most among d-men - earned praise from his teammates for his work on the PP unit and for a solid game. Dobson finished the night with two assists, six shot attempts and seven blocked shots.
"He's a great skater, he's got good vision, he's got a great skill set too," Eberle said of Dobson. "With Noah, you're going to see him just continue to get better and better. He was here last year, but he's filling into a role this year where he's in ever night. He's getting a lot of opportunities. As his confidence grows and as he continues to play more he's just going to get better and better."
New York followed up with a second power-play goal just 3:20 later. Brock Nelson, who was sporting a large cut on the right side of his face after colliding with PK Subban's knee and getting stitches, deflected a Nick Leddy shot in the high slot past Wedgewood at 5:16.
The Islanders power play finished two-for-three on the evening, while the penalty kill was a perfect one-for-one, upping the Islanders season total to 17-for-18.