Arsenal put in another strong display to comfortably see off Bodo/Glimt in the Europa League at the Emirates.
Striker Eddie Nketiah reacted to poke in the opener after Kieran Tierney's powerful effort came back off the post.
Fabio Vieira crossed it in for Rob Holding to head in a second before the Portuguese made it 3-0 late on.
Mikel Arteta's side have won four successive matches in all competitions and top their Europa League group, as well as leading the Premier League.
Arteta later said: "I'm really happy with the win, six points and a clean sheet. But we lacked connection between the players, we lacked consistency and domination through the game.
"There were eight changes, you could feel that, the timing was missing.
"In the final third we looked very dangerous, the goals we scored were good goals."
On early subs in the second half, he added: "A few players, you could see they had a different intensity, not enough exposure in terms of minutes, so we had to make changes."