Goals in either half from defender Luke Woolfenden and substitute Kayden Jackson maintained Town's 100 per cent start to the season on their return to the Championship.
Woolfenden rose at the far post to head home in the 23rd minute from a Sam Morsy free-kick, while Jackson converted in the 81st minute following an incisive move involving Wes Burns and Conor Chaplin.
Boss McKenna said: "That was a top performance, no doubt about it.
"I loved the way we stuck to our identity on and off the ball, we were brave in how we played. We played with the intensity, quality, the spirit, the resilience and the threat that we want to have.
"Of course there are areas to improve and we're learning from every game at the moment.
"We learnt an awful lot from Sunderland last week and we'll learn from this one again and look to improve.
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