Airbridge. The gate can sometimes be like musical chairs and switch from B gates where you should go through security to C gates but its only max 5 min walk between the 2 so its not an issue. I've been getting the Thursday evening flight back to DUB last 4 weeks (@20:25) and it is routinely delayed so if you are on that then keep an eye on the arriving flight to know when to bother to go to the gate. They say boarding at 19:45 but the arriving flight only due to land at 19:45 if on time so unless its early you'll have a bit more time.