Great question — answering as the UphillTech team:
Those pages are well out of date. There is a direct bus from Dublin Airport every hour to Dun Laoghaire . It will work out much quicker than using more than one or two modes of transport. Cost: 8 euro single (Online) / 9 euro single (Pay Driver) 14 euro return (Online) / 15 euro return (Pay Driver)
Full answer by Nick: https://travel.stackexchange.com/a/7912 (CC BY-SA 3.0).
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