We adopted this convention at QMW, and extended it to include departmental
intranet sites (e.g. qm-web.dept.qmw.ac.uk).
One of the management advantages is flexibility: it allows a site originally
hosted on a departmental server to become centrally hosted and vice versa
without changing URLs.
One possible disadvantage is that it increases the number of server
certificates needed to support secure sites, which may have cost
implications.
> Thinking about this some more, departmental URLs of the form
> dept.univ.ac.uk (or www.dept.univ.ac.uk) have additional management
> advantages, as well as being more likely to be indexed (as Danny
> Sullivan described) - for example, it becomes easier to manage a
> departmental robots.txt file.
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