Our company link has been down twice over the last 48 hours for a total of about 5 -- all during business hours.

A couple of staff were mildly annoyed that they couldn't access the odd goverment website to enter or retrieve a small amount of info, but otherwise the staff -- doing their work on our local database -- noticed less than the students upstairs sending emails to their friends (or whatever).

Since it often takes less time for experts at a decent ISP to reconfigure a few firewall/proxy/filter things to block a DDOS than it does for any given staff member to actually notice that "The Internet Is Down" I think we can probably cope with any sort of "cyber attack".