Can you explain speed and the big one security and how this

Can you explain speed and the big one security and how this affects the work place environment. Also does ebusiness require a large pipe to the Internet or would a local DSL work just as well for independent nursing home. When would you need to address issues that would require you to add more bandwidth to your infrastructure?
…….   QUESTION TITLE :- speed and the big one security and how this affects the work place environment.