cit-45 final exam study guide a differential backup covers what data on a system? a network tap serves what purpose on a network? a subnet of 255.255.248.0 can be represented by what cidr notation? a virus that remains dormant until a specific condition is met, such as the changing of a file or a match of the current date. amazon and rackspace both utilize what virtualization software below to create their cloud environments? an interface that manages traffic from multiple vlans at the transport layer of the osi, what is used to find and communicate with a particular application running on a host?