Information is transmitted over a communications channel using two signals s2 and s3. The transmittal of s2 requires 2 microseconds, and the transmittal of s3 requires 3 microseconds. A message is a finite sequence of signals, each of which is s2 or s3. Let an denote the number of different messages that can be sent in exactly n microseconds. (a) Find a recurrence relation for an.

What is domain name system (dns)? allows dynamic ip address allocation so users do not have to have a preconfigured ip address to use the network converts ip addresses into domains, or identifying labels that use a variety of recognizable naming conventions the efficient coexistence of telephone, video, and data communication within a single network, offering convenience and flexibility not possible with separate infrastructures the integration of communication channels into a single service