Q3. (6 points) Refer to the figure below (Figure 1.27 in an older version of textbook). Consider a message that is 7.5106 bits long, and each link has a transmission rate of 1.0Mbps. Keep in mind that all switches use the store-and-forward packet switching mechanism at all times. Ignore propagation, queuing, and processing delays, and assume there is no congestion in the network. Answer the following questions and briefly explain your answers. a) (3 points) How much time is required to move the entire message from source to destination without message segmentation (i.e., message is not broken into smaller packets by the source)? b) (3 points) Now suppose the source breaks the message into 2500 packets of equal size, how much time is required to move the message from source to destination with packet switching