In packet$-$switched networks, the source host partitions long application$-$layer messages into smaller segments and sends them into the network. The receiver then reassembles the segments back into the original messages. We refer to this process as message segmentation and reassembly. Consider a message of $8*10^6$ bits that is to be sent from source to destination passing through two packet switches. Suppose each link of the routers is $2$ Mbps$.$ At this low transmission rate, transmission delay dominates other delay components. We can ignore propagation, queuing, and processing delays.

Discuss the drawbacks of message segmentation.