Chapter 1, Problem P28P

a.

Explanation of Solution

The formula used for calculating the time required for sending the required files continuously is as follows

${\text{t}}_{\text{trans}}\text{+}{\text{t}}_{\text{prop}}$

Substitute “400” for is “${\text{t}}_{\text{trans}}$

b.

Explanation of Solution

The formula used for calculating the time required for sending the required files continuously is as follows

$\text{N}\times {\text{(t}}_{\text{trans}}\text{+}{\text{t}}_{\text{prop}})$

The file is divided into two sections with 20 packets each and each section has its own propagation delay. Hence, the total propagation delay is ${\text{2t}}_{\text{prop}}$

Substitute “20” for “N”, “20” for “<

c.

Explanation of Solution

By comparing both the situations it is concluded that, division of the file requires more time to transmit the packets...