Please design a network intrusion$-$detection system, give a flowchart and explain your flowchart components and functions. Now Table $2.$ describes some intrusion traffic samples and features, using the CART algorithm to calculate the Gini Index of Diversity $($a measure of impurity$),$ the weighted average Gini Index of splitting $($under specific attribute conditions$),$ the reduction in impurity, and decide which attribute would be chosen for the splitting subset