Which function enforces logical data throughput rates that are below the actual physical line rate of a port?()A.rate limitingB.data policingC.classificationD.bandwidth limiting

Asynchronous Transfer Mode(ATM)is a(16)that promises to change the fabric of local and wide area communications.The key advantage of ATM is the capability to move voice, data, graphics and(17)at speeds of up to 2 gigabits per second.An ATM switch allows you to create a(18)network that is completely independent from the(19)configuration of the network.ATM uses a(20)called cell switching to convert data into fixed length cells of 53 bytes each, so they can be switched very quickly and efficiently.

A．technology

B．video images

C．logical

D．physical

阅读以下说明和Java程序，将应填入(n)处的字句写在对应栏内。

[说明]

下面程序输出一个矩形面积，以及矩形区域上的假想的作物产量。

[Java程序]

public class MainJava {

public static void main(String[] args){

Lot_size small=new Lot_size();

Lot_size medium=new Lot_size();

small.set(5,5,5，25);

medium.set(10,10,10,50);

System.out.println("For a small lot of area"

+small.get_area()+"\n");

System.out.println("the actual crops are $"

+small.get_data2()+"\n");

System.out.println("and ideal crops are $"

+small.get data()+"\n");

System.out.println("For a medium lot of area"

+medium.get_area()+“\n”)；

System.out.println("the actual crops are $"

+medium.get_data2()+"\n");

System.out.println ("and ideal crops are $"

+medium.get_data()+"\n");

}

}

class Crop_assessment{

private int actual_crop;

private int ideal_crop;

public void set(int in_actual,int in ideal){

actual_crop=in_actual;

ideal_crop=in_ideal;

}

public int get_actual_crop(){return (1) ;}

public int get_ideal_crop()(return (2) ;}

}

class Lot_size{

private int length;

private int width;

private Crop_assessment crop= (3) ;

public void set(int 1,int W,int a,int i){

length=1;

width=W;

crop.set(a,i);

}

public int get_area(){return length*width;}

public int get_data()freturn (4) ;}

public int get_data2()(return (5) ;}

}

A.__FILE__

B.__ROOT__

C.__LINE__

D.__FUNCTION__