滑动窗口+滚动预测_C和C ++中的滑动窗口协议程序

谁践踏了优雅 2022-12-07 13:58 369阅读 0赞

![df7a9e435882ae1b4889fd81e7e9e546.png][]

滑动窗口+滚动预测

Here you will get sliding window protocol program in C.

在这里，您将获得使用C的滑动窗口协议程序。

In computer networks sliding window protocol is a method to transmit data on a network. Sliding window protocol is applied on the Data Link Layer of OSI model. At data link layer data is in the form of frames. In Networking, Window simply means a buffer which has data frames that needs to be transmitted.

在计算机网络中，滑动窗口协议是一种在网络上传输数据的方法。 滑动窗口协议应用于OSI模型的数据链路层。 在数据链路层，数据采用帧的形式。 在联网中，窗口仅表示具有需要传输的数据帧的缓冲区。

Both sender and receiver agrees on some window size. If window size=w then after sending w frames sender waits for the acknowledgement (ack) of the first frame.

发送方和接收方都同意某些窗口大小。 如果窗口大小= w，则在发送w帧后，发送方将等待第一帧的确认(ack)。

As soon as sender receives the acknowledgement of a frame it is replaced by the next frames to be transmitted by the sender. If receiver sends a collective or cumulative acknowledgement to sender then it understands that more than one frames are properly received, for eg:- if ack of frame 3 is received it understands that frame 1 and frame 2 are received properly.

发送方一接收到帧的确认，就将其替换为发送方要发送的下一帧。 如果接收方向发送方发送了集体确认或累积确认，那么它将理解已正确接收了多个帧，例如：-如果接收到第3帧的确认，它将理解第1帧和第2帧已正确接收。

![Sliding Window Protocol][]

[Image Source][]

[图片来源][Image Source]

In sliding window protocol the receiver has to have some memory to compensate any loss in transmission or if the frames are received unordered.

在滑动窗口协议中，接收器必须具有一些内存，以补偿传输过程中的任何损失或无序接收帧。

**Efficiency of Sliding Window Protocol**

**滑动窗口协议的效率**

*η = (W\*tx)/(tx\+2tp)*

*η=(W \* t x )/(t x \+ 2t p )*

W = Window Size

W =窗口大小

tx = Transmission time

t x =传输时间

tp = Propagation delay

t p =传播延迟

Sliding window works in full duplex mode

滑动窗口在全双工模式下工作

It is of two types:-

它有两种类型：

**1. Selective Repeat: **Sender transmits only that frame which is erroneous or is lost.

**1.选择性重复：**发送方仅发送错误或丢失的帧。

**2. Go back n: **Sender transmits all frames present in the window that occurs after the error bit including error bit also.

**2.返回n：**发送方发送窗口中存在的所有帧，该帧出现在错误位之后，包括错误位。

## C语言的滑动窗口协议程序 **(**Sliding Window Protocol Program in C**)** ##

Below is the simulation of sliding window protocol in C.

下面是C语言中滑动窗口协议的仿真。

#include<stdio.h>
     
    int main()
    {
        int w,i,f,frames[50];
     
        printf("Enter window size: ");
        scanf("%d",&w);
     
        printf("\nEnter number of frames to transmit: ");
        scanf("%d",&f);
     
        printf("\nEnter %d frames: ",f);
     
        for(i=1;i<=f;i++)
            scanf("%d",&frames[i]);
     
        printf("\nWith sliding window protocol the frames will be sent in the following manner (assuming no corruption of frames)\n\n");
        printf("After sending %d frames at each stage sender waits for acknowledgement sent by the receiver\n\n",w);
     
        for(i=1;i<=f;i++)
        {
            if(i%w==0)
            {
                printf("%d\n",frames[i]);
                printf("Acknowledgement of above frames sent is received by sender\n\n");
            }
            else
                printf("%d ",frames[i]);
        }
     
        if(f%w!=0)
            printf("\nAcknowledgement of above frames sent is received by sender\n");
     
        return 0;
    }

**Output**

**输出量**

*Enter window size: 3*

*输入窗口大小：3*

*Enter number of frames to transmit: 5*

*输入要传输的帧数：5*

*Enter 5 frames: 12 5 89 4 6*

*输入5帧：12 5 89 4 6*

*With sliding window protocol the frames will be sent in the following manner (assuming no corruption of frames)*

*使用滑动窗口协议时，将以以下方式发送帧(假设帧没有损坏)*

*After sending 3 frames at each stage sender waits for acknowledgement sent by the receiver*

*在每个阶段发送3帧后，发送方等待接收方发送的确认*

*12 5 89* *Acknowledgement of above frames sent is received by sender*

*12 5 89* *发送方已收到对以上帧的确认*

*4 6* *Acknowledgement of above frames sent is received by sender*

*4 6* *发送方收到上述帧的确认*

## C ++中的滑动窗口协议程序 **(**Sliding Window Protocol Program in C++**)** ##

Below is the simulation of sliding window protocol in C++.

下面是C ++中滑动窗口协议的仿真。

#include<iostream>
     
    using namespace std;
     
    int main()
    {
        int w,i,f,frames[50];
     
        cout<<"Enter window size: ";
        cin>>w;
     
        cout<<"\nEnter number of frames to transmit: ";
        cin>>f;
     
        cout<<"\nEnter "<<f<<" frames: ";
     
        for(i=1;i<=f;i++)
            cin>>frames[i];
     
        cout<<"\nWith sliding window protocol the frames will be sent in the following manner (assuming no corruption of frames)\n\n";
        cout<<"After sending "<<w<<" frames at each stage sender waits for acknowledgement sent by the receiver\n\n";
     
        for(i=1;i<=f;i++)
        {
            if(i%w==0)
            {
                cout<<frames[i]<<"\n";
                cout<<"Acknowledgement of above frames sent is received by sender\n\n";
            }
            else
                cout<<frames[i]<<" ";
        }
     
        if(f%w!=0)
            cout<<"\nAcknowledgement of above frames sent is received by sender\n";
     
        return 0;
    }

Comment below if you have any queries regarding above program.

如果您对以上程序有任何疑问，请在下面评论。

> 翻译自: [https://www.thecrazyprogrammer.com/2017/05/sliding-window-protocol-program-c.html][https_www.thecrazyprogrammer.com_2017_05_sliding-window-protocol-program-c.html]

滑动窗口+滚动预测

[df7a9e435882ae1b4889fd81e7e9e546.png]: /images/20221123/d8d79ff5f4a74ebdaa7f8253d927d4e5.png
[Sliding Window Protocol]: /images/20221123/7755d618d7df4e678bb0f5a54b11637f.png
[Image Source]: https://www.cse.iitk.ac.in/users/dheeraj/cs425/lec09.html
[https_www.thecrazyprogrammer.com_2017_05_sliding-window-protocol-program-c.html]: https://www.thecrazyprogrammer.com/2017/05/sliding-window-protocol-program-c.html