Question

In Java or  C++

Develop a simulation program to simulate an 8-port Ethernet switch. The switch initially has no knowledge about the hosts connected to each port. It learns frame addresses and stores-and-forwards the frames. The input text file "in.txt" contains information of the incoming frames, one frame per line. There are 4 pieces of data per line: frame ID, arrival port, frame source address, and frame destination address. The frames arrive at the switch in the order of which they appear in the input file. Destination address "X" indicate a broadcast frame. The output text file "out.txt" has 8 lines. Each line lists all the frames departing from each port, Here is an example:

"in.txt" contains 5 incoming frames:

F1 P2 B--A

F2 P6 D--C

F3 P5 E--B

F4 P7 F--D

F5 P6 D--X

"out.txt" should list the departing frames on each port:

P1: F1 F2 F5

P2: F2 F3 F5

P3: F1 F2 F5

P4: F1 F2 F5

P5: F1 F2 F5

P6: F1 F4

P7: F1 F2 F5

P8: F1 F2 F5

Look carefully at P6 in the example out.txt

Submit:

1. Source code.

2. Screen capture of program execution.

3. out.txt for this input file: in1.txt

F1      P1      A--G
F2      P1      B--H
F3      P1      C--I
F4      P2      D--E
F5      P2      D--F
F6      P7      G--A
F7      P8      H--B
F8      P8      I--C
F9      P4      E--D
F10     P4      F--D
F11     P7      G--X
F12     P1      B--G
F13     P2      D--G
F14     P4      E--G
F15     P8      H--G
F16     P1      A--D
F17     P1      B--E
F18     P1      C--F
F19     P2      D--H
F20     P8      H--I

Answer 1

Ans)

Code to Copy:

#include <stdio.h>

#include<stdbool.h>

int main() {

//Declaration of frameID,arrivalPort,SourceAddress,destination as type of character

char frameID,arrivalPort,SourceAddress,DestinationAddress;

//Declaration of arrivalPortMap as character array

char arrivalPortMap[8];

    //Declaration of content as character array

char content[8][100];

    //Declaration of inputFile ,outputFile as type of file pointer

FILE  inputFile,  outputFile;

//Declaration of i and j as type of integer

int i, j;

//Declaration of isConnected as type of bool

bool isConnected;

//Declaration of k as type of integer and assign 0

int k = 0;

//iterate loop

while(k<8)

{

    arrivalPortMap[k] = '*';

    //assign 1 to content[k][0]

    content[k][0] = '1';

    //increment k by 1

    k = k + 1;

}

//open input file

inputFile = fopen("in.txt", "r");

//iterate loop to read the lines from file

while (fscanf(inputFile, "F%c P%c %c--%c\n", & frameID, & arrivalPort, & SourceAddress, & DestinationAddress) != EOF) {

    if (arrivalPortMap[arrivalPort - '1'] == '*')

      arrivalPortMap[arrivalPort - '1'] = SourceAddress;

    if (DestinationAddress == 'X') {

        //Declaration of j as type of integer

        //and assign 0

        int j = 0;

        //iterate loop

        while(j<8)

        {

            content[j][content[j][0] - '0'] = frameID;

            //increment content[j][0] by 1

            content[j][0] = content[j][0] + 1;

            //increment j by 1

            j = j + 1;

        }

      continue;

    }

    //assign false to isConnected

    isConnected = false;

    //Declaration of m as type of integer

    int m = 0;

    //Iterate loop

    while(m<8)

    {

      if (arrivalPortMap[m] == DestinationAddress) {

        content[m][content[m][0] - '0'] = frameID;

        //increment content[m][0] by 1

        content[m][0] = content[m][0] + 1;

        isConnected = true;

        break;

      }

        //increment m by 1

        m = m + 1;

    }

    //if isConnected   

    if (isConnected)

    {

        continue;

    }

    //Declaration of s as type of integer

    //and assign 0

    int s = 0;

   

    //Iterate loop

    while(s<8)

    {

        if (arrivalPortMap[s] != SourceAddress) {

            content[s][content[s][0] - '0'] = frameID;

           //increment content[s][0] by 1

            content[s][0] = content[s][0] + 1;

        }

        //increment s by 1

        s = s + 1;

    }

}

    //close inputFile

fclose(inputFile);

//open output file

outputFile = fopen("out.txt", "w");

  //Iterate loop

for (i = 0; i < 8; i = i + 1) {

      //write data to file

    fprintf(outputFile, "P%d: ", i + 1);

    //Display statement

    printf("P%d: ", i + 1);

    for (j = 1; j < content[i][0] - '0'; j = j + 1) {

        //Display statement

      printf("F%c ", content[i][j]);

      //write data to file

      fprintf(outputFile, "F%c ", content[i][j]);

    }

      //write data to file

    fprintf(outputFile, "\n");

    //Display statement

    printf("\n");

}

//close output file

fclose(outputFile);

return 0;

}

Input file Image

Sample output

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