diff --git a/cnlabtest/CN/A3/q2-audio/a.out b/cnlabtest/CN/A3/q2-audio/a.out
new file mode 100644
index 0000000..7999e0d
Binary files /dev/null and b/cnlabtest/CN/A3/q2-audio/a.out differ
diff --git a/cnlabtest/CN/A3/q2-audio/main.c b/cnlabtest/CN/A3/q2-audio/main.c
new file mode 100644
index 0000000..f988571
--- /dev/null
+++ b/cnlabtest/CN/A3/q2-audio/main.c
@@ -0,0 +1,138 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include <time.h>
+#include <portaudio.h>
+#include <sndfile.h>
+
+#define FRAMES_PER_BUFFER 1024
+
+typedef struct
+{
+    uint16_t formatType;
+    uint8_t numberOfChannels;
+    uint32_t sampleRate;
+    size_t size;
+    float *recordedSamples;
+} AudioData;
+
+typedef struct
+{
+    float *snippet;
+    size_t size;
+} AudioSnippet;
+
+AudioData initAudioData(uint32_t sampleRate, uint16_t channels, int type)
+{
+    AudioData data;
+    data.formatType = type;
+    data.numberOfChannels = channels;
+    data.sampleRate = sampleRate;
+    data.size = 0;
+    data.recordedSamples = NULL;
+    return data;
+}
+
+float avg(float *data, size_t length)
+{
+    float sum = 0;
+    for (size_t i = 0; i < length; i++)
+    {
+        sum += fabs(*(data + i));
+    }
+    return (float) sum / length;
+}
+
+long storeFLAC(AudioData *data, const char *fileName)
+{
+
+    uint8_t err = SF_ERR_NO_ERROR;
+    SF_INFO sfinfo =
+    {
+        .channels = data->numberOfChannels,
+        .samplerate = data->sampleRate,
+        .format = SF_FORMAT_FLAC | SF_FORMAT_PCM_16
+    };
+
+    SNDFILE *outfile = sf_open(fileName, SFM_WRITE, &sfinfo);
+    if (!outfile) return -1;
+
+    // Write the entire buffer to the file
+    long wr = sf_writef_float(outfile, data->recordedSamples, data->size / sizeof(float));
+    err = data->size - wr;
+
+    // Force write to disk and close file
+    sf_write_sync(outfile);
+    sf_close(outfile);
+    puts("Wrote to file!!!!");
+    return err;
+}
+
+int main(void)
+{
+    PaError err = paNoError;
+    if((err = Pa_Initialize())) goto done;
+    const PaDeviceInfo *info = Pa_GetDeviceInfo(Pa_GetDefaultInputDevice());
+    AudioData data = initAudioData(44100, info->maxInputChannels, paFloat32);
+    AudioSnippet sampleBlock =
+    {
+        .snippet = NULL,
+        .size = FRAMES_PER_BUFFER * sizeof(float) * data.numberOfChannels
+    };
+    PaStream *stream = NULL;
+    sampleBlock.snippet = malloc(sampleBlock.size);
+    time_t talking = 0;
+    time_t silence = 0;
+    PaStreamParameters inputParameters =
+    {
+        .device = Pa_GetDefaultInputDevice(),
+        .channelCount = data.numberOfChannels,
+        .sampleFormat = data.formatType,
+        .suggestedLatency = info->defaultHighInputLatency,
+        .hostApiSpecificStreamInfo = NULL
+    };
+
+    if((err = Pa_OpenStream(&stream, &inputParameters, NULL, data.sampleRate, FRAMES_PER_BUFFER, paClipOff, NULL, NULL))) goto done;
+    if((err = Pa_StartStream(stream))) goto done;
+    for(int i = 0;;)
+    {
+        err = Pa_ReadStream(stream, sampleBlock.snippet, FRAMES_PER_BUFFER);
+        if (err) goto done;
+        else if(avg(sampleBlock.snippet, FRAMES_PER_BUFFER) > 0.000550 && i < 1000) // talking
+        {
+            printf("You're talking! %d\n", i);
+            i++;
+            
+            time(&talking);
+            data.recordedSamples = realloc(data.recordedSamples, sampleBlock.size * i);
+            data.size = sampleBlock.size * i;
+            if (data.recordedSamples) memcpy((char*)data.recordedSamples + ((i - 1) * sampleBlock.size), sampleBlock.snippet, sampleBlock.size);
+            else
+            {
+                free(data.recordedSamples);
+                data.recordedSamples = NULL;
+                data.size = 0;
+            }
+        }
+        else //silence
+        {
+            double test = difftime(time(&silence), talking);
+            if (test >= 1.5 && test <= 10)
+            {
+                char buffer[100];
+                snprintf(buffer, 100, "file:%d.flac", i);
+                storeFLAC(&data, buffer);
+                talking = 0;
+                free(data.recordedSamples);
+                data.recordedSamples = NULL;
+                data.size = 0;
+            }
+        }
+    }
+
+done:
+    free(sampleBlock.snippet);
+    Pa_Terminate();
+    return err;
+}
\ No newline at end of file
diff --git a/cnlabtest/CN/A3/q2/client b/cnlabtest/CN/A3/q2/client
new file mode 100644
index 0000000..0b94312
Binary files /dev/null and b/cnlabtest/CN/A3/q2/client differ
diff --git a/cnlabtest/CN/A3/q2/client.c b/cnlabtest/CN/A3/q2/client.c
new file mode 100644
index 0000000..93873f3
--- /dev/null
+++ b/cnlabtest/CN/A3/q2/client.c
@@ -0,0 +1,89 @@
+#include <sys/socket.h>
+#include <stdio.h>
+#include <string.h>
+#include <netdb.h>
+#include <stdlib.h>
+#include <netinet/in.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+
+
+int main()
+{
+	char buf[100];
+	int sock_fd, t;
+	struct sockaddr_in clientaddr;
+	fd_set n;
+	memset(&clientaddr,0,sizeof(clientaddr));
+	sock_fd = socket(AF_INET,SOCK_STREAM,0);
+	if (sock_fd==-1)
+	{
+		printf("Socket creation error\n");
+		return 0;
+	}
+	
+	clientaddr.sin_family = AF_INET;
+	clientaddr.sin_addr.s_addr=INADDR_ANY;
+	clientaddr.sin_port=5005;
+	
+	t = connect(sock_fd,(struct sockaddr *)&clientaddr,sizeof(clientaddr));
+	if (t==-1)
+	{
+		printf("Connection error\n");
+		return 0;
+	}
+
+
+	printf("Type your Message and press Enter\n");
+	while (1)
+	{	
+		FD_ZERO(&n);
+		FD_SET(0,&n);
+		FD_SET(sock_fd,&n);
+		int ret=select(10,&n,0,0,0);
+		if (ret==-1)
+		{
+			printf("SELECT Error\n");
+			close(sock_fd);
+			return 0;
+		}
+		else if (FD_ISSET(0,&n))
+		{
+			
+			fgets(buf,100,stdin);
+			
+			t = send(sock_fd,buf,100,0);
+			if (t==-1)
+			{
+				printf("Message Send error\n");
+				return 0;
+			}	
+			if (strncmp(buf,"bye",3)==0)
+			{
+				close(sock_fd);
+				return 0;
+			}
+
+		}
+		else if (FD_ISSET(sock_fd,&n))
+		{
+			t = recv(sock_fd,buf,100,0);
+			if (t==-1)
+			{
+				printf("Message Receive error\n");
+				close(sock_fd);
+				return 0;
+			}
+			if (strncmp(buf,"bye",3)==0)
+			{
+				close(sock_fd);
+				return 0;
+			}
+			printf("\nMessage from Server: %s\n",buf);	
+		}
+	}
+	return 0;
+}
+
+//scp [remoteUserName]@[ip]:[path to file] [path where to copy in your comp.]
\ No newline at end of file
diff --git a/cnlabtest/CN/A3/q2/server b/cnlabtest/CN/A3/q2/server
new file mode 100644
index 0000000..a585e01
Binary files /dev/null and b/cnlabtest/CN/A3/q2/server differ
diff --git a/cnlabtest/CN/A3/q2/server.c b/cnlabtest/CN/A3/q2/server.c
new file mode 100644
index 0000000..d790436
--- /dev/null
+++ b/cnlabtest/CN/A3/q2/server.c
@@ -0,0 +1,113 @@
+#include <sys/socket.h>
+#include <stdio.h>
+#include <string.h>
+#include <netdb.h>
+#include <stdlib.h>
+#include <netinet/in.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+
+int main()
+{
+	int sock_fd, new_fd, t;
+	socklen_t len;
+	char buf[100];
+	fd_set n;
+	struct sockaddr_in serveraddr, clientaddr;
+
+	memset(&serveraddr,0,sizeof(serveraddr));
+	memset(&clientaddr,0,sizeof(clientaddr));
+
+	sock_fd = socket(AF_INET,SOCK_STREAM,0);
+	if (sock_fd==-1)
+	{
+		printf("Socket creation error\n");
+		return 0;
+	}
+	
+	
+	serveraddr.sin_family=AF_INET;
+	serveraddr.sin_addr.s_addr=inet_addr("127.0.0.1");
+	serveraddr.sin_port=5005;
+	
+	t = bind(sock_fd,(struct sockaddr *)&serveraddr,sizeof(serveraddr));
+	if (t==-1)
+	{
+		printf("Bind error\n");
+		return 0;
+	}
+	
+	t = listen(sock_fd,20);
+	if (t==-1)
+	{
+		printf("Listen error\n");
+		return 0;
+	}
+	
+	len = sizeof(clientaddr);
+	new_fd = accept(sock_fd,(struct sockaddr *)&clientaddr, &len);
+	if (new_fd==-1)
+	{
+		printf("New_FD error\n");
+		return 0;
+	}
+	printf("Type your Message and press Enter\n");
+	while (1)
+	{
+		FD_ZERO(&n);
+		FD_SET(0,&n);
+		FD_SET(new_fd,&n);
+		int ret=select(10,&n,0,0,0);
+		if (ret==-1)
+		{
+			printf("SELECT Error\n");
+			close(new_fd);
+			close(sock_fd);
+			return 0;
+		}
+		else if (FD_ISSET(0,&n))
+		{
+			fgets(buf,100,stdin);
+			
+			t = send(new_fd,buf,100,0);
+			if (t==-1)
+			{
+				printf("Message Send error\n");
+				return 0;
+			}	
+			if (strncmp(buf,"bye",3)==0)
+			{
+				close(new_fd);
+				close(sock_fd);
+				return 0;
+			}
+
+		}
+		else if (FD_ISSET(new_fd,&n))
+		{
+			t = recv(new_fd,buf,100,0);
+			if (t==-1)
+			{
+				printf("Message Receive error\n");
+				close(new_fd);
+				close(sock_fd);
+				return 0;
+			}
+			if (strncmp(buf,"bye",3)==0)
+			{
+				close(new_fd);
+				close(sock_fd);
+				return 0;
+			}
+			printf("\nMessage from Client: %s\n",buf);	
+		}
+	}
+	close(new_fd);
+	close(sock_fd);
+	return 0;
+}
+		
+		
+		
+	
diff --git a/cnlabtest/fork/client1.c b/cnlabtest/fork/client1.c
new file mode 100644
index 0000000..d4d41aa
--- /dev/null
+++ b/cnlabtest/fork/client1.c
@@ -0,0 +1,79 @@
+#include<stdlib.h>
+#include<netdb.h>
+#include<stdio.h>
+#include<netinet/in.h>
+#include<string.h>
+#include<sys/types.h>
+#include<sys/socket.h>
+#include<unistd.h>
+#define MAX 500
+#define PORT 5432
+
+
+
+
+
+int main(int argc, char* argv[])
+{
+	int sockfd , connfd;
+	struct sockaddr_in sin,cli;
+	struct hostent *hp;
+
+	char *host;
+
+	host = argv[1];
+
+	//printf("%s\n", host);
+	hp = gethostbyname(host);
+
+
+	
+
+	bzero(&sin, sizeof(sin));
+
+	sin.sin_family = AF_INET;
+	bcopy(hp->h_addr,(char*)&sin.sin_addr,hp->h_length);
+	sin.sin_port = htons(PORT);
+
+	sockfd = socket(PF_INET, SOCK_STREAM,0);
+
+	if(sockfd == -1)
+	{
+		printf("socket creation failed\n");
+	}
+
+
+	if(connect(sockfd,( struct sockaddr*)&sin,sizeof(sin))!=0)
+	{
+		printf("error\n");
+	}
+	else
+	{
+		printf("I am connected\n");
+
+			char name[7] = "hi.txt\0";
+
+			send(sockfd, name, sizeof(name),0);
+
+			// receive file
+
+			char file[11];
+
+			recv(sockfd, file, sizeof(file),0);
+
+			for(int i=0;i<11;i++)
+			{
+				file[i] = file[i] ^ 'S';
+			}
+
+			printf("%s\n", file);
+			FILE *fd = fopen("program1.txt", "w");
+			fprintf(fd,"%s",file);
+			
+
+	}
+	
+
+	close(sockfd);
+	
+}
diff --git a/cnlabtest/fork/client2.c b/cnlabtest/fork/client2.c
new file mode 100644
index 0000000..c03a9fa
--- /dev/null
+++ b/cnlabtest/fork/client2.c
@@ -0,0 +1,79 @@
+#include<stdlib.h>
+#include<netdb.h>
+#include<stdio.h>
+#include<netinet/in.h>
+#include<string.h>
+#include<sys/types.h>
+#include<sys/socket.h>
+#include<unistd.h>
+#define MAX 500
+#define PORT 5432
+
+
+
+
+
+int main(int argc, char* argv[])
+{
+	int sockfd , connfd;
+	struct sockaddr_in sin,cli;
+	struct hostent *hp;
+
+	char *host;
+
+	host = argv[1];
+
+	//printf("%s\n", host);
+	hp = gethostbyname(host);
+
+
+	
+
+	bzero(&sin, sizeof(sin));
+
+	sin.sin_family = AF_INET;
+	bcopy(hp->h_addr,(char*)&sin.sin_addr,hp->h_length);
+	sin.sin_port = htons(PORT);
+
+	sockfd = socket(PF_INET, SOCK_STREAM,0);
+
+	if(sockfd == -1)
+	{
+		printf("socket creation failed\n");
+	}
+
+
+	if(connect(sockfd,( struct sockaddr*)&sin,sizeof(sin))!=0)
+	{
+		printf("error\n");
+	}
+	else
+	{
+		printf("I am connected\n");
+
+			char name[7] = "hi.txt\0";
+
+			send(sockfd, name, sizeof(name),0);
+
+			// receive file
+
+			char file[11];
+
+			recv(sockfd, file, sizeof(file),0);
+
+			for(int i=0;i<11;i++)
+			{
+				file[i] = file[i] ^ 'S';
+			}
+
+			printf("%s\n", file);
+			FILE *fd = fopen("program2.txt", "w");
+			fprintf(fd,"%s",file);
+			
+
+	}
+	
+
+	close(sockfd);
+	
+}
diff --git a/cnlabtest/fork/client3.c b/cnlabtest/fork/client3.c
new file mode 100644
index 0000000..ac8c4ed
--- /dev/null
+++ b/cnlabtest/fork/client3.c
@@ -0,0 +1,79 @@
+#include<stdlib.h>
+#include<netdb.h>
+#include<stdio.h>
+#include<netinet/in.h>
+#include<string.h>
+#include<sys/types.h>
+#include<sys/socket.h>
+#include<unistd.h>
+#define MAX 500
+#define PORT 5432
+
+
+
+
+
+int main(int argc, char* argv[])
+{
+	int sockfd , connfd;
+	struct sockaddr_in sin,cli;
+	struct hostent *hp;
+
+	char *host;
+
+	host = argv[1];
+
+	//printf("%s\n", host);
+	hp = gethostbyname(host);
+
+
+	
+
+	bzero(&sin, sizeof(sin));
+
+	sin.sin_family = AF_INET;
+	bcopy(hp->h_addr,(char*)&sin.sin_addr,hp->h_length);
+	sin.sin_port = htons(PORT);
+
+	sockfd = socket(PF_INET, SOCK_STREAM,0);
+
+	if(sockfd == -1)
+	{
+		printf("socket creation failed\n");
+	}
+
+
+	if(connect(sockfd,( struct sockaddr*)&sin,sizeof(sin))!=0)
+	{
+		printf("error\n");
+	}
+	else
+	{
+		printf("I am connected\n");
+
+			char name[7] = "hi.txt\0";
+
+			send(sockfd, name, sizeof(name),0);
+
+			// receive file
+
+			char file[11];
+
+			recv(sockfd, file, sizeof(file),0);
+
+			for(int i=0;i<11;i++)
+			{
+				file[i] = file[i] ^ 'S';
+			}
+
+			printf("%s\n", file);
+			FILE *fd = fopen("program3.txt", "w");
+			fprintf(fd,"%s",file);
+			
+
+	}
+	
+
+	close(sockfd);
+	
+}
diff --git a/cnlabtest/fork/hi.txt b/cnlabtest/fork/hi.txt
new file mode 100644
index 0000000..c59f2ce
--- /dev/null
+++ b/cnlabtest/fork/hi.txt
@@ -0,0 +1 @@
+This is a sample file!!!!!!!!!!!!!!!!
diff --git a/cnlabtest/fork/program1.txt b/cnlabtest/fork/program1.txt
new file mode 100644
index 0000000..18e1714
--- /dev/null
+++ b/cnlabtest/fork/program1.txt
@@ -0,0 +1 @@
+This is a s
\ No newline at end of file
diff --git a/cnlabtest/fork/program2.txt b/cnlabtest/fork/program2.txt
new file mode 100644
index 0000000..18e1714
--- /dev/null
+++ b/cnlabtest/fork/program2.txt
@@ -0,0 +1 @@
+This is a s
\ No newline at end of file
diff --git a/cnlabtest/fork/program3.txt b/cnlabtest/fork/program3.txt
new file mode 100644
index 0000000..18e1714
--- /dev/null
+++ b/cnlabtest/fork/program3.txt
@@ -0,0 +1 @@
+This is a s
\ No newline at end of file
diff --git a/cnlabtest/fork/server.c b/cnlabtest/fork/server.c
new file mode 100644
index 0000000..ad7c247
--- /dev/null
+++ b/cnlabtest/fork/server.c
@@ -0,0 +1,95 @@
+#include<stdlib.h>
+#include<stdio.h>
+#include<netdb.h>
+#include<netinet/in.h>
+#include<string.h>
+#include<sys/types.h>
+#include<sys/socket.h>
+#include<unistd.h>
+#define MAX 500
+#define PORT 5432
+char buffer[32];
+
+
+int main()
+{
+	int sockfd , connfd;
+	struct sockaddr_in sin,cli;
+
+	sockfd = socket(PF_INET, SOCK_STREAM,0);
+
+	if(sockfd == -1)
+	{
+		printf("socket creation failed\n");
+	}
+
+	bzero(&sin, sizeof(sin));
+
+	sin.sin_family = AF_INET;
+	sin.sin_addr.s_addr = INADDR_ANY;
+	sin.sin_port = htons(PORT);
+
+	if(bind(sockfd,(struct sockaddr*)&sin,sizeof(sin))!=0)
+	{
+		printf("socket binding failed\n");
+	}
+
+	if(listen(sockfd,5)!=0)
+	{
+		printf("failed\n");
+	}
+	
+	for(int i=0;i<3;i++)
+	{
+		if(fork() == 0)
+		{
+			printf("[son] pid %d from [parent] pid %d\n",getpid(),getppid());
+			int len = sizeof(sin);
+			connfd = accept(sockfd, ( struct sockaddr*)&sin,&len);
+
+			if(connfd<0)
+			{
+				printf("accept failed\n");
+			}
+
+			else
+			{
+				printf("%d is  connected\n", getpid());
+				for(int i=0;i<32;i++)
+				{
+					buffer[i] = '\0';
+				}
+				recv(connfd, buffer , sizeof(buffer),0);
+
+				FILE* fp = fopen(buffer,"r");
+
+			
+				for(int i=0;i<32;i++)
+				{
+					buffer[i] = '\0';
+				}
+			    
+			  
+		    	char ch, ch2; 
+		    	for (i = 0; i < 32; i++) { 
+		    	    ch = fgetc(fp); 
+					printf("%c",ch);
+		        	ch2 = ch ^ 'S';
+		        	buffer[i] = ch2;     
+		    	} 
+				printf("\n");
+
+				send(connfd, buffer, sizeof(buffer), 0);
+			}
+
+			close(sockfd);
+			 
+            exit(0);
+		}
+		
+	}
+
+	for(int i=0;i<3;i++) // loop will run n times (n=5) 
+    wait(NULL);
+
+}