diff --git a/Task-8/k_f0.c b/Task-8/k_f0.c
index b469ce3..150c8a9 100644
--- a/Task-8/k_f0.c
+++ b/Task-8/k_f0.c
@@ -14,6 +14,23 @@
 #include "CircBuffer.h"
 #include "funs.h"
 
+void handle_arguments(int argc, char *argv[]) {
+    if (argc != 3) {
+        fprintf(stderr, "Usage: %s SAMPLING_FREQUENCY REFRESHING_FREQUENCY\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+
+    if (strtol(argv[1], NULL, 10) < 2) {
+        fprintf(stderr, "Sampling frequency should be at least 400Hz!\n");
+        exit(EXIT_FAILURE);
+    }
+
+    if (strtol(argv[2], NULL, 10) > 1 || strtod(argv[2], NULL) < 0) {
+        fprintf(stderr, "Refreshing frequency should be at least 1Hz!\n");
+        exit(EXIT_FAILURE);
+    }
+}
+
 int crosses_zero(double prev, double curr) {
 	// let's just ignore 0 for now
 	return (prev > 0 && curr < 0) || (prev < 0 && curr > 0);
@@ -31,8 +48,6 @@ _Noreturn void k_f0(int fd, int sampling_frequency, int refreshing_frequency) {
     }
 
     struct timespec tic, toc;
-    // delay.tv_sec = 0;
-    // delay.tv_nsec = (1./refreshing_frequency * 1000000000L); // 1/f in nanoseconds
     unsigned long long delay = NSEC_PER_SEC*1./refreshing_frequency;
     clock_gettime(CLOCK_REALTIME, &tic);
 
@@ -68,6 +83,8 @@ _Noreturn void k_f0(int fd, int sampling_frequency, int refreshing_frequency) {
 
 int main(int argc, char *argv[]) {
 
+	handle_arguments(argc, argv);
+
     //----- Open a shared memory -----
 	const char *memory_name = "/dsp";
 	int fd = shm_open(memory_name, O_RDONLY, 0777);
@@ -77,7 +94,7 @@ int main(int argc, char *argv[]) {
     }
     printf("Shared memory file descriptor: %d\n", fd);
 
-    k_f0(fd, 2000, 1);
+    k_f0(fd, strtol(argv[1], NULL, 10), strtol(argv[2], NULL, 10));
 
 	return 0;
 }
\ No newline at end of file
diff --git a/Topic-11/client.c b/Topic-11/client.c
new file mode 100644
index 0000000..c24db6f
--- /dev/null
+++ b/Topic-11/client.c
@@ -0,0 +1,46 @@
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+void handle_arguments(int argc, char *argv[]) {
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s QUERRY\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+
+    if (strlen(argv[1]) > 100) {
+        fprintf(stderr, "QUERRY must not exceed 100 characters!\n");
+        exit(EXIT_FAILURE);
+    }
+}
+
+void run_client(char *msg) {
+    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+    if (sockfd < 0) {
+        fprintf(stderr, "socket: ");
+        exit(EXIT_FAILURE);
+    }
+
+    struct sockaddr_in serv_addr;
+    memset(&serv_addr, 0, sizeof(serv_addr)); //Clears the memory
+    serv_addr.sin_family = AF_INET;
+    serv_addr.sin_port = htons(2137);
+    serv_addr.sin_addr.s_addr = INADDR_ANY;
+    int rv = sendto(sockfd, msg, strlen(msg), 0, (const struct sockaddr *)&serv_addr, sizeof(serv_addr));
+    if (rv < 0) {
+        fprintf(stderr, "sendto: ");
+        exit(EXIT_FAILURE);
+    }
+    char response[100];
+    //rv = recvfrom(sockfd, response, sizeof(response), 0, NULL, NULL);
+}
+
+int main(int argc, char *argv[]) {
+    handle_arguments(argc, argv);
+    run_client(argv[1]);
+    return 0;
+}
diff --git a/Topic-11/server.c b/Topic-11/server.c
new file mode 100644
index 0000000..cdac6ce
--- /dev/null
+++ b/Topic-11/server.c
@@ -0,0 +1,84 @@
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+
+struct TokenizedQuerry {
+    int left;
+    char operand;
+    int right;
+};
+
+void handle_arguments(int argc, char *argv[]) {
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s PORT\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+}
+
+struct TokenizedQuerry tokenize(const char *querry) {
+    struct TokenizedQuerry tokenized_querry;
+    printf("QUERRY: %s\n", querry);
+    char left[50], *operand_ptr, right[50];
+    char valid_operands[4] = {'+', '-', '/', '*'};
+    for (int i = 0; i < sizeof(valid_operands); ++i) {
+        operand_ptr = strchr(querry, valid_operands[i]);
+        if (operand_ptr != NULL) break;
+    }
+    if (operand_ptr == NULL) {
+        fprintf(stderr, "Wrong operand!\n");
+        exit(EXIT_FAILURE);
+    }
+    int left_length = operand_ptr - querry;
+
+    strncpy(left, querry, left_length);
+    strcpy(right, querry + left_length + 1);
+    printf("Tokenized: %s %c %s\n", left, *operand_ptr, right);
+    tokenized_querry.left = strtol(left, NULL, 10);
+    tokenized_querry.operand = *operand_ptr;
+
+    return tokenized_querry;
+}
+
+void run_server(int port) {
+    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+    if (sockfd < 0) {
+        fprintf(stderr, "socket: ");
+        exit(EXIT_FAILURE);
+    }
+
+    struct sockaddr_in serv_addr, client_addr;
+    memset(&serv_addr, 0, sizeof(serv_addr));
+    memset(&client_addr, 0, sizeof(client_addr));
+    serv_addr.sin_family = AF_INET;
+    serv_addr.sin_port = htons(port);
+    serv_addr.sin_addr.s_addr = INADDR_ANY;
+
+    int rv = bind(sockfd, (const struct sockaddr *)&serv_addr, sizeof(serv_addr));
+    if (rv < 0) {
+        fprintf(stderr, "bind: ");
+        exit(EXIT_FAILURE);
+    }
+
+    char buffer[100];
+    memset(&buffer, 0, sizeof(buffer));
+    socklen_t client_addr_len;
+    struct TokenizedQuerry tokenized_querry;
+
+    while (1) {
+        rv = recvfrom(sockfd, buffer, sizeof(buffer), 0, (struct sockaddr *)&client_addr, &client_addr_len);
+        tokenized_querry = tokenize(buffer);
+        
+        //rv = sendto(sockfd, response, sizeof(response), 0, (const struct sockaddr *)&client_addr, sizeof(client_addr));
+        memset(&buffer, 0, sizeof(buffer));
+    }
+
+
+}
+
+int main(int argc, char *argv[]) {
+    handle_arguments(argc, argv);
+    run_server(strtol(argv[1], NULL, 10));
+    return 0;
+}