Do you have practical experience working with network protocols and technologies?

Practical experience with network protocols and technologies includes understanding and using protocols such as TCP/IP, UDP, HTTP, FTP, and others. In C/C++, this is often implemented through sockets.

For example, to create a simple TCP server in C++, you can use POSIX sockets:

#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <cstring>
#include <iostream>

int main() {
    int server_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (server_fd == 0) {
        perror("socket failed");
        return -1;
    }

    sockaddr_in address{};
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(8080);

    if (bind(server_fd, (struct sockaddr*)&address, sizeof(address)) < 0) {
        perror("bind failed");
        return -1;
    }

    if (listen(server_fd, 3) < 0) {
        perror("listen");
        return -1;
    }

    int addrlen = sizeof(address);
    int new_socket = accept(server_fd, (struct sockaddr*)&address, (socklen_t*)&addrlen);
    if (new_socket < 0) {
        perror("accept");
        return -1;
    }

    const char* hello = "Hello from server";
    send(new_socket, hello, strlen(hello), 0);
    close(new_socket);
    close(server_fd);
    return 0;
}

This experience allows you to create network applications, understand protocol features, work with low-level APIs, and ensure reliable data transmission.