计算机网络练习题B.docVIP

计算机网络练习题B 名词解释 计算机网络 C/S模式 端口 MAC地址 ATM技术 DCE、DTE设备 令牌（Token）在码元速率为1600波特的调制解调器中，采用8PSK（8相位）技术，计算可获得的数据速率。 (x)=x3+x2，求其CRC校验码。 已知路由表如下： 目的网络 子网掩码 下一跳 128.96.39.０ 28 接口０ 28 28 接口１ 0 28 R2 ＊默认 R3 　　现收到３个分组，其目的站地址如下：0、2、51，试计算其下一跳。 ***阅读程序 下面是一个利用WinSock API编写的Web服务器软件： #include winsock2.h #include stdio.h #include stdlib.h #include string.h #define BUF_SIZE 80 #define HOSTNAME localhost #define PORT 80 char buffer[BUF_SIZE]; void finish(int code) { if ( WSACleanup() == SOCKET_ERROR ) { fprintf(stderr, Encounter error while clean up WinSock.\n); code = 1; } exit(code); } int main(int argc, char *argv[]) { WORD wVersionRequested; WSADATA wsaData; int err; SOCKET socket1, socket2; struct sockaddr_in server1, client1; struct hostent *hp; signed long int len, count = 0; char path[255], root[255], temp[255]; char response[1024]; char line[1024]; int pos; FILE *stream1; int readcount; // 处理参数 if ( argc 2 ) { strcpy(root, .\\); printf(The current directory is used as the root directory of document.\n); } else { strcpy(root, argv[1]); printf(%s is used as root directory.\n, root); } // 初始化Winsock wVersionRequested = MAKEWORD( 2, 0 ); err = WSAStartup( wVersionRequested, wsaData ); if ( err != 0 ) { /* Tell the user that we couldnt find a usable */ /* WinSock DLL. */ fprintf(stderr, Could not find a usable WinSock DLL.\n); finish(1); } /* The WinSock DLL is acceptable. Proceed. */ // 建立套接字描述符 if ( (socket1 = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET ) { fprintf(stderr, Encountered error while create a new socket.\n); finish(1); } // 获得主机host信息 if ( (hp = gethostbyname(HOSTNAME)) == NULL ) { fprintf(stderr, Encountered error while get host IP address.\n); finish(1); } server1.sin_family = AF_INET; server1.sin_port = htons(PORT); memcpy((char *)server1.sin_addr, (char *)hp-h_addr, hp-h_length); // 绑定地址信息 if ( bind(socket1, (struct sockaddr *)server1, sizeof(se