In response, the scanned host returns a packet with the SYN and ack flags set if the port is open.

如果该端口是打开的，则被扫描主机返回设置了syn和ack标志的包进行响应。

youdao

The tcp_input () routine on the client side processes the SYN ACK packet, and calls tcp_output () to send an ACK packet back to the server.

客户端上的 tcp_input ()例程处理SYN ACK包，并调用 tcp_output ()将 ACK 包发回到服务器。

youdao

The server answers with a packet where both the SYN and ACK flags are set.

服务器以设置了 SYN和ACK 标志的包应答。

youdao

The server answers with a packet where both the SYN and ACK flags are set.

服务器以设置了 SYN和ACK 标志的包应答。

youdao