TCP ports versus UDP ports

Question

hi all i'm trying to understand the difference between connecting on TCP versus UDP ports.
My understanding is that you connect to TCP Ports like this
new Socket(server, port);
A TCP port scan would consist of trying to connect to ports 1 to 65536.
Is that correct ?
Now sending a message to UDP
try {
dsock=new DatagramSocket();
} catch (SocketException se) {
response="SocketException: " + se.toString();
try {
dsock.send(new DatagramPacket(message.getBytes(),
     message.getBytes().length,
          InetAddress.getByName(server),
          port)
} catch (UnknownHostException e) {
response+="UnknownHostException:" + e.toString();
} catch (IOException e) {
     response+="IOException: " + e.toString();
Would I also try to send the message on UDP with ports 1-65536
Stephen

Answer 1

Do you have
http://www.kohala.com/start/tcpipiv1.html
in your library? If not, get it.
In case you don't have time, however, there are basically five things that direct a packet: the source IP address, the source port, the protocol (e.g. TCP or UDP), the destination IP address, and the destination port.