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TCP Provides a one-to-one, connection-oriented, reliable communications service. TCP is responsible for the establishment of a TCP connection, the sequencing and acknowledgment of packets sent, and the recovery of packets lost during transmission. UDP Provides a one-to-one or one-to-many, connectionless, unreliable communications service. UDP is used when the amount of data to be transferred is small (such as data that fits into a single packet), when the overhead of establishing a TCP connection is not desired, or when the applications or upper-layer protocols provide reliable delivery.

public static void main(String args[])

When two computers communicate using TCP, the computer that initiates the communication is known as the client, regardless of whether it is running a client or server operating system, and the responding computer is known as the host If the client and host are on the same network segment, the client computer first uses ARP to resolve the host s MAC address by sending a broadcast for the IP address of the host Once the client has the MAC address of the host, it can commence communication to the port on the host by using the transport layer protocol specified by the application There are 65,535 TCP and UDP ports, beginning with 0 Ports 1023 and below are regarded as well-known ports for legacy reasons, and ports above 1023 are known as high ports Functionally, no difference exists between the well-known ports and the high ports.

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birdsFrame frame = new birdsFrame("The birds application");

On the host, an application is bound to a certain port it specifies and is initialized in a listening state, where it waits for requests from a client When the client initiates a connection to a TCP port, a defined series of packets, known as a three-way handshake and illustrated in Figure 19-1, constructs a session for reliable packet transmission The steps for establishing connections follow: 1 The client sends the host a synchronization (SYN) message that contains the host s port and the client s Initial Sequence Number (ISN) TCP sequence numbers are 32 bits in length and used to ensure session reliability by facilitating out-of-order packet reconstruction 2 The host receives the message and sends back its own SYN message and an acknowledgement (ACK) message, which includes the host s ISN and the client s ISN incremented by 1 3.

The client receives the host s response and sends an ACK, which includes the ISN from the host incremented by 1 After the host receives the packet, the TCP session is established..

frameshow();

Part III:

framehide();

SYN (Client ISN = 123654781) (Server ISN = 7835) SYN/ACK (ISN = 123654782) (Server ISN = 7836) ACK (ISN = 123654783) (Server ISN = 7837)

Figure 19-1

frameresize(330, 320);

When the communication between the client and host is complete, the session is closed once the following steps occur: 1. The client sends a finalization (FIN) message to the host. The session is now half closed. The client no longer sends data but can still receive data from the host. Upon receiving this FIN message, the host enters a passive closed state. 2. The host sends an ACK message, which includes the client s sequence number augmented by 1. 3. The server sends its own FIN message. The client receives the FIN message and returns an ACK message that includes the host s sequence number augmented by 1. 4. Upon receiving this ACK message, the host closes the connection and releases the memory the connection was using.

birds applet = new birds();

To see port activity on your computers that run Windows Server 2003, Windows 2000, or Windows XP, you can use the Netstat.exe command. Netstat.exe will also show the status of TCP ports. The syntax for using Netstat.exe follows, and Table 19-3 describes the options available when using this command.

frameadd("Center", applet);

NETSTAT [-a][-e][-n][-o][-s][-p proto][-r][interval]

Description Displays all connections and listening ports. Displays Ethernet statistics. This can be combined with the -s option. Displays addresses and port numbers in numerical form. Displays the owning process ID (PID) associated with each connection. This option does not exist in Windows 2000. Shows connections for the protocol specified by protocol, which can be TCP, UDP, TCPv6, or UDPv6. If used with the -s option to display per-protocol statistics, the value for protocol can be IP, ICMP, TCP, or UDP. Displays the routing table. Displays per-protocol statistics. By default, statistics are shown for IP, ICMP, TCP, and UDP. Determines the refresh interval for the data displayed by Netstat.

appletinit();

19:

appletstart();

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