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Of course, if more than one device is involved, things become more complicated In the example shown in Figure 9-1, PC-B also has a session to the server This connection has a source port number of 50,000 and a destination port number of 23 another telnet connection This brings up an interesting dilemma How does the server differentiate between PC-A s connection that has port numbers 50,000/23 and PC-B s, which has the same Actually, the server uses not only the port numbers at the transport layer to multiplex sessions, but also the layer 3 IP addresses of the devices associated with these sessions In this example, notice that PC-A and PC-B have different layer 3 addresses: 1111 and 1112, respectively Figure 9-2 shows a simple example of using port numbers between two computers PC-A opens up two telnet sessions to PC-B Notice that the source port numbers on PC-A are different, which allows PC-A to differentiate between the two telnet sessions The destination ports are 23 when sent to PC-B, which tells PC-B which application should process the segments Notice that when PC-B returns data to PCA, the port numbers are reversed, since PC-A needs to know what application this is from (telnet) and which session is handling the application

9 10

No matter where a session begins, or how many sessions a device encounters, a host can easily differentiate between various sessions by examining the

FIGURE 9-2

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Connection 1 Source port = 23 Destination port = 50,000

Source port = 23 Destination port = 50,001

TCP and UDP use completely different processes when establishing a session with a remote peer As you probably already have guessed, UDP uses a fairly simple process With UDP, one of two situations will occur that indicate that the session is established:

20 46 55 75 110

147 147

The source sends a UDP segment to the destination and receives a response The source sends a UDP segment to the destination

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As to which of the two are used, that depends on the application And as to when a UDP session is over, that is also application-specific:

If you have some dark, underexposed photos, you may be able to save them using the Shadows/Highlights command discussed in 7 You may also have some washed-out photos where the sky is too light Don t discard these photos; you may be able to rescue them using layers and blending modes

The application can send a message, indicating that the session is now over,

period, the application assumes the session is over TCP, on the other hand, is much more complicated It uses what is called a defined state machine A defined state machine defines the actual mechanics of the beginning of the state (building the TCP session), maintaining the state (maintaining the TCP session), and ending the state (tearing down the TCP session) The following sections cover TCP s mechanics in much more depth

With reliable TCP sessions, before a host can send information to another host, a handshake process must take place to establish the connection Figure 9-3 shows the steps involved In Figure 9-3, PC-A wants to send data reliably to PC-B via TCP Before this can take place, PC-A must establish the session to PC-B The two hosts go through a three-way handshake to establish the reliable session The following three steps occur during the three-way handshake:

1 2 3 4 5

FIGURE 9-3

1 The source sends a synchronization (SYN) segment (where the SYN control flag is set in the TCP header) to the destination, indicating that the source wants to establish a reliable session 2 The destination responds with both an acknowledgment and synchronization in the same segment The acknowledgment indicates the successful receipt of the source s SYN segment, and the destination s SYN flag indicates that a session can be set up (it s willing to accept the setup of the session) Together, these two flag settings in the TCP segment header are commonly referred to as SYN/ACK; they are sent together in the same segment header 3 Upon receiving the SYN/ACK, the source responds with an ACK segment (where the ACK flag is set in the TCP header) This indicates to the destination that its SYN was received by the source and that the session is now fully established Once the three-way handshake has occurred, data can be transferred across the session Because the connection was established first, this type of service is referred to as connection-oriented Remember that this type of connection always goes through a three-way handshake before one device can start sending and receiving information from another

Open an image that s overexposed or washed-out Open the Layers palette Select the background layer, and drag it to the Create A New Layer icon Select the new layer Change to the Multiply blending mode This will give the image better contrast and detail

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