Understanding TCP/IP : a clear and comprehensive guide to by Libor Dostálek; Alena Kabelová
By Libor Dostálek; Alena Kabelová
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Additional resources for Understanding TCP/IP : a clear and comprehensive guide to TCP/IP protocols = Velký prûvodce protokoly TCP/IP a systémem DNS
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17: IP does not use virtual circuits. As the figure above shows, IP datagrams 1, 2, and 3 start from the node A to node B, but from this point, datagrams 1 and 3 are routed through a different path than datagram 2. The destination (node D) is then reached by each of them via a different path. Generally, IP datagrams may reach their destination in a different order than the order in which they were sent. So our IP datagrams could be received in the following order: 2, 1, and then 3. In the Internet hierarchy, TCP—a higher-layer protocol that establishes a connection and guarantees the delivery of data—is used above the connectionless IP.
Modems working in the baseband provide for much higher transmission rates. Sometimes these modems are referred to as Baseband Modems. 10: Baseband 46 Chapter 3 Modems working in the baseband are usually not automatic, because they are used on leased lines and use synchronous transmission. Till now, we have presumed that the transmission rate is the same in both directions. But from the point of view of an end user, the situation seems to be a bit different. An end user would prefer to have a higher downstream rate (from Internet to a user) than upstream rate (the opposite direction).
In addition to capturing frames, you can also choose Capture | Activation to prepare an action that can be automatically activated, like when a certain part of the buffer memory is exhausted. One interesting option is to activate whenever a frame containing a specified string in a particular position appears. The activation can also be triggered when a program starts up or when a file opens. 4: Captured frames 26 Chapter 2 You can see your chosen frame in the captured frame display. 5: Detailed display of the second frame Detailed information appears in three frames of windows.