By Enric Peig Olivé
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It presented vulnerabilities similar to those in WEP, mainly due to the security of the keys and the way they were managed. WPA2 is far harder to crack. It is therefore highly recommendable to configure all devices on the network to use this standard. The following table shows a summary of the main characteristics of the three systems: WEP WPA WPA2 Year�it�appeared 1999 2003 2004 Integrity CRC32 Michael Michael Encryption RC4 RC4/TKIP AES-128 AES-128 AES-128 will be incorporated to comply with the security requirements imposed by the US government in FIPS140-2.
The server responds with various pieces of information including the methods supported. • The client sends a DESCRIBE request for certain content and the server answers it. • The client sends a SETUP request for each stream included in the presentation indicating the correct protocols for each stream (for example, audio and video). The client then initialises the applications needed to reproduce the streams in the presentation. • The client sends a SET_PARAMETER to set an acceptable bandwidth. • Lastly, the client sends a PLAY command to begin data transmission.
What has happened, has happened, and there is no way around it. In this case, the loss of a packet is not critical. We can say the same for a packet that is out of sequence. If we have already shown the following images by the time it arrives, then it does not matter. It behaves as if the packet was not lost. The same is also valid when a packet arrives with errors. In this case, the TCP will ask for it to be re-transmitted, and to ensure the packet order is correct, they will not be sent to the application layer until the incorrect packet has been received.