The footage, which blurs out all individuals other than the officers, shows the activity outside of the school during the bloody massacre that left 17 people dead. Deputy officer Scot Peterson was suspended after the department reviewed the footage, and prior to the public announcement of his failure to engage the shooter, resigned.
Data Link layer Physical layer A packet that is sent by us, goes from the top and to the bottom of this list, each layer adding its own set of headers to the packet in what we call the encapsulation phase. When the packet finally reaches it's destination the packet goes backwards through the list and the headers are stripped out of the packet, one by one, each header giving the destination host all of the needed information for the packet data to finally reach the application or program that it was destined for.
However, it is generally considered that there are 3 through 5 layers available, and in most pictures and explanations, there will be 4 layers discussed.
We will, for simplicities sake, only consider those four layers that are generally discussed. Just the same as with the OSI Reference Model, we add and subtract headers for each layer that we enter or leave.
For example, lets use one of the most common analogies to modern computer networking, the snail-mail letter. You want to send a letter to someone asking how they are, and what they are doing.
To do this, you must first create the data, or questions. The actual data would be located inside the Application layer. After this we would put the data written on a sheet of paper inside an envelope and write on it to whom the letter is destined for within a specific company or household.
Perhaps something like the example below: In the Transport layer, if we were dealing with TCP, this would have been equivalent to some port e. At this point we write the address on the envelope of the recipient, such as this: Andersgardsgatan 2 Gothenburg This would in the analogy be the same as the Internet layer.
Just the same way as the recipient on an envelope. This would be the equivalent of the IP address in other words e.
The final step is to put the whole letter in a postbox. Doing this would approximately equal to putting a packet into the Network Access Layer. The network access layer contains the functions and routines for accessing the actual physical network that the packet should be transported over.
When the receiver finally receives the letter, he will open the whole letter from the envelope and address etc decapsulate it. The letter he receives may either require a reply or not.
In either case, the letter may be replied upon by the receiver, by reversing the receiver and transmitter addresses on the original letter he received, so that receiver becomes transmitter, and transmitter becomes receiver.I had something similar this evening which was driving me batty.
Submitting a form was giving me the values in $_REQUEST but not in $_POST. Eventually I noticed that there were actually two requests going through on the network tab in firebug; first a POST .
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