2006-10-11 06:24:08 · 3 answers · asked by Anonymous in Computers & Internet ➔ Computer Networking
As a data session leaves a computer and enters a network (at layer 5-7), the stream is broken into 'packets'; these groups of data are defined at the beginning and the end by a header (layer 4), whose purpose is to tell a transmitting device where the data begins and ends, so that information added onto the data isn't confused for part of the data itself!
When a packet enters a network device such as a router or switch (layer 3), the packet is broken into smaller pieces called frames (layer 2) - these also contain headers that have the same purpose as packet headers.
By the time a chunk of data is physically transmitted on a wire (or other medium, layer 1), it is broken into several smaller units that are "individually wrapped and labelled" so that the larger message can be re-constructed using the smaller parts in the proper order, once they reach their destination.
It would be like taking apart a car, labelling and wrapping each part, boxing and shipping it across the world, then unpacking the parts and reassembling the car.
2006-10-11 06:38:08 · answer #1 · answered by drumrb0y 5 · 0⤊ 0⤋
OSI kind is a layered kind stepped forward for communications between 2 structures. It has seven layers that's used in springing up products for communications between structures in a community. here are the 7 layers : * application * Presentation * consultation * delivery * community * documents hyperlink * actual
2016-10-16 02:03:26 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Eh? do you mean at what point in the OSI model does encapsulation take place ?
2006-10-11 06:27:27 · answer #3 · answered by Funky G 5 · 0⤊ 0⤋