What do u mean by OSI model? Explain
in brief of network layer
OSI is the acronym for open system interconnection. It describes
how information from one software application in one computer moves through
communication medium to software application in another computer. OSI
itself is not a network architecture because it does not specify the exact
services and protocols to be used in each layer. It just tells
what each layer should do.
Physical
and Data link layer are implemented in hardware and software. Other remaining
layers are implemeted in only software.
Network Layer:
§ PDU: packet
§ provides routing and
related functions that enable multiple data links to be combined into and
internetwork. This is accomplished by using logical addressing of devices.
§ supports both
connectionless and conection-oriented services from higher layer protocol.
§ Network layer protocols
typically are routing principle but other types of protocols are implemented as
well
§ provides congesgtion
control , best path determinations.
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