Telematics Chapter 6: Network Layer - Freie Universität Berlin

Two Fundamental Philosophies
● Connectionless communication (e.g. Internet)
● Data are transferred as packets of variable length
● Source and destination address are being indicated
● Sending is made spontaneously without reservations
● Very easy to implement
● But: packets can take different ways to the receiver
● Wrong order of packets at the receiver, differences in transmission delay, unreliability
● Connection-oriented communication (e.g. telephony)
● Connection establishment:
● Selection of the communication partner resp. of the terminal
● Examination of the communication readiness
● Establishment of a connection
● Data transmission: Information exchange between the partners
● Connection termination: Release of the terminals and channels
● Advantages: no change of sequence, reservation of capacity, flow control
Univ.-Prof. Dr.-Ing. Jochen H. Schiller ▪ cst.mi.fu-berlin.de ▪ Telematics ▪ Chapter 6: Network Layer
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