Function of Layers - Data Communication - Lecture Slides, Slides of Data Communication Systems and Computer Networks

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DATA

COMMUNICATION

Lecture-

Recap of Lecture 7

 Categories of Networks (MANs)

 Internetworks

 The OSI Model

Critique of OSI Model

Bad Timing

Bad Technology

Bad Implementations

Apocalypse of Two Elephants

Physical Layer

Physical Layer Functions

 Physical Characteristics of Interface and Media

 Representation of Bits/ Encoding

 Data Rate/ Transmission Rate

 Synchronization of Bits

Data Link Layer

 Responsible for Node-To-Node Delivery

 Makes Physical Layer error free to the upper layers

Data Link Layer

Data Link Layer Example

Network Layer

 Responsible for Source-to-Destination

delivery

 Network Layer ensures that each

packet gets from its point of origin to its final destination

Network Layer Functions

 Logical Addressing

 Routing

Network Layer Example