Computer Networks Evolution of Network Switching Techniques Categories of Networks Networks Elements Networks Topologies Network Transmission Media

1. BECE401L
Computer Communication
Introduction
S.Nandakumar
School of Electronics Engineering
VIT University

2. 2
Introduction
 Computer Networks
 Evolution of Network
 Switching Techniques
 Categories of Networks
 Networks Elements
 Networks Topologies
 Network Transmission Media

3. 3
Components
 Sender
 Message
 Receiver
 Medium/ Channel
 Protocol

4. 4
What is the Computer Network?
 A communication network is a set of nodes connected by
links and able to communicate with one another.
 A computer network is a communication network in
which nodes are computers.

5. 5
Data flow (simplex, half-duplex, and full-duplex)

6. What do you need to build a
computer network?
 Computers / Peripherals
 NICs
 Connecting Media
 Networking Device(s)
◦ Routers
◦ Switches
◦ Bridges
◦ Hubs
 Software
 Protocols
◦ Communication rules that all entity must agree on

7. Issues and Challenges
 MANET, VANET , WSN….etc…
 LoRa technology MAC layer
operations and Research issues
 Energy and Power optimization in
physical and MAC layer.
 Routing Protocol –Routing Algorithm
 Quality of Service (QoS)
◦ Quality of Service (QoS) aims to shape
the network behavior and provide
performance guarantees.

8. 8
Fundamental Characteristics:
 Delivery
 Accuracy
 Timing

9. 9
 Network Criteria
 Physical Structures
 Categories of Networks

10. 10
 Network Criteria

 Performance
 Depends on Network Elements
 Measured in terms of Delay and Throughput
 Reliability
 Failure rate of network components
 Measured in terms of availability/robustness
 Security
 Data protection against corruption/loss of data due to:
 Errors
 Malicious users