Living in a Network-Centric World

1. Living in a Network-Centric World Week 1

2. Objectives • Describe how networks impact our daily lives • Describe the role of data networking in the human network • Identify the key components of any data network

3. The Ice breaker • Discuss with your peers • How networks impact our daily lives • Role of data networking in human networks • Identify the • Opportunities presented • Challenges posed by modern networks CSY1017-Computer Communications

4. How networks impact our daily lives CSY1017-Computer Communications

5. How Networks Impact Daily Life • Using information networks to share and collaborate improves teaching and learning

6. Role of data networking in the human network. Popular communication media • Instant messaging • Weblogs (Blogs) • Podcasting • Wikis CSY1017-Computer Communications

7. Networks Supporting the way we work • Intranets: Private networks in use by just one company, enable businesses to communicate and perform transactions among global employee and branch locations. • Extranets: To provide suppliers, vendors, and customers limited access to corporate data to check order status, inventory, and parts lists.

8. Networks Supporting The Way We Play • Explore places of interest interactively or preview actual destinations before a trip • Posting photographs about an event online for others to view • Participate in online games • Preview motion pictures

9. What is communication? • Establishing the Rules • . Among the protocols that govern successful human communication are: • An identified sender and receiver • Agreed upon method of communicating (face-to-face, telephone, letter, photograph) • Common language and grammar • Speed and timing of delivery • Confirmation or acknowledgement requirements

10. Quality of communications • Factors affecting message travel between can be either external or internal. • External Factors • The quality of the pathway between the sender and the recipient • The number of times the message has to change form • The number of times the message has to be redirected or readdressed • The number of other messages being transmitted simultaneously on the communication network • The amount of time allotted for successful communication

11. Four Elements of a Network • Rules or agreements to govern the messages are sent, directed, received and interpreted • The messages or units of information that travel from one device to another • A means of interconnecting these devices – a medium that can transport the messages from one device to another • Devices on the network that exchange messages with each other

12. Rules • Rules govern every step of the process, from the way cables are designed to the way the digital signals are sent • These rules are called protocols, e.g. TCP/IP protocol stack

13. Elements of a network • Icons are commonly used to represent networking devices. • Some devices originate messages that comprise our communication. • Some devices are used to direct and manage messages across the network. • Switch – A common device for interconnecting local area networks • Firewall - provides security to networks • Router - helps direct messages as they travel across a network • Wireless Router • Cloud - used to summarize a group of networking devices • Serial Link - one form of interconnection, represented by the lightning bolt-shaped line

14. Challenges • Connectivity • Speed, data rate, bandwidth • Quality • Availability • Fault Tolerance • Redundancy, backup.. • Recovery • Mitigating Threat • Security CSY1017-Computer Communications

15. Conclusions • This week we looked at: • How computer networks impact our lives? • What is computer communications • Four major elements that constitute a computer network • Protocol: basic definition • Glossary of network elements

16. Next Week • Computer Network Architectures • Types • Centralised Systems • Distributed Systems • Client Server • Peer-to-peer • Characteristics • Tiered Structure • Communication networks components • Challenges CSY1017-Computer Communications