HOW NETWORKS SUPPORT HCI PRESENTED BY JOYCE NGANGA EDWINA ODIWANOR MOHAMMED LAMINE KONATE

How Networks Support HCI  WHAT IS NETWORK?  BRIEF HISTORY OF NETWORKS  WHY WE NEED NETWORKING  WHO REQUIRES NETWORKS

Types of Networking  Local Area Network  A local area network (LAN) is a network that is confined to a relatively small area. Such as school or building.  Wide Area Network  A wide area networks (WANs) connect larger geographical areas, such as London, Africa, or the world.

Network Topology  What is a Topology?  The physical topology of a network refers to the configuration of cables, computers, and other peripherals.  The logical topology is the method used to pass information between workstations.

Network operating system  What is a network operating system?  Unlike operating systems, such as DOS and WINDOWS that are designed for single users to control one computer, the network operating systems ( NOS) coordinate the activities of multiple computers across a network.  It acts as a director to keep the network running smoothly.

Types of NOS Client/server Client/server network operating systems allow the network to centralize functions and applications in one or more dedicated file servers.  Peer –to-Peer Peer-to-peer network operating systems allow users to share resources and files located on their computers and to access shared resources found on other computers.

Client/server network

Peer-to-Peer network

Network security  Firewall  A firewall is special software or hardware designed to protect a private computer network from unauthorised access.  User name and password You usually have to enter a user name and password when you want to access information on a network.

Firewall and Password

Impact of Networks on HCI Advantages  High performance interaction  Allows communication  Accessibility of resources  Increases computing power  Faster accessibility of information  Global connectivity

Disadvantages  Expensive  Encourages pirating (Breaching copyright regulations)  Encourages exchange of illicit information or materials  Lack of security  Computer usage is monitored  Affects multi-user access  Uncontrollable access  Inefficient feedback and response

HCI Activities Supported By Networks  Educational  Domestic  Business  Social and Welfare  Leisure  Health and safety

References   A. Dix,J. Finlay, G.D.Abowd, R.Beale;Human- Computer Interaction;3 rd Edition,Prentice Hall Printers  Readers Digest Edition :Teach Yourself Computers and the Internet, IDG Books Worldwide, Inc.  Shoniregun, C. A.(2004), Questioning the boundary issues of internet security  Burns Tom & Sinfield Sandra,(2003),Essential Study Skills