- Fundamental terminology
- Network standards organizations
- Standard network hardware examples
- Future issues
- Protocols
- OSI layers and internetworking
- Web-based commerce
Computer Networks - Networks are simply a set of computers connected by a communication medium, communicating by established conventions
- typically bursty transmission characteristics
- Network goals
- resource sharing
- high reliability
- replication of services
- although network may be single point of failure
- lower overall system costs with better performance
- a few shared high-end machines, many individual low-end machines
Computer Networks (continued) - Network categories
- local area networks (LAN)
- wide area networks (WAN)
- typically store and forward
- interconnected networks (internets)
Fundamental Terminology - Circuit switched / packet switched
- circuit switched = telephone
- connection route established at start of communication, maintained as long as communication continues
- route is dedicated to one communication
- packet switched
- whole communication is broken down into smaller chunks called packets
- each packet may take a different route to the destination
- routes may be shared by other communications
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