Notes

Outline

Network Fundamentals

Network Jargon LAN WAN GAN Bridge Router Gateway

Network Topologies Hierarchy (Mainframe) Ring Star Bus Selection based on cost, speed and error-recovery

Transmission Protocols Agreed principles for line access, collision avoidance, receipt verification, error identification, etc. OSI Layers Physical – RS 232 Data link – data frame creations Network – routing messages around network Transport – network-independent packet creation Session – User connection on Network Presentation – translate message to application Application – user services like security

Major Examples Ethernet – 1973, XEROX PARC Basic bus topology for LANs TCP/IP – Common WAN protocol

Organizational Network Strategies Terminal to Host File Server Client/Server Thick and Thin Presentation Application Logic Data Management