Network Topologies & Standards

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Presentation transcript:

Network Topologies & Standards Vivian Arzola

Overview Preliminary Terms Hardware Basics Topologies Channel Access Methods Standards

Preliminary Terms Node – interconnected devices in a computer network e.g. terminals, computers, printers, scanners, servers, repeaters, routers, etc. Link – Physical medium connecting two nodes cable wireless Packet – small block of data transmitted at one time header data trailer

Hardware Basics Wireless Transmission Media: Radio Infrared Microwave Lightwave (laser)

Hardware Basics… Copper cables Coaxial (thick/thin) Twisted Pair (STP/UTP)

Hardware Basics… Coaxial cable

Hardware Basics… Twisted Pair

Hardware Basics… Fiber Optic Cable Single Mode Multimode

Hardware Basics… Multimode Fiber Optic Cable

Topologies Point-to-Point Multipoint (Broadcast) dedicated physical connections impractical for LAN’s used for long-distance networks

Topologies… Tree Topology (point-to-point)

Topologies… Tree Topology (point-to-point)

Topologies… Point-to-Point Multipoint (Broadcast) dedicated physical connections impractical for LAN’s used for long-distance networks shared communication channel requires coordinating use (delays) reduces cost

Topologies… Bus Topology

Topologies… Ring Topology

Topologies… Star Topology

Channel Access Methods… (preventing collisions!) Carrier Sense Multiple Access (CSMA) checks for electrical activity before transmission Carrier Sense Multiple Access with Collision Detection (CSMA/CD) supports collision recovery binary exponential backoff

Channel Access Methods… (preventing collisions!) Polling delays single point of failure no monopolization Token-Passing zero collisions equal access great performance on high traffic networks

Channel Access Methods… (preventing collisions!) Demand Priority can assign priorities costly single point of failure

Standards

Standards…

Standards…

Standards…

Questions?