data communication lecture 02
TRANSCRIPT
Key Data Communication Terminology
Networks and their need Distributed Processing Network CriteriaNetwork Applications
Today ‘s Topics
Key Data Communication Terminology
Session: communication dialog between network users
or applications
Network: interconnected group of computers and
communication devices
Node: a network-attached device
Key Data Communication Terminology
Link: connects adjacent nodes
Path: end-to-end route within a network
Circuit: the conduit over which data travels
Key Data Communication Terminology
Packetizing:dividing messages into fixed-length packets prior to transmission over a network’s communication media
Routing:determining a message’s path from sending to receiving nodes
Networks- And their need:Point to point communication not usually practical
Devices are too far apartLarge set of devices would need impractical number of connections
Solution is to connect all devices to a central system known as a NETWORK
Two Main Classes of NetworksLocal Area Networks (LANs)Wide Area Network (WANs)
Networks- And their need:
Distributed Processing
“Instead of a single large machine being responsible for all aspects of a
process, each separate computer handles a subset of the task”
Advantages of Distributed Processing
Security Distributed Data basesFaster Problem SolvingSecurity through RedundancyCollaborative Processing
Network ApplicationsMarketing and SalesFinancial ServicesManufacturingElectronic MessagingTeleconferencingCable Television