DATA COMMUNICATION

What are the four fundamental characteristics for effective data communication system?

• delivery - correct destination or intended user

• accuracy - no alteration or corruption

• timeliness - no delays

• jitter - variation in packet arrival time

Explain data transmission modes (simplex, half duplex, etc.)

Simplex - one way(e.g. tv, radio)

Half Duplex - two-way, but not same time (e.g. citizens band, walkie-talkie)

Full Duplex - two-way and same time (e.g. telephone, cellphone)

Explain data transmission types

Serial Transmission

• bits transmitted one after another

• slower, long distance

Parallel Transmission

• bits transmitted all at once

• faster, shorter distance

Explain DTE and DCE

Data Terminal Equipment - source or destination of data

Data Communications Equipment - “middleman”, takes data from DTE then convert it into signal that can travel over a network

Explain Line Configuration

Two-Point or Point-to-Point - connected exclusively in one link

Multipoint - two or more devices sharing a link, used to interconnect a mainframe computer to many computers

Define client and server

Client - requests service or resource

Server - provides service, stores data, and shares resources

Explain network criteria

• Performance - measure of how fast and efficient the network is

• Reliability - how dependable the network is

• Security - protection of data