Flashcards
3.1.5 Data Transmission
Cards in this deck (22)
- 1What does LAN and WAN stand for?LAN- Local Area Network
WAN- Wide Area Network - 2What is a LAN?In the same building or close proximity
Connected with etinet cables
or WIFI connection
All owned by the main owner - 3What is a WAN?Connected through telecommunications
Over a large area- could be global - 4What is a Hub?sends to everything, rejected by those who is not addressed to
- 5What is a Switch?Sends to device which data is addressed to.
- 6What does LAN connect through?Modem- Converts between analog & digital
Router
NOS- Network Operating System - 7What is Series?Moving one bit at a time down a single channel
- 8What is Parallel?Moving multiple bits across multiple channels
- 9What is Simplex?One way sending of data
- 10What is Duplex?Both way sending of data at the same time
- 11What is Half Duplex?Both way sending of data but only one at a time
- 12What is Circuit Switching?Packets of data, all the same size, numbered in order
Sent along a reserved channel all at the same time on the same route same order
They are then combined by the receipt - 13What is Packet Switching?Packets of Data, all the same size, and numbered (3 of 4)
Sent out individually the fastest route available. They may take different routes.
Do not arrive in the correct order
Re ordered through number system and combined
more secure as dont take the same route- difficult to intercept all packets. - 14What is Bit Rates?Document/Email
Downloaded before or after sent
Quality doesn't change with data rate - 15What is Time Sensitivity?Video Conference
Low data rate results in- Low picture quality, Buffering (Time differences)
Loses value (Pixels) - 16What is a Parity Check?In each packet, odd or even
Decided by protocol
MSB: Parity bit allocated by to ensure packet odd or even - 17What is Check Sums?Sender of data calculated sum of data
Send data with sum to recipient
Recipient runs same calculation compares
Sends back to sender if different
Sender resend data if incorrect - 18What is Echoing Back?Data sent
Recipient sends it back
Data compared to original
If different data is resent - 19Definition of a ProtocolA set of rules that govern communication (data transfer)
- 20What is a Physical Protocol?Wires or Wireless
- 21What is a Logical Protocol?Error Checking
Packet Size
Packet or Circuit Switching - 22What is Layering Protocols?Can Change things in isolation without changing the flow of the system
Information
- Description
- A Level Computing (F451) Flashcards on 3.1.5 Data Transmission, created by Molly Hills on 30/11/2014.
- Created by
- Molly Hills
- Views
- 12
- Tags
- Rating