Computing - Data Transmission 1
- Created by: Denise24
- Created on: 06-03-14 11:33
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- Data transmission
- Duplex Mode
- Simplex
- data travels one way only
- no collisions
- Half duplex
- data travels both ways one at a time
- walkie-talkie
- Full duplex
- data travels both ways
- no collisions
- Simplex
- Protocols
- Physical protocols
- governed by the hardware
- Logical protocols
- governed by the software
- Physical protocols
- Packets
- What is it?
- binary data that is capable of being routed around in a network
- What's in the header?
- Packet number
- Dest and Source IP address
- Time to live
- Synchronization
- has a limited size
- can be split into smaller chunks
- What is it?
- Error Detection
- CheckSum
- calculation is done and gives a CheckSum
- CheckSum sent along with the packet
- Dest PC performs the same calculation and check to see if they have the same CheckSum
- CheckSum sent along with the packet
- calculation is done and gives a CheckSum
- Parity Check
- Odd Parity
- Packet has odd number of 1's
- Even Parity
- packet has even number of 1's
- Odd Parity
- Echo
- Source PC send data over to Dest PC
- Dest PC sends data over to Source PC again
- Source PC compares the data sent with the original data
- If something is wrong, data is sent again
- Source PC compares the data sent with the original data
- Dest PC sends data over to Source PC again
- Source PC send data over to Dest PC
- CheckSum
- Duplex Mode
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