1.3 data transmission computer science

What is circuit switching?

When a route is dedicated for the duration of the community of two individuals

What are advantages of circuit switching?

Packets are delivered in the correct order

Decreases user experiences before and during call

What are disadvantages of circuit switching?

Higher cost to use only one channel per use

Doesn’t use resources efficiently

What is packet switching?

Packet switching is when individual packets take different routes across a network

What are the advantages of packet switching?

the file being transmitted is a lot more secure

disadvantages of a packet?

bandwidth is wasted during the period of time in which no data is sent

Must wait until all packets arrive before data is received

What is the contents of a packet?

Header

Footer

Ip address

Source address

The protocol

What is serial transmission?

Serial data is whensungle buts are sent one after the other along a single wire

Describe simplex transmission method

Data only travels in one direction meaning no packets are returned

What is half duplex transmission?

Transmission of data in either direction but not simultaneously

What is full duplex transmission?

Transmission of data in both directions simultaneously

Describe half duplex and duplex cable methods

Ethernet cable might have two pairs for uploading and for downloading. So the packets travelling in opposite directions don’t interfere with each other

What is multiplexing?

Involves taking multiple data streams and combining them to send across a single wire.

When data reaches its destination the single stream is split back into original streams

Why is multiplexing beneficial?

Save on costs

Increase transfer speeds in some circumstances

Good for linking serial and parallel transmissions

What is routing traffic?

When data is transferred over a network’s routing determines the path each data packet takes, ensuring packets are delivered quickly

How are network collisions dealt with?

Pc takes turns to send their packets

Priorities policy(one device always send a data first)