Data Exchange 2 Flashcards
What is Parallel transmission?
Data transmitted simultaneously over an equal number of channels
Short range with 5 meters
Used to connect printers to computers
What is serial transmission?
Data Transmitted one at a time over a single channel
Slower rate of data transfer
Can be used over large distances
What is Bi-directional transmission?
Data transmitting in both directions but not at the same time
What is a packet?
This is a method of breaking data files into small packets or chunks in order to send them across a network
What are the Benefits of packet switching?
It makes very efficient use of the network - no tied-up lines.
It can easily get around broken bits of the network.
As customers increase, the network only has to expand slowly comparedto circuit switching.
What are the Implications of wireless networks?
It’s a bit more difficult to setup properly
Risk of ‘outsiders’ accessing your network unless you set up the security (e.g. WPA, WPA2)
Significantly slower than a wired network (2 – 50 times slower)
The network can be less stable. Signals may interfere and walls may weaken the signal and disconnect
What are the Components of a wireless network?
router, access point and wireless adapter
What is a Router?
Router
A Router is a device that transfers data from one network to another in an intelligent way.
It has the task of forwarding data packets to their destination by the most efficient route.
What is an access point?
Access point
Built in router
The hardware device that allows this is called the ‘Wireless Access Point’ or WAP.
What is a Wireless network adaptor?
Wireless network adaptor
Turns a device with a USB to wireless
What is Client-side processing?
Client-side scripting enables interactionwithina webpage.
The interaction takes place within the webpage
What are the advantages of Client-side processing?
Benefits
Speed- faster once code has been downloaded
Security- more secure than server side as all actions take place on the downloaded page
What are the disadvantages of Client-side processing?
Disadvantages
Browser specific- not all scripts work so may need to create different versions
Computer speed- your computer speed may slow the interaction such as download speed
What is Server-side processing?
Involves the use of scripts that are run on another computer on the internet.
Information are submitted to a server which processes it to provide results in the form of a web page
What are the advantages of Server-side processing?
Benefits
Efficiency- complex codes can be run better as it does not have to be downloaded.
Speed- performance is effected by speed of web server. So speedy server= fast processing
