2.1.6 Networking Flashcards
(37 cards)
What is file compression?
An algorithm that’s used to decrease the size of the file (make it smaller)
Advantages of file compression
Allows transfer speed to be quicker, takes up less storage space, smaller files reduce network congestion, uses fewer bits of data, fast download speed
Properties of lossless compression
Original file CAN be reconstructed once deconstructed, doesn’t lose any information, e.g. PNG
Properties of lossy compression
Deletes data that they think is unnecessary e.g. sounds humans cant hear and colour differences we wouldn’t notice. Original file CANT be reconstructed once deconstructed, e.g. JPEG
What does a DSLR do?
Allows formats such as TIFF and NEF, which are either compressed slightly or not at all
What is a network?
A set of computers and devices that are connected in order to share resources
What types of resources can networks share?
Information, application, software and hardware
Advantages of networks
Sharing devices like printers saves money, files can easily be shared between users, users can communicate by email and instant messenger, data is easy to backup as all the data is stored on the file server
Disadvantages of networks
Expensive to purchase the network cabling and file servers, if the server breaks down all files become inaccessible, viruses can spread quickly throughout the network, danger of hacking
What is a NIC and what does it do?
NIC is a Network Interface Cable, it has a dedicated MAC address and controls data coming in and out, gives you a MAC address
What does a hub do?
A hub allows many devices to connect to the network
What does a switch do?
A switch sends data to the required recipient
What does a router do?
A router manages the IP’s of the computer, packets and switches
What does a bridge do?
A bridge connects the networks together for communication
What does a modem do?
A modem allows connection to the internet
What is a LAN?
A Local Area Network that covers a small geographical area like a home or office
What is a WAN?
A Wide Area Network covers a large geographical area like a university/college campus or a corporate building
What is a PAN?
A Personal Area Network covers a very small area like a room, and example of PAN is bluetooth
What is a Client Server Network?
A network where the file server hold all the files, which individual client computers can access. They are connected to one server instead of each other
What are advantages of a Client Server Network?
All files are stored in a central location. Network peripherals, backups and network security are controlled centrally. Users can access shared data
What are disadvantages of a Client Server Network?
A specialist network operating system is needed. The server is expensive to purchase. Specialist staff are needed. If any part of the network fails a lot of disruption can occur
What is a Peer to Peer Server Network?
A network where all computers are connected directly together and can share files if permission is given
What are the advantages of a Peer to Peer Server Network?
No need for a network operating system. Doesn’t need an expensive server. Doesn’t need specialist staff. Easier to set up. If one computer fails it wont affect the others
What are the disadvantages of a Peer to Peer Server Network?
Can slow down user performance. Files and folders can’t be centrally backed up. Files aren’t organised in a specific shared area. Stopping viruses is the individual users responsibility. Little to no security besides permissions
