GCSE Computing : OCR Computing Course Revision

Description

Some Flash Cards for the OCR GCSE Exam board for Computing
RoryOMoore
Flashcards by RoryOMoore, updated more than 1 year ago
RoryOMoore
Created by RoryOMoore over 7 years ago
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Resource summary

Question Answer
HARDWARE Hardware is physical (can be touched) CPU,GPU,MOUSE, KEYBOARD, MONITOR
SOFTWARE Operating System (OS) Most Important Support for other applications Windows, Mac, Linux Recognises Input Devices Sends Outputs
SOFTWARE Application Preforms a specific task Only comparable with certain OS Photoshop, Word, Steam
INPUT A input device put information into a computer to be processed. Keyboard, Mouse, Microphone
OUTPUT A output device takes processed information and outputs it from the computer. Monitor, Speakers, Printer
INPUT AND OUTPUT These devices can be both a input and output device. Tablet, Headset, Network Card
Logic Gates NOT: IF INPUT IS ON OUTPUT IS OFF AND: BOTH MUST BE ON OR: AT LEAST 1 MUST BE ON
Processor (CPU) Brain of the computer CPU does calculations Most important element of a computer system
NETWORKS Computer networks are connections between nodes that allow data to be exchanged. Local Area Network (LAN): Connects Computers close together Wide Area Network (WAN): Connects Computers over a large area (Internet)
Advantages of Networks Computers can share files and data to another computer. Printers can be shared and accessed by each computer. Data can be stored on a server and can be backed up and accessed by other Computers
Disadvantages of Networks LAN Computers are more likely to have security issues. Virus' can spread and computers can be hacked. Hardware required to connect LANs can be expensive. Technicians needed to maintain
Network Hardware (Switch) Switch: Device with many Ethernet ports to connect LAN computers. It forwards packets to the intended destination only using MAC Adresses
Network Hardware (Hub) Hub: Packets are sent to everything not just one MAC address
Network Hardware (Router) Router: Forwards packets from LAN to ISP then to Internet.
Network Hardware (Wireless Access Point) Access Point: This device allows access to a wired connection using Wi-Fi. Can be standalone and part of Router making a Wireless Router.
Database Management System (DBMS) Instead of storing data on lots of machines we store it on on Database Server. This means were all looking at the same data and ensures consistency. Lots of applications can use the same software.
The Star Topology Most home networks use this topology as it has a central connection point which could be a Hub, Switch or Router. Each Node is connected to the central point.
Advantages of Star Topology If one Cable fails the rest can still communicate. High performance because there is no data collision
Disadvantages of Star Topology Expensive to install all cables and hardware If the Central Device fails then the whole network will.
The Ring Topology Each Device is connected to two other devices. When a message is sent it travels in one direction and is received by each device until it meets it destination.
Advantages and Disadvantages of Ring Topology No data collision -- If any cables fail or a device fails the whole network will fail. Workstations can see information for intended for them. Security / Privacy Issue.
The Bus Topology All devices are connected to one cable (the bus). When a node communicates it travels down the bus that all devices receive but only the intended recipient accepts and processes the message.
Advantages of Bus Topology Cheap and easy to install as only a small quantity of cables are needed ---- If the bus fails then the whole network cant communicate. The more computers added the slower the network gets.
Client-Server Network Devices on this network is EITHER a client or server. Server: A provider of a service or resource Client: A requester of a service from a server BOTH NEED EACHOTHER
Peer-to-Peer Network Each device has the ability to be a Server or Client. Wi-Fi use peer-to-peer networks.
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