|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
|Preforms a specific task Only comparable with certain OS Photoshop, Word, Steam
|A input device put information into a computer to be processed. Keyboard, Mouse, Microphone
|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
|NOT: IF INPUT IS ON OUTPUT IS OFF AND: BOTH MUST BE ON OR: AT LEAST 1 MUST BE ON
|Brain of the computer CPU does calculations Most important element of a computer system
|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.
|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
|Each device has the ability to be a Server or Client. Wi-Fi use peer-to-peer networks.