History of Computing
This will help you understand the History of Computing!
Input Devices
Key Board
Computer Mouse
Touch Screen (Iphone 6)
Output Devices
Computer
AC (Air Conditioner)
Printer
CPU
RAM
Power Supply
Network Card
Graphics Card
Mother Board
Hard Drive
Alan Turing
Alan Turing was not a well known figure during his lifetime. But today he is famous for being an eccentric yet passionate British mathematician, who conceived modern computing and played a crucial part in the Allied victory over Nazi Germany in WW2. He had played a crucial part in as he had cracked the code.
He was also a victim of mid-20th Century attitudes to homosexuality – he was chemically castrated before dying at the age of 41.
The three different types of network
Star Network
Bus Network
Ring Network
Star network
Advantages and disadvantages of a star network
The advantages of a star network are:
- it is very reliable – if one cable or device fails then all the others will continue to work
- it is high-performing as no data collisions can occur
The disadvantages of a star network are:
- it is expensive to install as this type of network uses the most cable (network cable is expensive)
- extra hardware is required (hubs or switches) which adds to cost
- if a hub or switch fails, all the devices connected to it will have no network connection
Ring Network
Advantages and disadvantages of a ring network
This type of network can transfer data quickly, even if there are a large number of devices connected because the data only flows in one direction, so there won’t be any data collisions. However, the real disadvantage is that if the main cable fails or any device is faulty, then the whole network will fail.
Bus Network
Advantages and disadvantages of a bus network
The advantages of a bus network are:
- it is easy to install
- it is cheap to install, as it doesn't require much cable
The disadvantages of a bus network are:
- if the main cable fails or gets damaged the whole network will fail
- as more workstations are connected the performance of the network will become slower because of data collisions
- every workstation on the network "sees" all of the data on the network – this is a security risk