Test Answers

1ai.
Share Files
Share one printer
Share internet connection
Less Secure

1aii.
Bit Rate - Faster if something needs immediate response
Data Content - Weather its Live (Real-time) or Delay e.g. Live = Faster needed, Real-time = Slower

1b.
Router - Divides the 2 networks
Modem - Converts Analog Signal to Digital Signal
Proxy -Monitors and restricts to and from Network
Firewall - Restricts access to Network

2a.
Protocol is a set of Rules for communication

2bi.
Bit Rate - Speed
Packet Switching - Transmission type
Parity Checks - Checks for errors

2bii.
Circuit Switching - Doesn't Break it up, Slower
Packet Switching - Sending data across multiple cables simultaneously in parallel

3.
Used as an error checker. Parity is based on checking if there is an even or odd number of ones. If an even number of ones are changed, an error is not reported/detected.

4a.
Checksums are a form of error detection in which the sum of a packet of bytes is found and is sent across to the target before the actual data. used as error detection. If the checksum is the same as the sum of the packet of bytes that arrives there is no error.

4bi.
Message Broken up. Whole Network used. Spread Message over whole network. Every available path. Reassembled at other end. Efficient use of Network

4bii.
Faster use of network
More Efficient
Harder to Hack
Faster but less reliable
More chance of errors

5ai.
One Bit

5aii.
One Byte

5aiii.
One Way Only

5aiv.
Two Way. One at a time e.g. Walkie Talkie.

5bi.
Even Number of ones to check for errors. If there is an even number of ones it will not display an error.

5bii.
If there is an even number of ones flipped no error will be displayed.