Eduqas A-Level Computer Science data transmission and representation overview quiz quiz

Parallel, because it is always faster than serial regardless of distance

Serial, because there is no skew between wires

Parallel, because it uses more wires and so spreads the signal load out

Neither method works reliably over a long distance, so a wireless link is required

the source and destination addresses

a sequence number for reassembly

the user's password in plain text

error-checking data such as a checksum

$96$

$106$

$108$

$126$

invert the bits only

add one only

swap the first and last bits

invert the bits and add one

$1.0...$

$0.1...$

$1.1...$

$0.0...$

precision

the number of channels

range of magnitudes

the colour depth

$8$

$16$

$128$

$256$

sample rate $\times$ duration $\times$ bit depth $\times$ channels

width $\times$ height $\times$ colour depth $\times$ duration $\times$ channels

sample rate $\div$ bit depth, then multiplied by the clip duration in seconds

duration $\times$ colour depth $\times$ the number of separate audio channels

The exact original file can always be restored perfectly after decompression

It permanently removes some data to achieve a smaller file

It is required for text documents, where no data may ever be lost at all

It never reduces the file size, but only reorganises the data within the file

decrypt the data, while the private key is the one that encrypts it

delete the data once it has been received and read by the recipient

encrypt the data, while the private key decrypts it

compress the data before it is sent across the network connection

correct any error that occurs during transmission, restoring the original bits

compress the data so that fewer bits need to be sent across the channel

encrypt the data so that an interceptor cannot read the transmitted bits

detect a single-bit error by making the number of 1s even or odd

a field that refers to the primary key of another table

a field that uniquely identifies each row in its own table

a field that is always encrypted

the first column of every table