Worksheets2.2 Error detection
Total questions: 18
Worksheet time: 11mins
Order the stages of an ARQ check
A code is calculated using the data in the packet
Data is transmitted with the code
Data is received and the code is recalculated from the data in the packet
If the codes match a positive acknowledgement is sent back
If the codes match a positive negative is sent back
If the sending computer gets a positive ARQ acknowledgement it will
immediately send the data again
do nothing
try to fix errors
wait and then send the data again
If the sending computer gets a negative ARQ acknowledgement it will
immediately send the data again
do nothing
try to fix errors
wait and then send the data again
ARQ checks that
data has been received
data has been received without any corrupted data
data has been sent
data has been sent to the correct device
ARQ stands for
Automatic Return Query
Automated Request Query
Automatic Repeat Query
Automated Reference Query
ARQ is
an authentication check
a verification check
a type of checksum
a validation check
What does the sending computer do if it receives a negative ARQ acknowledgement?
Immediately send the data again
Do nothing
Try to fix errors
Wait and then send the data again
The ARQ check
is included in the data packet header
is sent separately from a data packet
is included in the data packet trailer
is included in the data packet payload
What kinds of ARQ responses are possible
positive
negative
neutral
In an even parity scheme, what would be the correct parity bit for the binary string:
1101 0001
1 1101 0001
0 1101 0001
1 101 0001
1101 0001 1
In an odd parity scheme, what would be the correct parity bit for the binary string:
1101 0001
1 1101 0001
0 1101 0001
0101 0001
1101 0001 0
In an even parity scheme, what would be the correct parity bit for the binary string:
0000 0000
0 0000 0000
1 0000 0000
0000 0000 0
1 1000 0000
What are check digits and parity bits used for?
Detecting errors in data transmission
Adding numbers together
Calculating binary values
Encoding data packets
How are check digits calculated?
By adding numbers to another number
By counting the number of ones in a binary string
By calculating the sum of all digits
By multiplying two numbers together
What happens if there is an error in the parity bit?
The data is correct
The data is ignored
The data is resent
The data becomes invalid
What is the main purpose of check digits and parity bits?
To ensure data accuracy
To encrypt data
To compress data
To transmit data faster
What is the consequence of an error in the parity bit?
The data is incorrect
The data is ignored
The data is compressed
The data is encrypted
What are the limitations of parity check?
Inability to detect multiple bit errors and inability to correct errors.
Inability to detect transmission errors and inability to correct errors.
Inability to detect any errors and inability to correct errors.
Inability to detect single bit errors and inability to correct errors.
