Server 1 sends a message to workstation 2: Question 11 options: All Workstations

Question

Server 1 sends a message to workstation 2:

Question 11 options:

All Workstations

Workstations 1, 2, and 3

Workstations 1, 2, 3, 7, and 8

Only Workstation 2

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Question 12

In a sliding window system with each byte numbered, Station A sends a packet with bytes numbered 801 to 900. If the packet arrives with no errors, how does Station B respond?

Question 12 options:

Station B sends ACK 900

Station B sends ACK

Station B sends ACK 901

Station B sends NAK 901

Question 13

For characters 1001011, 1011111, 0101010, 1010101, and 0011001 longitudinal parity bits with odd parity have been used. Complete both parity column and parity row?

                    Data Parity

                     column

DATA

Column Parity

1

0

0

1

0

1

1

?

1

0

1

1

1

1

1

?

0

1

0

1

0

1

0

?

1

0

1

0

1

0

1

?

0

0

1

1

0

0

1

?

Row Parity

?

?

?

?

?

?

?

?

You may copy the data shown below in your answer box and then put values for "?" mark. Or, you can just write the values of parity column and parity row in the following way:

Column Parity : <show the values here>

Row Parity : <show the values here>

All Workstations

Workstations 1, 2, and 3

Workstations 1, 2, 3, 7, and 8

Only Workstation 2

Explanation / Answer

Q13

Column and row parity bits are added to make the number of 1's even so as to use it to check for errors at the destination. If the source and target parity doesn't match then the data is considered to be erroneous.

Column Parity : 001010

Row Parity : 11100100

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