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About TCPIP Data communication questions Question 4 (10 marks) Data

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about TCP/IP Data communication questions Question 4
(10 marks) Data Link Layer a) (2 marks Senders and
receivers have agreed to use even parity. Acting as a
sender, add a parity bit to the following bit sequences. 010
01100 011010 01100100 b) (2 marks) Senders and
receivers have agreed to use odd parity. Are the following
received bit sequences correct? 1001 010101 0110110
011101101 c) (3 marks) An ASCII transmission scheme
uses DLE STX control characters to start a frame and DLE
ETX to end a frame. Using character stuffing (hint: only
DLE needs to be escaped), what are the ASCII sequences
to transmit the following data streams? ABCD AB DLE STX
CD ABC ETX DLEDETX d) (3 marks) A bit-oriented
protocol uses the flag bits 011lli10 to start and end the
frame. What will be the transmitted frames for the following
streams of bits? 01010111000 01111110
00001110111110000111111111111110000
Solution
Odd parity
The total number of ones = odd
One single parity bit is appended to each block of data
Hamming distance for the parity bit = 2
(a)
010 will become 111
01100 will become 11100

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011010 will become 111110
01100100 will become 11110100
(b)
1001 is not correct as the total number of ones are not
odd
010101 is correct as there are 3 ones - an odd number of
ones
0110110 is not correct as the total number of ones are not
odd
011101101 is not correct as the total number of ones are
not odd
(c)
Data Link Escape Start of TeXt = DLE STX
Data Link Escape End of TeXt = DLE ETX
We will use some reserved characters that will indicate the
begining and completion of
a data frame
DLE STX Frame begins Frame ends DLE ETX
As our data stream itself contains some DLE, we need to
replace each occurence of DLE with double DLE DLE
At the receiver end he/she will reverse the process of
converting the double DLE to a single DLE
Example: If the frame contained ``A B DLE D E DLE\'\',
the characters transmitted over the channel would
be ``DLE STX A B DLE DLE D E DLE DLE DLE ETX\'\'.

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about TCP/IP Data communication questions Question 4 (10 marks) Data Link Layer a) (2 marks Senders and receivers have agreed to use even parity. Acting as a sender, add a parity bit to the following bit sequences. 010 01100 011010 01100100 b) (2 marks) Se nders and receivers have agreed to use odd parity. Are the following received bit sequences correct? 1001 010101 0110110 011101101 c) (3 marks) An ASCII transmission scheme uses DLE STX control characters to start a frame and DLE ETX to end a frame. Using character stuffing (hint: only DLE needs to be escaped), what are the ASCII sequences to transmit the following data streams? ABCD AB DLE STX CD ABC ETX DLEDETX d) (3 marks) A bit -oriented protocol uses the flag bits 011lli10 to start and end the frame. What will be the transmitted frames for the following streams of bits? 01010111000 01111110 00001110111110000111111111111110000 Sol ...
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