在数据链路协议中，帧定界符标志由0111给出。假设采用位填充，则发送器将数据序列01110110发送为
(A) 01101011
(B) 011010110
(C) 011101100
(D) 0110101100答案： (D)
解释：
In the above question, if, in the data link layer bits stuffing is employed
then bit stuffing is done using the flag delimiter. If there is a flag
of n bits then we will compare the data sequence with the flag and for every
n-1 bits matched found, a bit 0 is stuffed in the data sequence after the matched
sequence.
Thus using the above logic
Delimiter flag: 0111
Data sequence: 01110110
So, for a flag of 4 bits we will compare data sequence with pattern of
3 bits i.e. 011.
0 1 1 0 1 0 1 1 0 0
In the above pattern the underlined bits are found matched, hence, 0 in italics
is stuffed. Thus resulting in the data sequence as 0110101100 which is option D
本说明由Namita Singh提供。
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