在数据链路协议中,帧分隔符标志由 0111 给出。假设使用位填充,发送器发送数据序列 01110110 为
(一) 01101011
(乙) 011010110
(三) 011101100
(四) 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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