163、It is not what you say but what you do that impresses people most.

131、3.The input data( ) is frames which are transmitted sequentially.

130、2.In other words, the user determines data and instructions are recorded on them.

129、ROM chips are for applications in which data is only read.

128、data analysis

127、neywork layer

126、client machine

125、home page

124、star network

123、cable modem

122、data link layer