题目内容

有以下程序main(){int i,s=1;for (i=1;i<50;i++) if((i%5==0)&&(i%3==0)) s+=i;printf("%d\n",s);}程序的输出结果是（）

A. 409
B. 277
C. 1
D. 91

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The units of data exchanged by a link-layer protocol are called ( ).

A. datagrams
B. frames
C. segments
D. messages

Which of the following protocols is not a link-layer protocol? ( )

A. Ethernet
B. PPP
C. HDLC
D. IP

In Link Layer Services of Ethernet, Error Correction is:

A. Cyclic Redundancy Check
B. Internet checksum
C. Read after Write
D. NONE

Which of the following services can not offered by a link-layer protocol? ( )

A. congestion control
B. Link Access
C. Error control
D. Framing