问题
单项选择题
如果源知道目的地的IP地址，但不知道它的MAC地址，下面哪个协议可以用来确定这个信息？（）
A.RIP
B.ARP
C.IGRP
D.OSPF
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
如果源知道目的地的IP地址，但不知道它的MAC地址，下面哪个协议可以用来确定这个信息？（）
A.RIP
B.ARP
C.IGRP
D.OSPF
参考答案：B
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| I live in a big city with a lot of homeless people. Luckily there're small ways of helping them and you needn't have a lot of 1 . One way to help is to buy their monthly magazine. 2 doing this one day, I got to_ 3 a young homeless man. He was often 4 the magazine at the train station. He was a poor farmer from another country. After a while, I discovered that his 5 was close to mine. It 6 that we were born in the same month. I met him last year 7 after his birthday, and after congratulating(祝贺) him, without 8 , I asked if he had had a good day. He 9 and said that he hadn't really celebrated. I felt so 10 . I just couldn't bear the thought of (不敢想)this nice, young man being 11 on his 25th birthday with no presents, no cake, nothing! So I went home and looked in my yarn(纱线) basket. 12 for me, I had enough yarn 13 . I set to work and knitted(编织) a 14 for the young man. The yarn had become a little dirty 15 I didn't knit very often. Then I washed the yarn so the scarf would be 16 when he got it. I met him on my own birthday as I was going shopping. I had 17 to meet him so I had 18 the scarf and a piece of my own birthday 19 around with me. He was very happy with these gifts and so was I. The 20 in his eyes was the best present he could have given me! | ||||
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