2. 计算机
  3. The TTL field was originally designed to hold a time stamp．which was decremented by each visited router．The datagram Was_______

The TTL field was originally designed to hold a time stamp．which was decremented by each visited router．The datagram Was_______

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问题 The TTL field was originally designed to hold a time stamp．which was decremented by  each visited router．The datagram Was________________ when the value became zero．However，for this  scheme，all the machines must have synchronized clocks and must know how long it takes  for a datagram to go from one machine to another．Today,this field is used mostly to  control the________________  number of hops(reuters)visited by the datagram．When a source host  sends the datagram，it________________  a number in this field．Each router that processes the datagram  decrements this number by 1．Ifthis value，after being decremented，is zero，the router discards  the datagram．This field is needed because routing tables in the Internet can become corrupted． A datagram may travel between two or more reuters for a long time without ever getting  delivered to the ________________．This field limits the________________ of a datagram．
选项 A、switch
B、router
C、source host
D、destination host
答案D
解析
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