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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_______
admin
2020-05-13
29
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、controls
B、transmits
C、stores
D、receives
答案
C
解析
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