分享到微信
The TTL field was originally designed to hold a time stamp, which was decremented by each visited router. The datagram was ( 1 ) 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 ( 2 ) number of hops (routers) visited by the datagram. When a source host sends the datagram, it ( 3 ) a number in this field. Each router that processes the datagram decrements this number by 1. If this 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 routers for a long time without ever getting delivered to the ( 4 ).This field limits the ( 5 ) of a datagram.
(1)A.received
B.discarded
C.rejected
D.tansferred
(2)A.maximum
B.minimum
C.exact
D.certain
(3)A.controls
B.transmits
C.stores
D.receives
(4)A.switch
B.router
C.source host
D.destination host
(5)A.lifetime
B.moving time
C.receiving time
D.transmitting time
信管網參考答案：B、A、C、D、A
查看解析：m.xomuzic.com/st/4048627556.html
相關推薦：
掃碼關注公眾號
溫馨提示：因考試政策、內容不斷變化與調整，信管網網站提供的以上信息僅供參考，如有異議，請以權威部門公布的內容為準！
信管網致力于為廣大信管從業(yè)人員、愛好者、大學生提供專業(yè)、高質量的課程和服務，解決其考試證書、技能提升和就業(yè)的需求。
信管網軟考課程由信管網依托10年專業(yè)軟考教研傾力打造，官方教材參編作者和資深講師坐鎮(zhèn)，通過深研歷年考試出題規(guī)律與考試大綱，深挖核心知識與高頻考點，為學員考試保駕護航。面授、直播＆錄播，多種班型靈活學習，滿足不同學員考證需求，降低課程學習難度，使學習效果事半功倍。
相關內容
| 發(fā)表評論 查看完整評論 | |
考試新手指南
學習計劃攻略
精華備考資料
案例論文干貨
章節(jié)模擬試題
免費試聽課程
考試信息推送