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      希賽網(wǎng)為大家整理了2017上半年網(wǎng)絡(luò)工程師考試上午真題，以下為第八部分。

      下圖為某公司網(wǎng)絡(luò)管理員規(guī)劃的新辦公大樓網(wǎng)絡(luò)拓撲圖，針對該網(wǎng)絡(luò)規(guī)劃，以下說法中不合理的是（69）

      A.核心交換機之間可以采用VRRP、虛擬化等技術(shù)手段

      B.網(wǎng)絡(luò)內(nèi)各VLAN之間訪問需要經(jīng)過兩臺核心交換設(shè)備中的一臺

      C.接入交換機多采用三層交換機

      D.網(wǎng)絡(luò)拓撲結(jié)構(gòu)可靠

      在對網(wǎng)絡(luò)設(shè)備巡檢中，檢測到交換機端口有大量的CRC錯包，結(jié)合錯包呈現(xiàn)出不斷上漲的趨勢，下面故障原因中，不可能的是（70）

      A.端口狀態(tài)異常

      B.物理鏈路故障

      C.電磁干擾

      D.病毒攻擊

      If two communicating entities are in different hosts connected by a network，there is a risk that PDUs will not arrive in the order in which they were sent，because they may traverse(71)paths through the network.If each PDUs is given a unique number，and numbers are assigned(72)，then it is a logically simple task for the receiving entity to reorder(73)PDUs on the basis of sequence number.A problem with this scheme is that，with a(74)sequence number field，sequence number will repeat.Evidently，the maximum sequence number must be(75)than the maximum number of PDUs that could be outstanding at any time.

      A.same

      B.different

      C.single

      D.Unique

      A.randomly

      B.equally

      C.uniformly

      D.Sequentially

      A.received

      B.sent

      C.transmitting

      D.Forwarding

      A.various

      B.diverse

      C.finite

      D.infinite

      A.smaller

      B.greater

      C.less

      D.More

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