【正文】 t miss to regret, don39。 to let strangers people care about your life in the good things, the original is not easy 10, do not blame, do not laugh at who, also don39。 not disillusioned after the heart, such as ashes, but experience the storm after the enlightenment。 【問(wèn)題 3】（ 6 分，每空 2 分）如果 IPSec 采用傳輸模式，則需要在 PC1 和 (5)上配置 IPSec 安全策略。 optiondomainnameservers (7) , (8) ?！菊f(shuō)明】某公司計(jì)劃部署園區(qū)網(wǎng)絡(luò)，其建筑物分布如圖 11 所示。為了使該公司的網(wǎng)絡(luò)地址在路由表中只占一行，給它指定的子網(wǎng)掩碼必須是 (57)。 (37) D ●某用戶正在 Intemet瀏覽網(wǎng)頁(yè)，在 Windows命令窗口中輸入 (38)命令后得到下圖所示的結(jié)果。 (15) D ●曼徹斯特編碼的效率是 (16)% ， 4B/5B 編碼的效率是 (17)% 。 2020 年上半年軟考《網(wǎng)絡(luò)工程師》上午試卷（參考答案版） ●位于 CPU與主存之間的高速緩沖存儲(chǔ)器 Cache用于存放部分主存數(shù)據(jù)的拷貝，主存地址與 Cache地址之間的轉(zhuǎn)換工作由 (1)完成。 (16) (17) B,C ARP 協(xié)議的作用是 (18)，它的協(xié)議數(shù)據(jù)單元封裝在 (19)中傳送。(38) A. arpaB. ipconfig/all C. route (39)A．由本機(jī)發(fā)出的 Web頁(yè)面請(qǐng)求報(bào)文 B．由 Intemet返回的 Web響應(yīng)報(bào)文 C．由本機(jī)發(fā)出的查找網(wǎng)關(guān) MAC地址的 ARP報(bào)文 Intemet 返回的 ARP響應(yīng)報(bào)文 A,A ●在 Windows 系 統(tǒng) 中 ， 默 認(rèn) 權(quán) 限 最 低 的 用 戶 組 是 (40) 。 (56) B． 8 C． 16 D． 24 (57) B． 25 . B,D ● 以下給出的地址中，屬于子網(wǎng) (58) 。 根據(jù)需求分 析結(jié)果，網(wǎng)絡(luò)規(guī)劃要求如下： 1． 網(wǎng)絡(luò)中心機(jī)房在信息大樓。} 【問(wèn)題 3】（ 6 分，每空 2 分）如果要確保 IP地址 分配給圖 21 中的 PC，需要在 DHCP 配置文件中補(bǔ)充以下語(yǔ)句。在PC1 的 IPSec 篩選器屬性窗口頁(yè)中（圖 42），源 IP地址應(yīng)設(shè)為 (6) ，目標(biāo) IP 地址應(yīng)設(shè)為 (7) 。 not unrewarding perfunctorily, but calm attitude of life of unrestrained selfconfidence. Plain living, there is no noise noisy, no earthly troubles, more did not fill in the discontent of desire, some just a calm, a calm. 3, memory of heart will not good things to erase the, life is a When no movie, pain is a beginning, the struggle is a kind of process, death is a kind of ending. Give up this giving up is the helpless, do not give up the abandoned, do not give up this giving up is ignorance, do not give up should not give up is persistent. 4, a thing figured is heaven, think impassability is hell. Since the living, to live better. Sometimes we because of too narrowminded, too care around the chores and penny wise and pound foolish, not worth the candle. Some things to attract trouble and worry, pletely depends on how we look at and deal with it. Don39。t envy who. Like a person is a kind of feeling, not like a person is true. The truth is easy to explain, I feel Is unspeakable. The best travel life is that you in a strange place found a long lost touched. 11, happy life not in the bustling in, and in the peace of mind。t wait for old just miss. Time to return, seize every moment, again painstakingly again tired also Those struggling to fly. 23, life could not Yimapingchuan, even flat pavement, inevitably there will be a few pieces of roadblocks. Some of the rocks around the past, while others have to move it out. Just move others put the stone is very easy, because the stone from the appearance we can discern。 choose a simple, is choose to be happy. The plex world like a Significance of pride. Hope is the ornate palace, outside people admiring the magnificent, living in the deep knowledge of living it to pay the price. Simple world as a simple log cabin outside ridiculed shabby, the heart is willing to go live to know the joy. Suffering and joy is their own choice. 22, learn how to use a single powerful heart, let the past be the past, let the future e. Life is really the end of the end of an eagle is flying wings, life is constantly pursuit. Don39。s mouth, because words will reduce its importance。 not to have conquered, but to have fought well. 2, the plain is the background of life. Live a plain life, give up on themselves is not a coward, but the wise answers。 【問(wèn)題 2】 （ 2 分） IPSec 支持傳輸和隧道兩種工作模式，如果要實(shí)現(xiàn) PC1 和 S1之間端到端的安全通信，則應(yīng)該采用 (4)模式。 option broadcastaddress (6) 。 (70) A. RMON 的管理信息庫(kù)提供整個(gè)子網(wǎng)的管理信息 B. RMON 的管理信息庫(kù)屬于 MIB2的一部分 C. RMON 監(jiān)視器可以對(duì)每個(gè)分組 進(jìn)行統(tǒng)計(jì)和分析 D. RMON 監(jiān)視器不包含 MIB2的功能 D ● The TCP protocolis a (71) layer protocol. Each connection connects two TCPs that may be just one physical work apart or located on opposite sides ofthe globe. In other words, each connection creates a (72) witha length that may be totally different from another path created by another connection. This means that TCP cannot use the same retransmission time for all connections. Selecting afixed retransnussion time for all connections can result in serious consequences. Ifthe retransmission time does not allow enough time for a (73) to reach the destination and an acknowledgment to reach the source, it can result in retransmission of segments that are still on the way. Conversely, if the retransnussion time is longer than necessary for a short path, it may result in delay for the application for one single connection, the retransmission time should not be connection may be able to send segments and receive (74)faster during nontraffic period than during congested periods. TCP uses the dynamic retransmission time,a transmission time is different for each connection and which may be changed during the same connection. Retransmission time can be made(75) by basing it on the roundtrip time (RTT). Several formulas are used for this purpose.(71) (72) (73) (74) (75) C,A,B,C,D 試題一（共 15 分）閱讀以下說(shuō)明，回答問(wèn)題 1 至問(wèn)題 3，將解答填入答題紙對(duì)應(yīng)的解答欄內(nèi)。 (54)A．網(wǎng)絡(luò)地址 B．組播地址 C．主機(jī)地址 D．定向廣播地址 (55)A．網(wǎng)絡(luò)地址 B．組播地址 C．主機(jī)地址 D．定向廣播地址 C,D ●某公司有 2020臺(tái)主機(jī)，則必須給它分配 (56)個(gè) C類(lèi)網(wǎng)絡(luò)。 (36) A ● DNS服務(wù)器中提供了多種資源記錄，其中 (37)定義了區(qū)域的郵件服務(wù)器及其優(yōu)先級(jí)。 (13) (14) B,A ●設(shè)信道帶寬為 3400HZ，采用 PCM編碼，采樣周期為 125μ s，每個(gè)樣本量化為 256個(gè)等級(jí)，則信道的數(shù)據(jù)速率為 (15)。 (1)A．硬件 B．軟件 C．用戶 D．程序員 A ●內(nèi)存單元按字節(jié)編址，地址 0000A000H～ 0000BFFFH 共有 (2)個(gè)存儲(chǔ)單元。 ARP請(qǐng)求是采用 (20)方式發(fā)送的。 (40) users A ● 支持的身份驗(yàn)證安全機(jī)制有 4 種驗(yàn)證方法， 其中安全級(jí)別最高的驗(yàn)證方法是(41)。 (58) . A ● IPv6地址分為 3種類(lèi)型，它們是 (59)。 2． 設(shè)計(jì)中心由于業(yè)務(wù)需求，要求千兆到桌面；同時(shí)要求設(shè)計(jì)中心匯聚交換機(jī)到核心交換機(jī)以千兆鏈路聚合。 (9) pcl{hardwa