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软工计网资料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料料
<link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/css/base.min.css" rel="stylesheet"/><link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/css/fancy.min.css" rel="stylesheet"/><link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/89569891/raw.css" rel="stylesheet"/><div id="sidebar" style="display: none"><div id="outline"></div></div><div class="pf w0 h0" data-page-no="1" id="pf1"><div class="pc pc1 w0 h0"><img alt="" class="bi x0 y0 w1 h1" src="/image.php?url=https://csdnimg.cn/release/download_crawler_static/89569891/bg1.jpg"/><div class="c x1 y1 w2 h2"><div class="t m0 x0 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">第<span class="ff2 sc1">1</span>页<span class="ff2 sc1"> <span class="_"> </span></span>共<span class="ff2 sc1"> <span class="_"> </span><span class="ls1 ws1">10</span> <span class="_"> </span></span>页<span class="ff3 sc1"><span class="fc2 sc1"> </span></span></div></div><div class="t m0 x2 h4 y3 ff4 fs1 fc0 sc0 ls2 ws2">西安电子科技大学</div><div class="t m0 x3 h5 y4 ff4 fs2 fc0 sc0 ls3 ws3">考试时间<span class="ff2 sc1 ls0 ws4"> 120 </span><span class="ls0 ws0">分钟<span class="ff2 sc1"> </span></span></div><div class="t m0 x4 h6 y5 ff1 fs3 fc0 sc0 ls0 ws0">试<span class="_ _0"> </span>题</div><div class="c x5 y6 w3 h7"><div class="t m0 x6 h5 y7 ff1 fs2 fc0 sc0 ls3 ws3">题号</div></div><div class="c x7 y6 w4 h7"><div class="t m0 x8 h5 y8 ff1 fs2 fc0 sc0 ls0 ws0">一</div><div class="t m0 x9 h8 y9 ff1 fs4 fc0 sc0 ls0 ws0">选择题</div></div><div class="c xa ya w5 h9"><div class="t m0 xb h5 yb ff1 fs2 fc0 sc0 ls0 ws0">二、计算和应<span class="_ _1"></span>用题</div></div><div class="c xc ya w6 h9"><div class="t m0 xd h5 yb ff1 fs2 fc0 sc0 ls3 ws3">总分</div></div><div class="c xa y6 w7 h9"><div class="t m0 xe ha yb ff2 fs2 fc0 sc1 ls0 ws0">1 </div></div><div class="c xf y6 w8 h9"><div class="t m0 x10 ha yb ff2 fs2 fc0 sc1 ls0 ws0">2 </div></div><div class="c x11 y6 w9 h9"><div class="t m0 x10 ha yb ff2 fs2 fc0 sc1 ls0 ws0">3 </div></div><div class="c x12 y6 wa h9"><div class="t m0 x10 ha yb ff2 fs2 fc0 sc1 ls0 ws0">4 </div></div><div class="c x13 y6 wb h9"><div class="t m0 x14 ha yb ff2 fs2 fc0 sc1 ls0 ws0">5 </div></div><div class="c x15 y6 wc h9"><div class="t m0 x14 ha yb ff2 fs2 fc0 sc1 ls0 ws0">6 </div></div><div class="c x5 yc w3 hb"><div class="t m0 x6 h5 yd ff1 fs2 fc0 sc0 ls3 ws3">分数</div></div><div class="t m0 x16 h8 ye ff2 fs4 fc0 sc1 ls0 ws0">1.<span class="ff1 sc0">考试形式：闭卷<span class="ff5"></span></span><span class="ws5"> </span><span class="ff1 sc0">开卷</span> <span class="_"> </span><span class="ff1 sc0">；<span class="_ _2"> </span></span>2.<span class="ff1 sc0">本试卷共二大题，满分<span class="_ _3"> </span></span><span class="ls4 ws6">100<span class="_"> </span></span><span class="ff1 sc0">分；</span></div><div class="t m0 x16 hc yf ff2 fs4 fc0 sc1 ls0 ws0">3.</div><div class="t m0 x17 h8 y10 ff1 fs4 fc0 sc0 ls0 ws0">考试日期：<span class="ff2 sc1"> <span class="_"> </span><span class="ls4 ws6">202<span class="_ _1"></span></span>2 <span class="_"> </span></span>年<span class="_ _4"> </span>月<span class="_ _4"> </span>日；<span class="_ _1"></span><span class="ff2 sc1 ws7"> <span class="ws0">(<span class="_ _5"></span><span class="ff1 sc0">答题内容请写在装订线外<span class="ff2 sc1">) </span></span></span></span></div><div class="t m0 x18 hd y11 ff2 fs2 fc0 sc1 ls0 ws0">I.<span class="_"> </span><span class="ff6 sc0 ls5 ws8">单选题</span><span class="ff7 sc0">（</span>1.5 <span class="ff6 sc0">分每个，共计</span> 30 <span class="ff6 sc0">分<span class="ff7">）</span></span></div><div class="t m0 x19 hc y12 ff2 fs4 fc0 sc1 ls6 ws9">1.<span class="_"> </span>In<span class="wsa"> t</span>he<span class="ls0 wsb"> <span class="ls7 wsc">following<span class="wsd"> d</span>escri<span class="_ _5"></span>ption<span class="wse"> o</span>f<span class="wsf"> t</span>h<span class="_ _5"></span><span class="ws10">e <span class="wsc">functions<span class="ws11"> o</span>f<span class="ws12"> </span>each<span class="wse"> O</span>SI<span class="ws13"> l</span>ayer<span class="_ _6"></span>,<span class="ws14"> t</span>he <span class="ws15">INcor<span class="_ _5"></span>r<span class="_ _5"></span>ect<span class="ls0 ws16"> <span class="ls6 ws17">statement</span></span></span></span></span></span></span></div><div class="t m0 x19 hc y13 ff2 fs4 fc0 sc1 ls8 ws18">is<span class="ls0 ws7"> <span class="_ _7"> </span><span class="ws0">. </span></span></div><div class="t m0 x19 hc y14 ff8 fs4 fc0 sc1 ls6 ws17">A.<span class="_ _3"> </span><span class="ff2">The<span class="ws19"> p</span>hysical<span class="ws1a"> l</span>ayer<span class="ws1b"> u</span>ses the<span class="ws19"> tr</span>ansmission<span class="ws1c"> m</span>edium<span class="ws1d"> to<span class="ws1e"> t</span></span>ransmit bit sequence.</span></div><div class="t m0 x1a hc y15 ff8 fs4 fc0 sc1 ls6 ws15">B.<span class="_ _3"> </span><span class="ff2 ls7">The data</span></div><div class="t m0 x1b hc y16 ff2 fs4 fc0 sc1 ls7 ws1f"> l<span class="ws15">ink<span class="ws20"> </span>layer<span class="ws21"> m</span>akes<span class="ws22"> t</span>he error<span class="ws23"> p</span>hysical<span class="ws24"> l</span>ine into<span class="ws25"> a</span>n<span class="ws26"> err</span>or<span class="ws27"> </span>free data<span class="ws25"> l</span>ink.</span></div><div class="t m0 x19 hc y17 ff8 fs4 fc0 sc1 ls6 ws0">C.<span class="_ _3"> </span><span class="ff2 fc1 ls0">The <span class="ws28">network <span class="ws29">layer <span class="ws2a">has <span class="ws2b">the <span class="ws2c">functions </span></span></span></span></span>of <span class="ws2d">routing, <span class="_ _5"></span><span class="ws0">packet <span class="ws2e">forwarding, error <span class="ws2f">control <span class="ws30">and <span class="ws31">so </span></span></span></span>on.</span></span></span></div><div class="t m0 x19 hc y18 ff8 fs4 fc0 sc1 ls6 ws15">D.<span class="_ _3"> </span><span class="ff2 ls7">The transport<span class="ws32"> l</span>ayer<span class="ws27"> </span>provides<span class="ws33"> r</span>eliable "end<span class="ls0 ws0">-t<span class="ls6 ws17">o</span>-e</span>nd"<span class="ws34"> co</span>mmunication<span class="ws26"> s</span>ervices.</span></div><div class="t m0 x19 hc y19 ff2 fs4 fc0 sc1 ls0 ws0">2.<span class="_ _8"> </span><span class="ls9 ws35">For<span class="_ _5"></span> a ba<span class="_ _5"></span>ndpass<span class="_ _5"></span> signal <span class="_ _5"></span>with a<span class="_ _5"></span> band<span class="_ _5"></span>width o<span class="_ _5"></span>f 100k<span class="_ _5"></span>Hz and a<span class="_ _5"></span> m<span class="_ _5"></span>inim<span class="_ _5"></span>um fr<span class="_ _5"></span>equency o<span class="_ _5"></span>f 150<span class="_ _5"></span>kH<span class="_ _5"></span><span class="ls4 ws6">z,</span></span></div><div class="t m0 x19 hc y1a ff2 fs4 fc0 sc1 ls8 ws18">which<span class="_ _1"></span> o<span class="_ _5"></span>f the f<span class="_ _1"></span>ollowing is its N<span class="_ _1"></span>yquist sampling ra<span class="_ _1"></span>te?<span class="ls0 ws0"> </span></div><div class="t m0 x19 hc y1b ff2 fs4 fc0 sc1 ls0 ws0">A.<span class="_"> </span>200k<span class="_ _5"></span> sampl<span class="_ _5"></span>es/s<span class="_ _9"> </span>B.<span class="_"> </span>300k<span class="_ _5"></span> samples/<span class="_ _5"></span>s<span class="_ _a"> </span>C.<span class="_"> </span>400k<span class="_ _5"></span> sampl<span class="_ _5"></span>es/s<span class="_ _b"> </span><span class="fc1">D.<span class="_"> </span>500k <span class="ws29">samples/s</span></span></div><div class="t m0 x19 hc y1c ff2 fs4 fc0 sc1 ls0 ws36">3.<span class="_"> </span>The <span class="_ _1"></span><span class="lsa ws37">INco<span class="_ _5"></span>rrect<span class="ls0 ws0"> <span class="ls8 ws18">statement in the follow<span class="_ _1"></span>ing descrip<span class="_ _1"></span>tion is<span class="_ _2"> </span></span>. </span></span></div><div class="t m0 x1c hc y1d ff2 fs4 fc0 sc1 ls9 ws38">A.<span class="_"> </span>T<span class="_ _6"></span>ransmission ra<span class="_ _5"></span>te r<span class="_ _5"></span>efe<span class="_ _5"></span>rs to the<span class="_ _5"></span> number<span class="_ _5"></span> o<span class="_ _5"></span>f bina<span class="lsb ws39">r<span class="_ _5"></span>y bits that the transmission system can</span></div><div class="t m0 x1c hc y1e ff2 fs4 fc0 sc1 lsb ws3a">transmit per second.<span class="ls0 ws0"> </span></div><div class="t m0 x1c hc y1f ff2 fs4 fc0 sc1 lsb ws3b">B.<span class="_"> </span>T<span class="_ _c"></span>ransmission rate is one of the important technical <span class="lsa ws37">parameters<span class="ls0 ws0"> <span class="_ _d"> </span></span><span class="ws3c">to describe data</span></span></div><div class="t m0 x1c hc y20 ff2 fs4 fc0 sc1 lsb ws3a">transmission system.<span class="ls0 ws0"> </span></div><div class="t m0 x1c hc y21 ff9 fs4 fc1 sc1 ls0 ws2c">C.<span class="_ _3"> </span><span class="ff2">The <span class="ws24">unit <span class="ws2e">of <span class="ws3d">propagation <span class="ws3e">rate <span class="ws3f">is <span class="ws2b">bit/s.</span></span></span></span></span></span></span></div><div class="c x1d y22 wd he"><div class="t m1 x1e h8 y23 ff1 fs4 fc0 sc0 ls0 ws0">班级：<span class="_ _e"> </span>姓名：<span class="_ _f"> </span>学号：<span class="_ _f"> </span>任课教师：</div><div class="t m1 x1f h8 y24 ff1 fs4 fc0 sc0 ls0 ws0">装</div></div><div class="t m1 x20 hc y25 ff2 fs4 fc0 sc1 ls0 ws7"> </div><div class="c x1d y22 wd he"><div class="t m1 x1f h8 y26 ff1 fs4 fc0 sc0 ls0 ws0">订</div></div><div class="t m1 x20 hc y27 ff2 fs4 fc0 sc1 ls0 ws7"> </div><div class="c x1d y22 wd he"><div class="t m1 x1f h8 y28 ff1 fs4 fc0 sc0 ls0 ws0">线<span class="_ _10"> </span>装</div></div><div class="t m1 x20 hc y29 ff2 fs4 fc0 sc1 ls0 ws7"> </div><div class="c x1d y22 wd he"><div class="t m1 x1f h8 y2a ff1 fs4 fc0 sc0 ls0 ws0">订</div></div><div class="t m1 x20 hc y2b ff2 fs4 fc0 sc1 ls0 ws7"> </div><div class="c x1d y22 wd he"><div class="t m1 x1f h8 y2c ff1 fs4 fc0 sc0 ls0 ws0">线<span class="_ _11"> </span>装</div></div><div class="t m1 x20 hc y2d ff2 fs4 fc0 sc1 ls0 ws7"> </div><div class="c x1d y22 wd he"><div class="t m1 x1f h8 y2e ff1 fs4 fc0 sc0 ls0 ws0">订</div></div><div class="t m1 x20 hc y2f ff2 fs4 fc0 sc1 ls0 ws7"> </div><div class="c x1d y22 wd he"><div class="t m1 x1f h8 y30 ff1 fs4 fc0 sc0 ls0 ws0">线</div></div><div class="t m0 x21 hc y31 ffa fs4 fc0 sc1 ls0 ws0">D.<span class="_"> </span>The propagation rate is related to distance.</div></div><div class="pi" data-data='{"ctm":[1.736488,0.000000,0.000000,1.736488,0.000000,0.000000]}'></div></div><div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="/image.php?url=https://csdnimg.cn/release/download_crawler_static/89569891/bg2.jpg"><div class="c x1 y1 w2 h2"><div class="t m0 x0 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">&#31532;<span class="ff2 sc1">2</span>&#39029;<span class="ff2 sc1"> <span class="_"> </span></span>&#20849;<span class="ff2 sc1"> <span class="_"> </span><span class="ls1 ws1">10</span> <span class="_"> </span></span>&#39029;<span class="ff3 sc1"><span class="fc2 sc1"> </span></span></div></div><div class="t m0 x18 hc y32 ff2 fs4 fc0 sc1 ls0 ws0">4.<span class="_"> </span><span class="ls9 ws40">A<span class="_ _1"></span>n anal<span class="_ _5"></span>og data enc<span class="_ _5"></span>oding<span class="_ _5"></span> met<span class="_ _5"></span>hod that r<span class="_ _5"></span>epr<span class="_ _5"></span>esent<span class="_ _5"></span>s number<span class="_ _c"></span> 0 and 1 by changing the am<span class="_ _5"></span>plit<span class="_ _5"></span>ude</span></div><div class="t m0 x18 hc y33 ff2 fs4 fc0 sc1 lsa ws37">of the carrier<span class="_ _5"></span> signal i<span class="_ _5"></span>s called<span class="ls0 ws7"> <span class="_"> </span><span class="ws0">. </span></span></div><div class="t m0 x18 hc y34 ff2 fs4 fc1 sc1 lsc ws41">A.<span class="ws42"> AS</span>K<span class="_ _12"> </span><span class="fc0 ls0 ws43">B.<span class="_"> </span>FSK<span class="_ _13"> </span>C.<span class="_"> </span>PSK<span class="_ _14"> </span><span class="lsd ws44">D.<span class="_"> </span>PCM</span></span></div><div class="t m0 x18 hc y35 ff2 fs4 fc0 sc1 lsb ws3a">5.<span class="_"> </span>Which of the following addr<span class="_ _5"></span>esses is a multicast addr<span class="_ _5"></span>ess?</div><div class="t m0 x18 hc y36 ff2 fs4 fc0 sc1 ls0 ws0">A.<span class="_"> </span>10.2.3.4<span class="_ _15"> </span>B.<span class="_"> </span>202.38.214.<span class="_ _5"></span>2<span class="_ _16"> </span><span class="ws43">C.<span class="_"> </span>192.168.215.6<span class="_ _17"> </span><span class="fc1 ws3">D.<span class="_"> </span><span class="ws0">224.38.26.9</span></span></span></div><div class="t m0 x18 hc y37 ff2 fs4 fc0 sc1 ls0 ws0">6.<span class="_"> </span>Whi<span class="_ _5"></span>ch of the <span class="_ _5"></span>following st<span class="_ _5"></span>atem<span class="_ _5"></span>ents is <span class="lsb ws3a">IN<span class="lsa ws37">corr<span class="_ _5"></span>ect?</span></span></div><div class="t m0 x18 hc y38 ff2 fs4 fc0 sc1 ls0 ws0">A.<span class="_"> </span>OSPF<span class="_ _c"></span> protoc<span class="_ _5"></span>ol is an intr<span class="_ _5"></span>a domai<span class="_ _5"></span>n r<span class="_ _5"></span>outing pr<span class="_ _5"></span>otocol<span class="_ _5"></span>.</div><div class="t m0 x18 hc y39 ff2 fs4 fc0 sc1 ls0 ws45">B.<span class="_"> </span>The cor<span class="_ _5"></span>e functi<span class="_ _5"></span>on of O<span class="_ _5"></span>SPF<span class="_ _5"></span> pr<span class="_ _5"></span>otocol i<span class="_ _5"></span>s the networ<span class="_ _5"></span>k topology dat<span class="_ _5"></span>abase, <span class="_ _5"></span>which gen<span class="lsb ws46">erates the</span></div><div class="t m0 x18 hc y3a ff2 fs4 fc0 sc1 ls0 ws0">rout<span class="_ _5"></span>ing table.<span class="_ _5"></span> </div><div class="t m0 x18 hc y3b ffb fs4 fc1 sc1 ls0 ws0">C.<span class="_ _3"> </span><span class="ff2">OSPF <span class="ws47">is <span class="ws2b">an <span class="ws31">inter <span class="ws2f">domain </span>routing protocol.</span></span></span></span></div><div class="t m0 x18 hc y3c ff2 fs4 fc0 sc1 ls8 ws48">7.<span class="_"> </span>Whic<span class="_ _1"></span>h of the follow<span class="_ _1"></span>ing field<span class="_ _1"></span>s is <span class="lsd ws49">UN<span class="ls0 ws4a">r<span class="_ _5"></span>elated to <span class="_ _5"></span>fragment<span class="_ _5"></span>ation and r<span class="_ _5"></span>eorganizat<span class="_ _5"></span>ion of IP</span></span></div><div class="t m0 x18 hc y3d ff2 fs4 fc0 sc1 lsb ws3a">packets? <span class="_ _18"> </span><span class="fc3 ls0 ws0">.<span class="fc0"> </span></span></div><div class="t m0 x18 hc y3e ff2 fs4 fc0 sc1 ls8 ws18">A.<span class="_"> </span>Ident<span class="_ _1"></span>ification<span class="_ _19"> </span><span class="ls0 ws43">B.<span class="_"> </span>F<span class="ws0">lags<span class="_ _1a"> </span></span>C.<span class="_"> </span>Fragmentation o<span class="_ _5"></span>ffset<span class="_ _1b"> </span><span class="fc1 lse ws1">D.<span class="_"> </span>Surviva<span class="ws4b">l t</span>ime</span></span></div><div class="t m0 x18 hc y3f ff2 fs4 fc0 sc1 ls9 ws4c">8.<span class="_"> </span>The appli<span class="_ _5"></span>cation PI<span class="_ _5"></span>NG<span class="_ _c"></span> <span class="_ _1"></span>sends<span class="_ _1c"> </span><span class="lsb ws3a">message.<span class="ls0 ws0"> </span></span></div><div class="t m0 x18 hc y40 ff2 fs4 fc0 sc1 lsa ws4d">A.<span class="_"> </span>TCP<span class="_ _c"></span> <span class="_ _1"></span>r<span class="_ _5"></span>equest<span class="_ _1d"> </span><span class="ls0 ws36">B.<span class="_"> </span>TCP<span class="_ _c"></span> <span class="_ _1"></span>r<span class="_ _5"></span>esponse<span class="_ _1e"> </span><span class="fc1 ls7 ws15">C.<span class="_"> </span>ICMP<span class="ws4e"> r</span>equest<span class="_ _1f"> </span></span><span class="lsf ws4f">D.<span class="_ _20"> </span>ICMP r<span class="_ _5"></span>esp<span class="_ _1"></span>on<span class="_ _1"></span>se</span></span></div><div class="t m0 x18 hc y41 ff2 fs4 fc0 sc1 ls0 ws50">9.<span class="_"> </span>When a hos<span class="_ _5"></span>t moves <span class="_ _5"></span>fr<span class="_ _5"></span>om<span class="_ _5"></span> one network<span class="_ _5"></span> to another<span class="_ _5"></span> net<span class="_ _5"></span>work with a <span class="_ _5"></span>differ<span class="_ _5"></span>ent n<span class="_ _5"></span>etwork<span class="_ _5"></span> addr<span class="lsb ws3a">ess,</span></div><div class="t m0 x18 hc y42 ff2 fs4 fc0 sc1 lsb ws3a">which of the following statement is correct? </div><div class="t m0 x18 hc y43 ffc fs4 fc0 sc1 ls0 ws51">A.<span class="_ _3"> </span><span class="ff2 fc1">IP <span class="ws52">address <span class="ws53">will <span class="ws54">change.</span></span></span></span></div><div class="t m0 x22 hc y44 ffc fs4 fc0 sc1 ls0 ws55">B.<span class="_ _3"> </span><span class="ff2 ls10">MAC<span class="ws56"> ad</span>dress<span class="ws2d"> </span>will<span class="ws57"> c</span>hange.</span></div><div class="t m0 x18 hc y45 ffc fs4 fc0 sc1 ls0 ws58">C.<span class="_ _3"> </span><span class="ff2">Both <span class="ws59">IP <span class="ws5a">address <span class="ws5b">and <span class="ws5c">MAC <span class="ws5d">address <span class="ws5e">will <span class="ws5f">change.</span></span></span></span></span></span></span></span></div><div class="t m0 x18 hc y46 ffc fs4 fc0 sc1 ls0 ws60">D.<span class="_ _3"> </span><span class="ff2 ls11">Neither<span class="ws61"> </span>IP<span class="ws62"> a</span>ddress<span class="ws63"> no</span>r<span class="ws64"> M</span>AC<span class="ws65"> </span>address<span class="ws66"> w</span>ill</span></div><div class="t m0 x23 hc y47 ff2 fs4 fc0 sc1 ls11 ws60">change.</div><div class="t m0 x22 hc y48 ffd fs4 fc0 sc1 ls0 ws0">D.SPF uses flooding to spread link state packets.</div></div><div class="pi" data-data='{"ctm":[1.736488,0.000000,0.000000,1.736488,0.000000,0.000000]}'></div></div><div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="/image.php?url=https://csdnimg.cn/release/download_crawler_static/89569891/bg3.jpg"><div class="c x1 y1 w2 h2"><div class="t m0 x0 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">&#31532;<span class="ff2 sc1">3</span>&#39029;<span class="ff2 sc1"> <span class="_"> </span></span>&#20849;<span class="ff2 sc1"> <span class="_"> </span><span class="ls1 ws1">10</span> <span class="_"> </span></span>&#39029;<span class="ff3 sc1"><span class="fc2 sc1"> </span></span></div></div><div class="t m0 x24 hc y32 ff2 fs4 fc0 sc1 ls0 ws0">. </div><div class="t m0 x25 hc y49 ff2 fs4 fc0 sc1 ls0 ws0">B.<span class="_"> </span>res<span class="_ _5"></span>olving physi<span class="_ _5"></span>cal addr<span class="_ _5"></span>e<span class="_ _5"></span>ss to IP<span class="_ _c"></span> addr<span class="_ _5"></span>ess</div><div class="t m0 x25 hc y4a ff2 fs4 fc0 sc1 ls0 ws0">D.<span class="_"> </span>resol<span class="_ _5"></span>ving IP<span class="_ _c"></span> addr<span class="_ _c"></span>ess to host name</div><div class="t m0 x18 hc y4b ff2 fs4 fc0 sc1 ls0 ws67">10.<span class="_"> </span><span class="ws0">The <span class="ws68">main <span class="ws31">function of <span class="_ _c"></span><span class="ws0">ARP <span class="_ _c"></span>protocol <span class="ws5f">is</span></span></span></span></span></div><div class="t m0 x18 hc y4c ff2 fs4 fc1 sc1 ls0 ws0">A.<span class="_"> </span>resolving IP <span class="_ _c"></span><span class="ws69">address <span class="_ _21"></span><span class="ws2b">to physical <span class="ws5f">address</span></span></span></div><div class="t m0 x18 hc y4d ffe fs4 fc0 sc1 ls7 ws15">A.<span class="_ _3"> </span><span class="ff2">IP<span class="ws6a"> </span>packets<span class="ws33"> ca</span>n<span class="ws6b"> b<span class="ws3d">e </span></span>fragmented<span class="ws26"> b</span>y<span class="ws6c"> t</span>he source host<span class="ws6d"> </span>and<span class="ws26"> r</span>eorganized<span class="ws26"> b</span>y<span class="ws25"> r</span>outers.</span></div><div class="t m0 x22 hc y4e ffe fs4 fc0 sc1 ls7 ws15">B.<span class="_ _3"> </span><span class="ff2 fc1">IP<span class="ws6e"> </span>packets<span class="ws22"> ca</span></span></div><div class="t m0 x26 hc y4f ff2 fs4 fc1 sc1 ls7 ws15">n<span class="ws6b"> b<span class="ws3d">e </span></span>fragmented<span class="ws26"> b</span>y<span class="ws25"> r</span>outers<span class="ws33"> a</span>nd<span class="ws26"> r</span>eorganized<span class="ws26"> b</span>y<span class="ws25"> t</span>h<span class="ws3d">e </span>destination<span class="ws26"> h</span>ost.</div><div class="t m0 x18 hc y50 ffe fs4 fc0 sc1 ls7 ws15">C.<span class="_ _3"> </span><span class="ff2">IP<span class="ws6a"> </span>packets<span class="ws33"> ca</span>n<span class="ws6b"> b<span class="ws3d">e </span></span>fragmented<span class="ws26"> a</span>nd<span class="ws6b"> r</span>eorganized<span class="ws20"> b</span>y<span class="ws25"> i</span>ntermediate routers.</span></div><div class="t m0 x18 hc y51 ffe fs4 fc0 sc1 ls7 ws15">D.<span class="_ _3"> </span><span class="ff2">IP<span class="ws6a"> </span>packets<span class="ws33"> ca</span>n<span class="ws26"> b<span class="ws3d">e </span></span>fragmented<span class="ws26"> b</span>y<span class="ws25"> i</span>ntermediate routers<span class="ws22"> a</span>nd<span class="ws26"> r</span>eorganized<span class="ws6b"> b</span>y<span class="ws25"> t</span>h<span class="ws3d">e </span>last<span class="ws32"> r</span>oute<span class="ls12">r</span>.</span></div><div class="t m0 x18 hc y52 ff2 fs4 fc0 sc1 ls9 ws6f">12.<span class="_"> </span>A<span class="_ _c"></span> depart<span class="_ _5"></span>ment a<span class="_ _5"></span>pplied <span class="_ _5"></span>for<span class="_ _5"></span> a clas<span class="_ _5"></span>s C<span class="_ _5"></span> addr<span class="_ _5"></span>ess t<span class="_ _5"></span>o divi<span class="_ _5"></span>de into<span class="_ _5"></span> 16 subn<span class="_ _5"></span>ets <span class="_ _5"></span>with the<span class="_ _5"></span> same num<span class="_ _5"></span>be<span class="_ _5"></span>r</div><div class="t m0 x18 hc y53 ff2 fs4 fc0 sc1 ls9 ws70">of addr<span class="_ _5"></span>esses. <span class="_ _c"></span>The subnet m<span class="_ _5"></span>ask<span class="_ _5"></span> should be </div><div class="t m0 x18 hc y54 ff2 fs4 fc0 sc1 ls0 ws0">A.<span class="_"> </span>255.255.25<span class="_ _5"></span>5.0<span class="_ _19"> </span>B.<span class="_"> </span>255.255.255.<span class="_ _5"></span>192</div><div class="t m0 x27 hc y55 ff2 fs4 fc0 sc1 ls0 ws0">. </div><div class="t m0 x28 hc y54 ff2 fs4 fc1 sc1 ls0 ws0">C.<span class="_"> </span>255.255.255.240<span class="_ _4"> </span><span class="fc0">D.<span class="_"> </span>255.255.25<span class="_ _5"></span>5.255</span></div><div class="t m0 x18 hc y3c ff2 fs4 fc0 sc1 ls0 ws71">13.<span class="_"> </span>A<span class="_ _c"></span> TCP<span class="_ _c"></span> connecti<span class="_ _5"></span>on has<span class="_ _5"></span> established bet<span class="_ _5"></span>ween hos<span class="_ _5"></span>t A<span class="_ _c"></span> and host B. H<span class="_ _5"></span>ost A<span class="_ _c"></span> sends t<span class="_ _5"></span>wo TCP</div><div class="t m0 x18 hc y3d ff2 fs4 fc0 sc1 ls0 ws72">segments<span class="_ _5"></span> to host B, including 400 bytes<span class="_ _5"></span> and 500 b<span class="_ _5"></span>ytes of data r<span class="_ _5"></span>espect<span class="_ _5"></span>ively<span class="_ _c"></span>. The sequence<span class="_ _5"></span> </div><div class="t m0 x18 hc y56 ff2 fs4 fc0 sc1 lsa ws73">number<span class="_ _5"></span> of the <span class="_ _5"></span>first segme<span class="_ _5"></span>nt is 300. H<span class="_ _5"></span>ost B corr<span class="_ _c"></span>ectly received<span class="_ _5"></span> the t<span class="_ _5"></span>wo <span class="lsb ws74">segments and sends the<span class="_ _5"></span> </span></div><div class="t m0 x18 hc y57 ff2 fs4 fc0 sc1 ls9 ws70">ack<span class="_ _5"></span>nowledgme<span class="_ _5"></span>nt to host <span class="_ _6"></span>A<span class="_ _1"></span>, and t<span class="_ _5"></span>he ack<span class="_ _c"></span>now<span class="_ _1"></span>ledgm<span class="_ _5"></span>ent <span class="_ _5"></span>number<span class="_ _c"></span> is <span class="_"> </span><span class="ls0 ws7"> <span class="ws0"> <span class="_"> </span>. </span></span></div><div class="t m0 x18 hc y3f ff2 fs4 fc0 sc1 ls0 ws0">A.<span class="_"> </span>700<span class="_ _22"> </span>B.<span class="_"> </span>800<span class="_ _23"> </span>C.<span class="_"> </span>900<span class="_ _22"> </span><span class="fc1">D.<span class="_"> </span>1200</span></div><div class="t m0 x18 hc y58 ff2 fs4 fc0 sc1 ls0 ws0">14<span class="lsb ws75">.<span class="_"> </span>Host A<span class="_ _c"></span> expects to establish a TCP<span class="_ _c"></span> connection with host B by sending a TCP<span class="_ _c"></span> segment</span></div><div class="t m0 x18 hc y59 ff2 fs4 fc0 sc1 lsb ws76">(SYN=1, seq=2021). If host B accepts the<span class="ls0 ws0"> <span class="_ _21"></span><span class="ls4 ws77">c<span class="_ _1"></span>onne<span class="_ _1"></span>ctio<span class="_ _1"></span>n reque<span class="_ _1"></span>st, wh<span class="_ _1"></span>ich of<span class="_ _1"></span> the fo<span class="_ _1"></span>llow<span class="_ _1"></span>ing cou<span class="_ _1"></span>ld be </span></span></div><div class="t m0 x18 hc y5a ff2 fs4 fc0 sc1 lsb ws3a">the correct <span class="_ _5"></span>TCP<span class="_ _c"></span> when host B sending back to host <span class="_ _c"></span>A? </div><div class="t m0 x18 hc y5b fff fs4 fc0 sc1 ls0 ws0">A.<span class="_ _3"> </span><span class="ff2">SYN=0, <span class="_ _5"></span>ACK=0, seq=1234, ack=2022</span></div><div class="t m0 x22 hc y5c fff fs4 fc0 sc1 ls0 ws0">B.<span class="_ _3"> </span><span class="ff2 fc1">SYN=1, <span class="_ _c"></span>ACK=1, seq=24689, ack=2022</span></div><div class="t m0 x18 hc y5d fff fs4 fc0 sc1 ls0 ws0">C.<span class="_ _3"> </span><span class="ff2">SYN=1, <span class="_ _5"></span>ACK=1, seq=12340, ack=2021</span></div><div class="t m0 x18 hc y5e fff fs4 fc0 sc1 ls0 ws0">D.<span class="_ _3"> </span><span class="ff2">SYN=1, <span class="_ _5"></span>ACK=0, seq=8734, ack=2021</span></div><div class="t m0 x18 hc y5f ff10 fs4 fc0 sc1 ls0 ws0">C.<span class="_"> </span>resolving host name to IP address</div><div class="t m0 x22 hc y60 ff11 fs4 fc0 sc1 ls7 ws0">1</div><div class="t m0 x29 hc y61 ff11 fs4 fc0 sc1 ls7 ws0">1</div><div class="t m0 x2a hc y60 ff11 fs4 fc0 sc1 ls7 ws0">.<span class="_"> </span>Which of the following statement is correct?</div></div><div class="pi" data-data='{"ctm":[1.736488,0.000000,0.000000,1.736488,0.000000,0.000000]}'></div></div>
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