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📄 200401_wlgcs_1.htm

📁 参加全国网络工程师考试的参考资料
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</span><span class=GramE>　　　　</span><span lang=EN-US>C</span>．可访问到的<span
lang=EN-US>DHCP</span>主机　　<span class=GramE>　</span><span lang=EN-US> D</span>．专用的服务器<span
lang=EN-US><br>
</span>　　<span lang=EN-US>(28)A</span>．自动分配　<span lang=EN-US>B</span>．动态分配　　<span
lang=EN-US>C</span>．人工分配　　<span lang=EN-US>D</span>．静态分配<span lang=EN-US><br>
</span>　　<span lang=EN-US>(29)A</span>．借用别人的<span lang=EN-US>p</span>地址<span
class=GramE>　　　　　　</span><span lang=EN-US> B</span>．任意选取一个<span lang=EN-US>IP</span>地址<span
lang=EN-US><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>C</span>．在特定网段中选取一个<span
lang=EN-US>IP</span>地址　<span lang=EN-US>D</span>．不使用<span lang=EN-US>IP</span>地址<span
lang=EN-US><br>
</span>　　<span lang=EN-US>(30)A</span>．<span lang=EN-US>TCP</span>　　<span
class=GramE>　</span><span lang=EN-US> B</span>．<span lang=EN-US>UDP</span><span
class=GramE>　　　　</span><span lang=EN-US> C</span>．<span lang=EN-US>IP</span><span
class=GramE>　　　　　</span><span lang=EN-US>D</span>．<span lang=EN-US>ARP <o:p></o:p></span></span></p>

<p><span style='font-size:10.5pt;color:black'>　　<span lang=EN-US>●RSA</span>是一种<span
class=GramE>基于<span lang=EN-US>__(</span></span><span lang=EN-US>31)__</span>原理的公<span
class=GramE>钥</span>加密算法。网络上广泛使用的<span lang=EN-US>PGP</span>协议采用<span
lang=EN-US>RSA</span>和<span lang=EN-US>IDEA</span>两种加密算法组成链式加密体系，这种方案的优点是<span
lang=EN-US>__(32)__POP</span>还可以对电子邮件进行认证，认证机制是用<span lang=EN-US>MD5</span>算法产生<span
lang=EN-US>__(33)__</span>位的报文摘要，发送方用自己的<span lang=EN-US>RSA</span>私<span
class=GramE>钥</span>对<span lang=EN-US>__(34)__</span>进行加密，附加在邮件中进行传送。如果发送方要向一个陌生人发送保密信息，又没有对方的公<span
class=GramE>钥</span>，那么他可以<span lang=EN-US>__(35)__</span>。<span lang=EN-US><br>
</span>　　<span lang=EN-US>(31)A</span>．大素数分解　<span lang=EN-US> B</span>．椭圆曲线　<span
lang=EN-US>C</span>．背包问题　　<span lang=EN-US> D</span>．离散对数<span lang=EN-US><br>
</span>　　<span lang=EN-US>(32)A</span>．两种算法互相取长补短，从而提高了信息的保密性<span lang=EN-US><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>B</span>．可以组合成一种新的加密算法，从而避免专利技术的困扰<span
lang=EN-US><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>C</span>．既有<span
lang=EN-US>RSA</span>体系的快捷性，又有<span lang=EN-US>IDEA</span>算法的保密性<span
lang=EN-US><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>D</span>．既有<span
lang=EN-US>RSA</span>体系的保密性，又有<span lang=EN-US>IDEA</span>算法的快捷性<span
lang=EN-US><br>
</span>　　<span lang=EN-US>(33)A</span>．<span lang=EN-US>256</span><span
class=GramE>　　　　　</span><span lang=EN-US>B</span>．<span lang=EN-US>160</span>　　<span
class=GramE>　</span><span lang=EN-US> C</span>．<span lang=EN-US>128</span><span
class=GramE>　　　　　</span><span lang=EN-US>D</span>．<span lang=EN-US>96<br>
</span>　　<span lang=EN-US>(34)A</span>．邮件明文　　<span lang=EN-US> B</span>．<span
lang=EN-US>IDEA</span>密钥　<span lang=EN-US>C</span>．邮件明文和报文摘要　<span lang=EN-US>
D</span>．报文摘要<span lang=EN-US><br>
</span>　　<span lang=EN-US>(35)A</span>．向对方打电话索取公<span class=GramE>钥</span>　　<span
class=GramE>　</span><span lang=EN-US>B</span>．从权威认证机构获取对方的公<span class=GramE>钥</span><span
lang=EN-US><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>C</span>．制造一个公<span
class=GramE>钥</span>发给对方　　<span class=GramE>　</span><span lang=EN-US>D</span>．向对方发一个明文索取公<span
class=GramE>钥</span><span lang=EN-US> <o:p></o:p></span></span></p>

<p><span style='font-size:10.5pt;color:black'>　　<span lang=EN-US>●SNMPv1</span>是一个不安全的协议，管理站<span
lang=EN-US>(Manager)</span>与代理<span lang=EN-US>(Agent)</span>之间通过<span
lang=EN-US>__(36)__</span>进行身份认证，由于认证信息没有加密，所以是不安全的。<span lang=EN-US>1998</span>年公布的<span
lang=EN-US>SNMPv3</span>定义了基于用户的安全模型<span lang=EN-US>USM</span>，其中的认证模块结合<span
lang=EN-US>__(37)__</span>算法形成认证协议，产生一个<span lang=EN-US>96</span>位的报文摘要。<span
lang=EN-US>SNMPv3</span>还定义了基于视图的访问控制模型<span lang=EN-US>VACM</span>。在这个模型中，用户被分成组，属于同一组的用户可以有不同的安全级别，其中<span
lang=EN-US>__(38)__</span>是最高安全级别。<span lang=EN-US>RPC1757</span>定义的<span
lang=EN-US>RMON</span>管理信息库是对<span lang=EN-US>MIB-2</span>的扩充，其中的统计<span
class=GramE>组记录</span><span lang=EN-US>__(39)__</span>的管理信息，而矩阵组则记录<span
lang=EN-US>__(40)__</span>的通信情况。</span><span lang=EN-US style='mso-bidi-font-size:
10.5pt;color:white'>(</span><span style='mso-bidi-font-size:10.5pt;color:white'>此括号内不是试题部分。欢迎访问软件考试网<span
lang=EN-US>www.hbsoft.net)</span></span><span lang=EN-US style='font-size:10.5pt;
color:black'><br>
</span><span style='font-size:10.5pt;color:black'>　　<span lang=EN-US>(36)A</span>．团体名　　<span
class=GramE>　</span><span lang=EN-US> B</span>．用户名<span lang=EN-US>ID</span>　<span
lang=EN-US> C</span>．访问权限　　<span lang=EN-US> D</span>．访问控制<span lang=EN-US><br>
</span>　　<span lang=EN-US>(37)A</span>．<span lang=EN-US>RC6</span>和<span
lang=EN-US>SHA</span>　　<span lang=EN-US> B</span>．<span lang=EN-US>RC6</span>和<span
lang=EN-US>MD4</span>　<span lang=EN-US> C</span>．<span lang=EN-US>MD5</span>和<span
lang=EN-US>RC6</span>　　<span lang=EN-US> D</span>．<span lang=EN-US>MD5</span>和<span
lang=EN-US>SHA<br>
</span>　　<span lang=EN-US>(38)A</span>．<span class=SpellE><span lang=EN-US>authPriv</span></span>　　<span
lang=EN-US> B</span>．<span class=SpellE><span lang=EN-US>authNoPriv</span></span><span
lang=EN-US> C</span>．<span class=SpellE><span lang=EN-US>noAuthNoPriv</span></span><span
lang=EN-US> D</span>．<span lang=EN-US>a11<br>
</span>　　<span lang=EN-US>(39)A</span>．局域网　　<span class=GramE>　</span><span
lang=EN-US> B</span>．以太网　　<span lang=EN-US> C</span>．令牌环网　　<span lang=EN-US> D</span>．光纤网<span
lang=EN-US><br>
</span>　　<span lang=EN-US>(40)A</span>．两个地区之间<span lang=EN-US> B</span>．两个子网<span
class=GramE>之间　</span><span lang=EN-US>C</span>．一对主机<span class=GramE>之间　</span><span
lang=EN-US> D</span>．一个机器内部<span lang=EN-US> <o:p></o:p></span></span></p>

<p><span style='font-size:10.5pt;color:black'>　　<span lang=EN-US>●</span>局域网中使用的传输介质有双绞线、同轴电缆和光纤等。<span
lang=EN-US>10BASE-T</span>采用<span lang=EN-US>3</span>类<span lang=EN-US>UTP</span>，规定从收发怒到有源集线器的距离不超过<span
lang=EN-US>__(41)__</span>米。<span lang=EN-US>100BASE-TX</span>把数据传输速率提高了<span
lang=EN-US>10</span>倍，同时网络的覆盖范围<span lang=EN-US>__(42)__</span>。假设<span
class=SpellE><span lang=EN-US>t<sub>PHY</sub></span></span>表示工作站的物理层时延，<span
lang=EN-US>C</span>表示光速，<span lang=EN-US>S</span>表示网段长度，<span class=SpellE><span
lang=EN-US>t<sub>R</sub></span></span>表示中继器的时延，在<span lang=EN-US>10BASE-5</span>最大配置的情况下，冲突<span
class=GramE>时槽约等于</span><span lang=EN-US>__(43)__</span>。光纤分为单模光纤和多模光纤，与多模光纤相比，单模光纤的主要特点是<span
lang=EN-US>__(44)__</span>，为了充分利用其容量，可使用<span lang=EN-US>__(45)__</span>技术同时传输多路信号。<span
lang=EN-US><br>
</span>　　<span lang=EN-US>(41)A</span>．<span lang=EN-US>100</span><span
class=GramE>　　　　　</span><span lang=EN-US>B</span>．<span lang=EN-US>185</span><span
class=GramE>　　　　</span><span lang=EN-US>C</span>．<span lang=EN-US>300</span><span
class=GramE>　　　　　</span><span lang=EN-US>D</span>．<span lang=EN-US>1000<br>
</span>　　<span lang=EN-US>(42)A</span>．保持不变　　<span lang=EN-US> B</span>．缩小了　　<span
lang=EN-US> C</span>．扩大了<span lang=EN-US> D</span>．没有限制<span lang=EN-US><br>
</span>　　<span lang=EN-US>(43)A</span>．<span lang=EN-US>S/0.7C+2t<sub>PHY</sub>+8t<sub>R</sub></span><span
class=GramE>　　　　　　</span><span lang=EN-US>B</span>．<span lang=EN-US>2S/O.7C+2t<sub>PHY</sub>+8t<sub>R</sub><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>C</span>．<span lang=EN-US>2S/0.7C+t<sub>PHY</sub>+8t<sub>R</sub></span><span
class=GramE>　　　　　　</span><span lang=EN-US>D</span>．<span lang=EN-US>2S/0.7C+2t<sub>PHY</sub>+4t<sub>R</sub><br>
</span>　　<span lang=EN-US>(44)A</span>．高速度、短距离、高成本、<span class=GramE>粗芯线</span><span
lang=EN-US><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>B</span>．高速度、长距离、低成本、<span
class=GramE>粗芯线</span><span lang=EN-US><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>C</span>．高速度、短距离、低成本、<span
class=GramE>细芯线</span><span lang=EN-US><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>D</span>．高速度、长距离、高成本、<span
class=GramE>细芯线</span><span lang=EN-US><br>
</span>　　<span lang=EN-US>(45)A</span>．<span lang=EN-US>TDM</span><span
class=GramE>　　　　　</span><span lang=EN-US>B</span>．<span lang=EN-US>FDM</span><span
class=GramE>　　　　</span><span lang=EN-US>C</span>．<span lang=EN-US>WDM</span><span
class=GramE>　　　　　</span><span lang=EN-US>D</span>．<span lang=EN-US>ATDM <o:p></o:p></span></span></p>

<p><span style='font-size:10.5pt;color:black'>　　<span lang=EN-US>●FDDI</span>的基本编码方法是<span
lang=EN-US>__(46)__</span>，在此基础上采用<span lang=EN-US>__(47)__</span>编码以获得足够多的同步信息，这样使编码效率提高到<span
lang=EN-US>__(48)__</span>。为了消除环网中的时钟偏移，<span lang=EN-US>FDDI</span>使用了<span
lang=EN-US>__(49)__</span>方案，并规定进入站点缓冲器的数据时钟由输入信号的时钟确定，缓冲器的输出时钟信号由<span
lang=EN-US>__(50)__</span>确定。<span lang=EN-US><br>
</span>　　<span lang=EN-US>(46)A</span>．<span lang=EN-US>Manchester</span>　<span
lang=EN-US> B</span>．差分<span lang=EN-US>Manchester</span>　　<span lang=EN-US> C</span>．<span
lang=EN-US>NRZ</span>　<span lang=EN-US>D</span>．<span lang=EN-US>NRZ-I<br>
</span>　　<span lang=EN-US>(47)A</span>．<span lang=EN-US>4B/5B</span><span
class=GramE>　　　　</span><span lang=EN-US>B</span>．<span lang=EN-US>5B/6B</span>　　<span
class=GramE>　</span><span lang=EN-US>C</span>．<span lang=EN-US>8B6T</span><span
class=GramE>　　　　</span><span lang=EN-US> D</span>．<span lang=EN-US>MLT-3<br>
</span>　　<span lang=EN-US>(48)A</span>．<span lang=EN-US>25</span>％<span
class=GramE>　　　　</span><span lang=EN-US> B</span>．<span lang=EN-US>50</span>％　　<span
class=GramE>　</span><span lang=EN-US> C</span>．<span lang=EN-US>80</span>％<span
class=GramE>　　　　</span><span lang=EN-US> D</span>．<span lang=EN-US>100</span>％<span
lang=EN-US><br>
</span>　　<span lang=EN-US>(49)A</span>．带锁相环电路的分布式时钟　<span lang=EN-US> B</span>．带锁相环电路的集中式时钟<span
lang=EN-US><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>C</span>．带弹性缓冲器的分布式时钟　<span
lang=EN-US> D</span>．带弹性缓冲器的集中式时钟<span lang=EN-US><br>
</span>　　<span lang=EN-US>(50)A</span>．本站的时钟<span class=GramE>　　　　　　　　</span><span
lang=EN-US> B</span>．输入信号的时钟<span lang=EN-US><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>C</span>．信号固有的时钟<span
class=GramE>　　　　　　</span><span lang=EN-US> D</span>．环上固有的时钟<span lang=EN-US> <o:p></o:p></span></span></p>

<p><span style='font-size:10.5pt;color:black'>　　<span lang=EN-US>●</span>在<span
lang=EN-US>Linux</span>网络配置中，可以通过运行<span lang=EN-US>__(51)__</span>命令来设置主机名字；在不使用<span
lang=EN-US>DNS</span>和<span lang=EN-US>NIS</span>进行地址解析时，为保证<span class=GramE>解析器</span>能找到主机的<span
lang=EN-US>IP</span>地址，必须将所使用的主机名字写入<span lang=EN-US>__(52)__</span>文件中；<span
class=GramE>解析器</span>的功能是<span lang=EN-US>__(53)__</span>；<span lang=EN-US>Linux</span>中提供名字服务的程序是<span
lang=EN-US>__(54)__</span>；配置文件<span lang=EN-US>“host</span>．<span lang=EN-US>conf”</span>的主要作用是规定<span
class=GramE>解析器</span>所使用的<span lang=EN-US>__(55)__</span>。<span lang=EN-US><br>
</span>　　<span lang=EN-US>(51)A</span>．<span lang=EN-US>rout</span><span
class=GramE>　　　　</span><span lang=EN-US> B</span>．<span lang=EN-US>ping</span>　　<span
class=GramE>　</span><span lang=EN-US> C</span>．<span lang=EN-US>host</span><span
class=GramE>　　　　　</span><span lang=EN-US>D</span>．<span class=SpellE><span
lang=EN-US>hosmame</span></span><span lang=EN-US><br>
</span>　　<span lang=EN-US>(52)A</span>．<span lang=EN-US>/etc/networks</span><span
class=GramE>　　　　　　　</span><span lang=EN-US>B</span>．<span lang=EN-US>/etc/hosts<br>
</span><span class=GramE>　　　　</span><span lang=EN-US>C</span>．<span lang=EN-US>/etc/<span
class=SpellE>configs</span></span><span class=GramE>　　　　　　　</span><span
lang=EN-US> D</span>．<span lang=EN-US>/etc/address<br>
</span>　　<span lang=EN-US>(53)A</span>．存放主机名字和域名<span class=GramE>　　　　</span><span
lang=EN-US> B</span>．仅用于由<span lang=EN-US>IP</span>地址查找域名<span lang=EN-US><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>C</span>．仅用于由域名查找<span
lang=EN-US>IP</span>地址　　<span lang=EN-US> D</span>．实现主机名字与<span lang=EN-US>IP</span>地址的互查<span
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