200401_wlgcs_a.htm

参加全国网络工程师考试的参考资料

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<p class=MsoNormal align=left style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:left;mso-pagination:widow-orphan'><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-bidi-font-family:宋体;color:black;mso-font-kerning:
0pt'>下午答案<span lang=EN-US><br>
</span>试题<span class=GramE>一</span><span lang=EN-US><br>
</span>　<span lang=EN-US>[</span>问题<span lang=EN-US>1] GPRS</span>和<span
lang=EN-US>CDMA</span>。<span lang=EN-US><br>
</span>　<span lang=EN-US>[</span>问题<span lang=EN-US>2] WCDMA</span>、<span
lang=EN-US>CDMA2000</span>和<span lang=EN-US>TD-SCDMA<br>
</span>　<span lang=EN-US>[</span>问题<span lang=EN-US>3] </span>进行一次查询操作，采用移动电话时的费用为<span
lang=EN-US>(1280+6400)×0.0003/128=0.018</span>元，<span lang=EN-US>PDA</span>费用为<span
lang=EN-US>90/60×0.2/3=0.1</span>元，故由<span lang=EN-US>(35-25)/(0.1-0.018)=121.9512</span>，最少次数为<span
lang=EN-US>122(</span>次<span lang=EN-US>)</span>。<span lang=EN-US><br>
</span>　<span lang=EN-US>[</span>问题<span lang=EN-US>4] DMZ</span>中放置邮件服务器、应用网关、电子商务系统。内网中放置机密数据服务器、私人信息<span
lang=EN-US>PC</span>和放置资源代码的<span lang=EN-US>PC</span>。<span lang=EN-US>DMZ</span>是放置公共信息的最佳位置，用户、潜在用户和外部访问者不用通过内网就可以直接获得他们所需要的关于公司的一些信息。公司中机密的、私人的信息可以安全地存放入内网中，即<span
lang=EN-US>DMZ</span>的后面。<span lang=EN-US>DMZ</span>中服务器不应包含任何商业机密、资源代码或是私人信息。<span
lang=EN-US><o:p></o:p></span></span></p>

<p class=MsoNormal align=left style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:left;mso-pagination:widow-orphan'><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-bidi-font-family:宋体;color:black;mso-font-kerning:
0pt'>试题二<span lang=EN-US><br>
</span>　<span lang=EN-US>[</span>问题<span lang=EN-US>1] </span>在应用服务器关机的情况下，告诉员工仍能上<span
class=SpellE><span lang=EN-US>Intemet</span></span>。员工：的<span lang=EN-US>PC</span>机通过<span
lang=EN-US>hub</span>，经由路由器的<span lang=EN-US>ISDN</span>接口连接<span lang=EN-US>ISDN</span>，最后到达<span
lang=EN-US>ISP</span>。<span lang=EN-US><br>
</span>　<span lang=EN-US>[</span>问题<span lang=EN-US>2] </span>不需要加入<span
lang=EN-US>TA</span>。当非<span lang=EN-US>ISDN</span>终端用户连接到<span lang=EN-US>ISDN</span>设备时才需要加入<span
lang=EN-US>TA</span>。<span lang=EN-US><br>
</span>　<span lang=EN-US>[</span>问题<span lang=EN-US>3]<br>
</span>　　<span lang=EN-US>(1) </span>计算机交换分机<span lang=EN-US>PBX(NT2)</span>。<span
lang=EN-US><br>
</span>　　<span lang=EN-US>(2) </span>网络终端设备<span lang=EN-US>(NT1)</span>。<span
lang=EN-US><br>
</span>　<span lang=EN-US>[</span>问题<span lang=EN-US>4] 1875*1024*8/128000=120</span>秒<span
lang=EN-US><o:p></o:p></span></span></p>

<p class=MsoNormal align=left style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:left;mso-pagination:widow-orphan'><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-bidi-font-family:宋体;color:black;mso-font-kerning:
0pt'>试题三</span><span lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:
宋体;mso-bidi-font-family:宋体;color:white;mso-font-kerning:0pt'>(</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
color:white;mso-font-kerning:0pt'>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='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
宋体;color:black;mso-font-kerning:0pt'><br>
</span><span style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
宋体;color:black;mso-font-kerning:0pt'>　<span lang=EN-US>[</span>问题<span
lang=EN-US>1]</span>在静态实现方式中，网络管理员将交换机端口静态地分配给某一个<span lang=EN-US>VLAN</span>，这是经常使用的一种配置方式，容易实现和监视，比较安全。在动态实现方式中，管理员必须先建立一个较复杂的数据库，例如输入要连接的网络设备的<span
lang=EN-US>MAC</span>地址及相应的<span lang=EN-US>VLAN</span>号，这样，当网络设备接到交换机端口时，交换机自动把这个网络设备所连接的端口分配给相应的<span
lang=EN-US>VLAN</span>。动态<span lang=EN-US>VLAN</span>的配置可以基于网络设备的<span
lang=EN-US>MAC</span>地址、<span lang=EN-US>IP.</span>地址、应用的协议来实现。动态<span
lang=EN-US>VLAN</span>一般通过管理软件来进行管理。<span lang=EN-US>Switch1</span>采用静态实现方式。<span
lang=EN-US><br>
</span>　<span lang=EN-US>[</span>问题<span lang=EN-US>2] STP(<span class=SpellE>SpanningTreeProtocol</span></span>，生成<span
class=GramE>树协议</span><span lang=EN-US>)</span>是一个既能够防止环