📄 模拟考试7.htm
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<TD align=left height=212 width=607> 对照 ISO/OSI
参考模型各个层中的网络安全服务，在传输层主要解决进程到进程间的加密，最常见的传输层安全技术有__(29)__©) <BR>答：
<INPUT class=radio name=text1699 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.SET<BR> <INPUT class=radio name=text1699
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.IPsec<BR> <INPUT class=radio name=text1699
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.S-HTTP<BR> <INPUT class=radio name=text1699
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.SSL <BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>41 </TD>
<TD align=left height=212 width=607> 对照 ISO/OSI
参考模型各个层中的网络安全服务，为了将低层安全服务进行抽象和屏蔽，最有效的一类做法是可以在传输层和应用层之间建立中间件层次实现通用的安全服务功能，通过定义统一的安全服务接口向应用层提供__(30)__安全服务。©)
<BR>答： <INPUT class=radio name=text1701
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.身份认证<BR> <INPUT class=radio name=text1701
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.访问控制 <BR> <INPUT class=radio name=text1701
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.身份认证、访问控制和数据加密<BR> <INPUT class=radio
name=text1701 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.数据加密<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>42 </TD>
<TD align=left height=212 width=607> TCP
是一个面向连接的协议，为了提高效率，又引入了滑动窗口协议，协议规定重传__(33)__的分组©) <BR>答： <INPUT
class=radio name=text1708 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.未被确认及至窗口首端的所有分<BR> <INPUT class=radio
name=text1708 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.未被确认<BR> <INPUT class=radio name=text1708
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.未被确认及至退回N值的所有分组<BR> <INPUT class=radio
name=text1708 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.仅丢失的<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>43 </TD>
<TD align=left height=212 width=607> TCP
是一个面向连接的协议，为了提高效率，又引入了滑动窗口协议，TCP协议采用滑动窗口协议解决了__(35)__。 ©) <BR>答：
<INPUT class=radio name=text1712 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.端到端的流量控制<BR> <INPUT class=radio
name=text1712 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.整个网络的拥塞控制<BR> <INPUT class=radio
name=text1712 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.端到端的流量控制和网络的拥塞控制<BR> <INPUT class=radio
name=text1712 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.整个网络的差错控制 <BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>44 </TD>
<TD align=left height=212 width=607> 当计算机需要通过相连的 MORDEM
发送数据时，依次设置的信号是__(50)__。©) <BR>答： <INPUT class=radio name=text1957
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.MODEM就绪→
DTE就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清MODEM就绪→清DTE就绪<BR>
<INPUT class=radio name=text1957 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.MODEM就绪→DTE就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清DTE就绪→清MODEM就绪<BR>
<INPUT class=radio name=text1957
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.DTE就绪→MODEM就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清MODEM就绪→清DTE就绪<BR>
<INPUT class=radio name=text1957
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.DTE就绪→MODEM就绪→请求发送→允许发送→发数据→清请求发送→清允许发送→清DTE就绪→清MODEM就绪<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>45 </TD>
<TD align=left height=212 width=607> ATM
网络中使用信元作为传输数据的单位，当信元从用户端进入网络中第一个交换机后，信元头中修改的部分是__(51)__。©) <BR>答：
<INPUT class=radio name=text1958 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.VCI<BR> <INPUT class=radio name=text1958
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.GFC<BR> <INPUT class=radio name=text1958
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.CLP<BR> <INPUT class=radio name=text1958
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.PT<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>46 </TD>
<TD align=left height=212 width=607> 信元传输采用__(52)__。©) <BR>答：
<INPUT class=radio name=text1959 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
TDM<BR> <INPUT class=radio name=text1959
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.FDM<BR> <INPUT class=radio name=text1959
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.WDM<BR> <INPUT class=radio name=text1959
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.ATDM<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>47 </TD>
<TD align=left height=212 width=607> 当进行 VP 交换时，VPI 和 VCI
的变化情况是__(53)__。©) <BR>答： <INPUT class=radio name=text1960
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.VPI变化，VCI不变<BR> <INPUT class=radio
name=text1960 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.VPI不变，VCI变化<BR> <INPUT class=radio
name=text1960 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.VPI变化，VCI变化<BR> <INPUT class=radio
name=text1960 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.VPI不变，VCI不变<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>48 </TD>
<TD align=left height=212 width=607> ATM
网络中使用信元作为传输数据的单位，当需要传输压缩的视频流数据时，采用的服务类别最好是__(54)___。 ©) <BR>答：
<INPUT class=radio name=text1961 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.CBR <BR> <INPUT class=radio name=text1961
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.ABR <BR> <INPUT class=radio name=text1961
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.UBR <BR> <INPUT class=radio name=text1961
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.rt-VBR <BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>49 </TD>
<TD align=left height=212 width=607> 设置 index.html 或
default.html 为目录下默认文档的指令是__(59)__©) <BR>答： <INPUT class=radio
name=text1966 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.IndexOptions<BR> <INPUT class=radio
name=text1966 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.DirectoryIndex<BR> <INPUT class=radio
name=text1966 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.DirectoryDefault<BR> <INPUT class=radio
name=text1966 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.Indexlgnore<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>50 </TD>
<TD align=left height=212 width=607>
如果允许以“http://www.xxx.edu.cn/~username”方式访问用户的个人主页，必须通过__(60)__指令设置个人主页文档所在的目录。©)
<BR>答： <INPUT class=radio name=text1967
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=A>A.VirtualHost<BR> <INPUT class=radio
name=text1967 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.VirtualDiretory<BR> <INPUT class=radio
name=text1967 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.UserHome<BR> <INPUT class=radio
name=text1967 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.Userdir<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>51 </TD>
<TD align=left height=212 width=607>
为了在广域网上高速传输数字信号，一般可用的编码方式是___(3)___©) <BR>答： <INPUT class=radio
name=text1970 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
NRZ<BR> <INPUT class=radio name=text1970
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.AMI<BR> <INPUT class=radio name=text1970
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=C>C.曼彻斯特<BR> <INPUT class=radio name=text1970
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=D>D.8B/10B<BR></TD></TR>
<TR class=trh1>
<TD align=middle height=212 width=29>52 </TD>
<TD align=left height=212 width=607> 设某编码体制的编码方法为：输入数据、( m =
1,2,… )，发送时，首先计算 bm = (aM+bm-1 ) MOD 2，发送的编码为 Cm =
bm-bm-1。收到的编码为Cm，其译码方法可表示为___(5)___。©) <BR>答： <INPUT class=radio
name=text1971 onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio value=A>A.
C+Cm-1<BR> <INPUT class=radio name=text1971
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio
value=B>B.Cm-Cm-1<BR> <INPUT class=radio name=text1971
onblur="this.className='radio'"
onfocus="this.className='inputedit';this.select()" type=radio va⌨️ 快捷键说明
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