单项选择题
A.B.C.<html>D.<meta>一个HTML文件的起始标记为（）。……</h1>
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一个HTML文件的起始标记为（）。 <br />
<br />
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A.<body><br />
B.<title><br />
C.<html><br />
D.<meta></p>
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</p>
<p>
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<p>
<meta />
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<a title="网络用户能进行QQ聊天，但在浏览器地址栏中输入 www.ceiaec.org 却不能正常访问该页面，此时应检查（）。" href="https://m.zhaokaoti.com/view/shiti/B7354196D2C1B151.html">
<p class="content"><span>单项选择题</span>网络用户能进行QQ聊天，但在浏览器地址栏中输入 www.ceiaec.org 却不能正常访问该页面，此时应检查（）。</p>
<p>
A.网络物理连接是否正常<br />
B.DNS服务器是否正常工作<br />
C.默认网关设置是否正确<br />
D.IP地址设置是否正确</p>
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<a title="下列Internet应用中，传输层需要采用UDP协议的是（）。" href="https://m.zhaokaoti.com/view/shiti/21768E36F9F6EFA8.html">
<p class="content"><span>单项选择题</span>下列Internet应用中，传输层需要采用UDP协议的是（）。</p>
<p>
A.IP电话<br />
B.浏览Web页面<br />
C.telnet<br />
D.发送电子邮件</p>
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<a title="安全的Web服务器与客户端之间通过（）协议进行通信。" href="https://m.zhaokaoti.com/view/shiti/B38BE2ADDDC02ECC.html">
<p class="content"><span>单项选择题</span>安全的Web服务器与客户端之间通过（）协议进行通信。</p>
<p>A.HTTP+SSL<br/>B.Telnet+SSL<br/>C.Telnet+HTTP<br/>D.HTTP+FTP</p>
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<p class="content"><span>单项选择题</span>在Outlook中，通常借助（）来传送一个文件。</p>
<p>
A.邮件正文<br />
B.Telnet<br />
C.WWW<br />
D.附件功能</p>
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<p class="content"><span>单项选择题</span>通过局域网接入因特网如下图所示，图中箭头所指的两个设备是（）。</p>
<p>
A.二层交换机<br />
B.路由器<br />
C.网桥<br />
D.集线器</p>
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