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Most IP layer-based proxy mechanisms, such as network address translation(NAT), only support uni-directional proxy, from the int
Most IP layer-based proxy mechanisms, such as network address translation(NAT), only support uni-directional proxy, from the int
admin
2009-05-15
41
问题
Most IP layer-based proxy mechanisms, such as network address translation(NAT), only support uni-directional proxy, from the internal network to external network(the Internet). The proxy establishes the communication channel by(86) IP addresses. The IP addresses must be(87). These proxy mechanisms prevent applications that must establish return data channels from establishing their data channels, such as, multimedia applications. IP layer-based proxy mechanisms need additional software(88)for each application that uses(89)channels. SOCKS identifies communication targets through domain names, overcoming the restriction of using private IP addresses. SOCKS can use domain names to establish communication between separate LANs, with(90)IP addresses.
选项
A、duplicating
B、crossing
C、overlapping
D、repeating
答案
C
解析
大部分基于IP层的代理机制(例如网络地址翻译 NAT)只支持从内部网络到外部网络(Internet)的单向代理。代理通过操作IP地址建立通信通道。IP地址必须是可路由的。这种代理机制使得那些必须建立返回数据通道的应用无法建立它们的数据通道,例如多媒体应用。基于IP层的代理机制对每一个使用多个通道的应用都需要附加的软件模块。SOCKS通过域名识别通信目标,克服了使用专用IP地址的局限。SOCKS可使用域名在各个分离的LAN之间建立通信,这些LAN具有重叠的IP地址。
在(86)小题的备选项中,manipulating和conduct都有“操作”的意思,但manipulating侧重于“处理、使用”,而conduct侧重于“引导、管理”。在(90)小题的备选项中,duplicating 是指“复制、副本”,指完全一样。而overlapping 是指“重叠、交叉”,既有相同的部分,也有不同的部分。
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