2. 计算机
  3. Most IP layer-based proxy mechanisms，such as network address translation (NAT)，only supportuni-directional proxy，from the intern

Most IP layer-based proxy mechanisms，such as network address translation (NAT)，only supportuni-directional proxy，from the intern

admin2010-12-16  35
问题 Most IP layer-based proxy mechanisms，such as network address translation (NAT)，only supportuni-directional proxy，from the internal network to external network(the Interned．The proxvestablishes the communication channel by (71) IP addresses．The IP addresses must be (72) ．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 (73) for each application that uses (74) channels． SOCKS identifies communication targets through domain names，overcoming the restriction of Usina private IP addresses．SOCKS can use domain names to establish communication between separate LANs，with (75) IP addresses．
选项 A、duplicating
B、crossing
C、overlapping
D、repeating
答案C
解析 大多数基于IP层的代理机制，例如网络地址转化(NAT)机制，只支持从内网到外网(Internet)的单向的代理。代理是利用(manipulating)IP地址来建立信道。这个IP地址必须是可路由的(routable)。这种代理机制阻止了那些必须有返回数据通道的应用程序建立它们的数据通道，例如多媒体应用程序。基于IP层的代理机制需要给每个使用多(multiple，多个的)通道的应用程序添加相应的软件模块(modules)。SOCKS以域名来鉴别通信目标，以克服使用私有IP地址的局限性。SOCKS以用域名在具有重叠(overlapping)IP地址的各个分离的局域网之间建立通信。
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