2. 计算机
  3. 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

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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、routable
B、locatable
C、path-selected
D、road-defined
答案A
解析
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