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Computer networks are connected together to form larger networks such as campus networks, corporate networks, or the Internet. Routers are network devices that may be used to connect these networks (e.g., a home network connected to the network of an Internet service provider). When a router interconnects many networks or handles much network traffic, it may become a bottleneck and cause network congestion (i.e., traffic loss). A number of techniques have been developed to prevent such problems. One of them is the network search engine (NSE), also known as ''network search element''. This special-purpose device helps a router perform one of its core and repeated functions very fast: address lookup. Besides routing, NSE-based address lookup is also used to keep track of network service usage for billing purposes, or to look up patterns of information in the data passing through the network for security reasons .〔IDT (Network Search Engine product flyer ).〕 Network search engines are often available as ASIC chips to be interfaced with the network processor of the router. Content-addressable memory and Trie are two techniques commonly used when implementing NSEs.〔GRID Today news: (''IDT Delivers First Search Engine With Interface To Networks'' ).〕〔(Design Criteria for Searching Databases ), CommsDesign〕 ==References== (''IDT Next Generation Search Engines'' ). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Network search engine」の詳細全文を読む スポンサード リンク
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