A number of techniques have been developed to prevent such problems.
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 .
Content-addressable memory and Trie are two techniques commonly used when implementing NSEs.
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