24998
For this reason , null routes are often used on high-performance core router s to mitigate large-scale denial-of-service attack s before the packets reach a bottleneck , thus avoiding collateral damage from DDoS attacks — although the target of the attack will be inaccessible to anyone .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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