| Breadth of deployment |
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| Source blocking: |
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| Content
blocking: |
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| • | Transit
filtering is more effective than inbound only |
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| filtering. |
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| • | Blocking
at high outdegree ASes is more effective |
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| than
blocking at edges. |
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| • | Top
100 ASes are 5-10x as effective as top 10 ASes. |
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