Sybil attack countermeasure

Sybil attack countermeasure

In Bitcoin Wiki Weaknesses: Sybil attack they mention that:

"Bitcoin makes these attacks more difficult by only making an outbound connection to one IP address per /16 (x.y.0.0)".

Why would this make a Sybil attack more difficult? Is there a reason for choosing a /16 subnet or is it randomly chosen by the developers with no background? Wouldn't it be more secure to choose a smaller subnet?

http://ift.tt/2i2beax

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