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Authors:
James F. Kurose, Keith W. Ross
Chapter:
Application Layer
Exercise:
Review
Question:22 | ISBN:9780132856201 | Edition: 6

Question

Consider a new peer Alice that joins BitTorrent without possessing any chunks. Without any chunks, she cannot become a top-four uploader for any of the other peers, since she has nothing to upload. How then will Alice get her first chunk?

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Answer

Recall that in BitTorrent, a peer picks a random peer and optimistically unchokes the peer for a short period of time. Therefore, Alice will eventually be optimistically unchoked by one of her neighbors, during which time she will receive chunks from that neighbor.

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