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Course: ECE 4450, Fall 2008School: Cornell
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P2P 1. File Distribution server starts out with the file and must send each bit of file out at least once into the network. a. Each user contributes to the total upload capacity. b. Bounds are still included {NF/us, F/dmin} c. Total upload capacity {us, sum of peer ui} d. Min Distribution time is max {NF/us, F/dmin, NF/sum(us + sum ui)} e. P2P is faster than server client even as N goes up. 2. BitTorrent p2p...
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P2P 1. File Distribution server starts out with the file and must send each bit of file out at least once into the network. a. Each user contributes to the total upload capacity. b. Bounds are still included {NF/us, F/dmin} c. Total upload capacity {us, sum of peer ui} d. Min Distribution time is max {NF/us, F/dmin, NF/sum(us + sum ui)} e. P2P is faster than server client even as N goes up. 2. BitTorrent p2p sharing in which a group of peers join a torrent and begin trading chunks of a file with each other. Chunks are tracked by a tracker. a. Tracker keeps track of who has what chunks and can send list of chunks per peer to anyone in the torrent. b. Distribution a peer requests the rarest chunks of the file first. Chunks of which there are the least copies in torrent. Peers serve those who serve them with highest upload rate. c. Every 10 s top uploader list is updated, Every 30 s a peer sends a random peer chunks. d. Eliminates free-riding in p2p file sharing. Chapter 3: Transport Layer Transport Layer Services 1. Transport vs. Network transport layer provides communication processes, between while network layer provides communication between hosts. a. Transport layer resides within end systems, and is responsible for pushing data to the network edge. 2. TCP provides three services which are reliable data transfer, flow control, and congestion control (throttle of sender transmission rate). Multiplexing/Demultiplexing 1. Sockets are the intermediate software interfaces between processes. 2. UDP Socket two-tuple and contains the destination IP, and destination port number. a. IP identifies the host, and port identifies the process socket. 3. TCP Socket TCP segment is four-tuple and contains the source IP/port, and destination IP/port. The socket uses all four values to demultiplex into a. With all four values it can distinguish who sent what, and send receipts back. b. UDP doesnt need to do this since it does not provide reliability. Connectionless Transport: UDP
1. UDP is a no frills protocol, that has an 8 byte header for segments. a. No delay in establishing a connection b. Smaller packet sizes, so faster to transmit
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