'Make pkt expectedseqnum' presentation slideshows

Transport Reliability: Sliding Window Protocols

Transport Reliability: Sliding Window Protocols. 3/1/2012. Admin.: PS2. Exam 1 PS2. proj-sol: 129 400 3045 FishThread.java 388 1457 12873 Node.java 51 167 1145 PingRequest.java 83 250 2106 SimpleTCPSockSpace.java 181 605 5248 TCPManager.java

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Computer Networks

Computer Networks. Lecture 16 Sliding Window Protocols; TCP Reliability 10/22/2013. Admin.: Assignment 4. Exam 1: Tuesday Oct. 29 in class Closed book but one piece of paper with any summary Assignment 4 to be posted tonight. proj-sol: 129 400 3045 FishThread.java

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EEC-484/584 Computer Networks

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EEC-484/584 Computer Networks

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EEC-484/584 Computer Networks

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EEC-484/584 Computer Networks

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EEC-484/584 Computer Networks

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Transport Layer

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EEC-484/584 Computer Networks

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CIS 5617, Spring2019 Anduo Wang Based on Slides created by JFK/KWR

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Homework

Homework. Chapter 2#10,13-18 Due Wed September 17. 3.1 Transport-layer services 3.2 Multiplexing and demultiplexing 3.3 Connectionless transport: UDP 3.4 Principles of reliable data transfer. 3.5 Connection-oriented transport: TCP segment structure reliable data transfer flow control

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Pipelined protocols

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Announcement

Announcement. Project 1 due last night, how is that ? Project 2 almost ready, out tomorrow, will post online Much harder than project 1, start early!. Review of Previous Lecture. Transport-layer services Multiplexing and demultiplexing Connectionless transport: UDP

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rdt2.1: sender, handles garbled ACK/NAKs

Wait for ACK or NAK 0. Wait for call 1 from above. Wait for ACK or NAK 1. rdt2.1: sender, handles garbled ACK/NAKs. rdt_send(data). sndpkt = make_pkt(0, data, checksum) udt_send(sndpkt). rdt_rcv(rcvpkt) && ( corrupt(rcvpkt) || isNAK(rcvpkt) ). Wait for call 0 from above.

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9: Pipelined Protocols and RTT

9: Pipelined Protocols and RTT. Slides adapted from: J.F Kurose and K.W. Ross, 1996-2010. Stop and Wait. Rdt3.0 also called Stop and Wait Sender sends one packet, then waits for receiver response What is wrong with stop and wait? Slow!! Must wait full round trip time between each send

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Announcement

Announcement. Project 1 due last night, how is that ? Homework 1 grade, comments out Will be discussed in the next lecture Homework 2 out Project 2 almost ready, out tomorrow, will post online Much harder than project 1, start early!. Review of Previous Lecture. Transport-layer services

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rdt2.1: sender, handles garbled ACK/NAKs

Wait for ACK or NAK 0. Wait for call 1 from above. Wait for ACK or NAK 1. rdt2.1: sender, handles garbled ACK/NAKs. rdt_send(data). sndpkt = make_pkt(0, data, checksum) udt_send(sndpkt). rdt_rcv(rcvpkt) && ( corrupt(rcvpkt) || isNAK(rcvpkt) ). Wait for call 0 from above.

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rdt2.2: a NAK-free protocol

same functionality as rdt2.1, using ACKs only instead of NAK, receiver sends ACK for last pkt received OK receiver must explicitly include seq # of pkt being ACKed duplicate ACK at sender results in same action as NAK: retransmit current pkt. rdt2.2: a NAK-free protocol.

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rdt2.2: a NAK-free protocol

same functionality as rdt2.1, using ACKs only instead of NAK, receiver sends ACK for last pkt received OK receiver must explicitly include seq # of pkt being ACKed duplicate ACK at sender results in same action as NAK: retransmit current pkt. rdt2.2: a NAK-free protocol.

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CS 471/571

CS 471/571. Transport Layer 4 Slides from Kurose and Ross. rdt3.0: stop-and-wait operation. sender. receiver. first packet bit transmitted, t = 0. last packet bit transmitted, t = L / R. first packet bit arrives. RTT. last packet bit arrives, send ACK. ACK arrives, send next

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