MMT1-Lec6 - Computer Networks 1(Mng My Tnh 1 Lectured by...

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1 Computer Networks 1 (Mạng Máy Tính 1) Lectured by: Nguyễn Đức Thái
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2 Lecture 5: Network Layer (cont’) Reference : Chapter 5 - “ Computer Networks ”, Andrew S. Tanenbaum, 4th Edition, Prentice Hall, 2003.
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3 Contents The network layer design issues Routing algorithms Congestion control algorithms Quality of services Internetworking The network layer in the Internet
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4 Congestion Control Algorithms General Principles of Congestion Control Congestion Prevention Policies Congestion Control in Virtual-Circuit Subnets Congestion Control in Datagram Subnets Load Shedding Jitter Control
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5 Network Congestion When too much traffic is offered, congestion sets in and performance degrades sharply.
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6 General Principles of Congestion Control Open loop solutions Solve the problems by good design Prevent congestions from happening Make decision without regard to state of the network Closed loop solutions Using feedback loop
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7 Closed Loop Solutions – Three Part Feedback Loop Monitor the system detect when and where congestion occurs. Pass information to where action can be taken. Adjust system operation to correct the problem.
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8 Open Loop Solutions - Congestion Prevention Policies Policies that affect congestion.
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9 Congestion Control in Virtual-Circuit Subnets (a) A congested subnet. (b) A redrawn subnet, eliminates congestion and a virtual circuit from A to B.
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10 Congestion Control in Datagram Subnets Warning bit Routers use a bit in the packet’s header to signal the
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MMT1-Lec6 - Computer Networks 1(Mng My Tnh 1 Lectured by...

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