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L1-intro.ppt - Introduction to Networks CS487/587 Lecture...

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Introduction to Networks CS487/587 Lecture Department of Computer Science Iowa State University
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In the beginning, everything is 0 and 1
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Network Basics Communication Media 1/0 Protocol: Predefined formats (preexisting agreement) as to how to represent information, how to structure, how to send and receive, and how to interpret Store and forward packet switching Circuit switching
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OSI 7-Layer Model Application Transport Network Link Physical Presentation Session Application Layer Transport Layer (TCP/UDP) 5-Layer Model
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Bit Communication media (copper, fiber, air, etc.) Signal processing (0/1 representation, speed, etc.) Applications Beacon tower (fire) Other (sound, pheromone) Application Transport Network Link Physical Presentation Session OSI 7-Layer Model
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Frame Typically contains a few hundreds of bytes Special mark for start and end of each frame Checksum error detections (or even correction) Erroneous frames can be discarded or retransmitted Application Transport Network Link Physical Presentation Session OSI 7-Layer Model Communication Media 1101010...
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Packets, also known as datagram Packet routing and congestion control Challenges of path finding Network heterogeneity e.g., from Ethernet to Token Ring to FDDI Multi-hop A data packet may have to go several hops before reaching its destination Multi-path The shortest route is not always the best route What really matters is the amount of delay on a given route Application Transport Network Link Physical Presentation Session OSI 7-Layer Model
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Data stream Provide a virtual tunnel for end-to-end connection Flow control
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