MMT1-Lec3 - Computer Networks 1(Mng My Tnh 1 Lectured by...

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Computer Networks 1 (M ng Máy Tính 1) Lectured by: Nguy n Đứ c Thái
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Lecture 3: Networking Technologies Reference : Chapter 4 - “ Computer Networks ”, Andrew S. Tanenbaum, 4th Edition, Prentice Hall, 2003.
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3 Content Channel allocation problem Multiple access protocols Ethernet LAN Wireless LAN
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4 Channel Allocation Problem How to allocate a single broadcast channel amongst competing users? Static method Dynamic method
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5 Static Channel Allocation in LANs and MANs Each user is assigned with a equal-portion of the bandwidth No interference between users Simple In efficient if there are a lot of users in the network
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6 Dynamic Channel Allocation in LANs and MANs Five key assumptions Station Model: The model consists of N stations Once a frame is generated, the station blocks until the frame has been successfully transmitted Single Channel Assumption Collision Assumption Collision happens when two frames are transmitted simultaneously and overlap in time (a) Continuous Time vs (b) Slotted Time (a) Carrier Sense vs (b) No Carrier Sense
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7 Multiple Access Protocols ALOHA Carrier Sense Multiple Access Protocols
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