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 ² Station Model: ± The model consists of N stations ± Once a frame is generated, the station blocks until the frame has been successfully transmitted ² Single Channel Assumption ² Collision Assumption ± Collision happens when two frames are transmitted simultaneously and overlap in time ² (a) Continuous Time vs (b) Slotted Time ² (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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MMT1-Lec3 - Computer Networks 1 (Mng My Tnh 1) Lectured by:...

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