22 - Hubs Bridgres Switches

22 - Hubs Bridgres Switches - Last Lecture Data Link Layer...

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Last Lecture: Data Link Layer 1. Design goals and issues 2. (More on) Error Control and Detection 3. Multiple Access Control (MAC) 4. Ethernet, LAN Addresses and ARP 5. Hubs, Bridges, Switches 6. Wireless LANs 7. WLAN Security 8. Mobile Networking SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 1
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This Lecture: Data Link Layer 1. Design goals and issues 2. (More on) Error Control and Detection 3. Multiple Access Control (MAC) 4. Ethernet, LAN Addresses and ARP 5. Hubs, Bridges, Switches o Credits: some slides from Jennifer Rexford @ Princeton 6. Wireless LANs 7. WLAN Security 8. Mobile Networking SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 2
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Shuttling Data at Different Layers Application gateway Transport gateway Router Bridge, switch Repeater, hub Frame header Packet header TCP header User data Layer Unit type Device Network Packets Routers Datalink Frames Switches, Bridges Physical Electrical signals Repeaters, Hubs SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 3
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Physical Layer: Repeaters Distance limitation in local-area networks Electrical signal becomes weaker as it travels Imposes a limit on the length of a LAN Repeaters join LANs together Analog electronic device Continuously monitors electrical signals on each LAN Transmits an amplified copy SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 4
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Magnum 200X Two-Port Repeater SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 5
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Physical Layer: Hubs Joins multiple input lines electrically Designed to hold multiple line cards Do not necessarily amplify the signal Very similar to repeaters Also operates at the physical layer hub hub hub hub SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 6 CS Math EE
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Magnum 3000 Series Stackable Hubs SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 7
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Limitations of Repeaters and Hubs One large shared link, thus throughput limited Each bit is sent everywhere E.g., three departments each get 10 Mbps independently … and then connect via a hub and must share 10 Mbps Cannot support multiple LAN technologies Does not buffer or interpret frames So, can’t interconnect between different rates or formats E.g., 10 Mbps Ethernet and 100 Mbps Ethernet Limitations on maximum nodes and distances Shared medium imposes length limits ( 2 τ R ) E.g., cannot go beyond 2500 meters on Ethernet SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 8
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Link Layer: Bridges Connects two or more LANs at the link layer Extracts destination address from the frame Looks up the destination in a table Forwards the frame to the appropriate LAN segment Each segment can carry its own traffic host host host host host host host host host host host host Bridge SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 9
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