19 - Link Layer Intro - Last Lecture Network Layer 1 2 3 4...

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Last Lecture: Network Layer 1. Design goals and issues 2. Basic Routing Algorithms & Protocols 3. Addressing, Fragmentation and reassembly 4. Internet Routing Protocols and Inter-networking 5. Router design 1. Short History + Architectures 2. Switching fabrics 3. Address lookup problem 6. Congestion Control, Quality of Service 7. More on the Internet’s Network Layer 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 6. Wireless LANs SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 2
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What Does Link Layer Do? SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 3 Some terminology: Hosts and routers are nodes Communication channels that connect adjacent nodes along communication path are links Wired links Wireless links LANs Layer-2 packet is a frame , encapsulates datagram data-link layer has responsibility of transferring datagram from one node to adjacent node over a link
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Message, Segment, Packet, Frame SUNY at Buffalo; CSE 489/589 – Modern Networking Concepts; Fall 2010; Instructor: Hung Q. Ngo 4 4 HTTP TCP IP Ethernet interface HTTP TCP IP Ethernet interface IP IP Ethernet interface Ethernet interface SONET interface SONET interface host host router router HTTP message TCP segment IP packet IP packet IP packet Ethernet frame Ethernet frame SONET frame
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Link Layer for Each Hop IP packet transferred over multiple hops Each hop has a link layer protocol May be different on different hops
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