Typical Web packet Notice that layers add overhead u Space headers effective

Typical web packet notice that layers add overhead u

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Typical Web packet Notice that layers add overhead u Space (headers), effective bandwidth u Time (processing headers, “peeling the onion”), latency CSE 123 – Lecture 2: Layers & Framing 7 IP Hdr Payload (Web object) TCP Hdr HTTP Hdr Ethernet Hdr Start of packet End of packet datalink network transport application Which header gets added first? A. Ethernet B. IP C. TCP D. HTTP
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Data Link Physical Applications The Hourglass Model “Thin Waist” FTP HTTP TFTP NV TCP UDP IP NET 1 NET 2 NET n Internet Protocol Suite CSE 123 – Lecture 2: Layers & Framing 8 Transport
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For now: (Data) Link Layer Framing u Break stream of bits up into discrete chunks Error handling u Detect and/or correct errors in received frames Multiplexing u Determine appropriate destination for a given frame u Also not always required; again, point-to-point CSE 123 – Lecture 2: Layers & Framing 10
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Today’s Focus: Framing Break down a stream of bits into smaller, digestible chunks called frames Allows the link to be shared u Multiple senders and/or receivers can time multiplex the link u Each frame can be separately addressed Provides manageable unit for error handling u Easy to determine whether something went wrong u And perhaps even to fix it if desired CSE 123 – Lecture 2: Layers & Framing 11
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What’s a Frame? Wraps payload up with some additional information u Header usually contains addressing information u Maybe includes a trailer (w/checksum—next lecture) Basic unit of reception u
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  • Fall '08
  • Varghese,G

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