Chapter3_Fall2011_IK

Chapter3_Fall2011_IK - Chapter 3 Transport Layer Last...

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Transport Layer 3-1 Chapter 3: Transport Layer Last Update: Oct 25, 2011
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Transport Layer 3-2 Chapter 3: Transport Layer Our goals: understand principles behind transport layer services: multiplexing/ demultiplexing reliable data transfer flow control congestion control learn about transport layer protocols in the Internet: UDP: connectionless transport TCP: connection-oriented transport TCP congestion control
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Transport Layer 3-3 Transport services and protocols
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Transport Layer 3-4 Transport services and protocols provide logical communication between app processes running on different hosts transport protocols run in end systems send side: breaks app messages into segments , passes to network layer rcv side: reassembles segments into messages, passes to app layer more than one transport protocol available to apps Internet: TCP and UDP application transport network data link physical application transport network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical l o gi c a e n d - t r s p
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Transport Layer 3-5 Transport vs. network layer network layer: logical communication between hosts transport layer: logical communication between processes relies on, enhances, network layer services Household analogy: 12 kids sending letters to 12 kids processes = kids app messages = letters in envelopes hosts = houses transport protocol = Ay ş eand±Bü lent network-layer protocol = postal service
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Transport Layer 3-6 Internet transport-layer protocols reliable, in-order delivery (TCP) congestion control flow control connection setup unreliable, unordered delivery: UDP no-frills extension of “best-effort” IP services not available: delay guarantees bandwidth guarantees application transport network data link physical application transport network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical l o gi c a e n d - t r s p
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Transport Layer 3-7 Multiplexing/demultiplexing application transport network link physical P1 application transport network link physical application transport network link physical P2 P3 P4 P1 host 1 host 2 host 3 = process = socket delivering received segments to correct socket Demultiplexing at rcv host: gathering data from multiple sockets, enveloping data with header (later used for demultiplexing) Multiplexing at send host:
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Transport Layer 3-8 How demultiplexing works host receives IP datagrams each datagram has source IP address, destination IP address each datagram carries 1 transport-layer segment each segment has source, destination port number (recall: well-known port numbers for specific applications) host uses IP addresses & port numbers to direct segment to appropriate socket source port # dest port # 32 bits application data (message) other header fields TCP/UDP segment format
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Chapter3_Fall2011_IK - Chapter 3 Transport Layer Last...

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