Transport Layer - Slides (R1)

Transport Layer- - CSCI 232 CSCI 232 Computer Networking Transport Layer George Blankenship Transport Layer George Blankenship 1 Lesson Outline

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SCI 232 CSCI 232 Computer Networking: Transport Layer George Blankenship Transport Layer George Blankenship 1
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Lesson Outline • Concepts – Transport service entrance ddressing Addressing – Connection Oriented/Connectionless – Flow control and error control •T C P • UDP Transport Layer George Blankenship 2
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Transport Layer • Peer transport layer connects end systems • Uses network layer to move TPDU upplies data transportation service to • Supplies data transportation service to applications • Applications known by SAPs Transport Layer George Blankenship 3
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Transport Service Entrance • Upper level requests service through the ansport service entrance transport service entrance • Control requests t h t t t i – attach to transport service – detach from transport service • Data requests – send data unit – receive data unit Transport Layer George Blankenship 4
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Requests • Blocking requests – requester held until request completes (“as subroutine”), single thread operation – timers must be part of service on locking requests • Non-blocking requests – requester progresses after request – requester must check status of request quester may have multiple requests outstanding Transport Layer George Blankenship 5 requester may have multiple requests outstanding
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Asymmetric Protocol • Two different protocol state machines erver • Server – Dormant state is “waiting for a request” – Accepts requests (open requests) from client • Client – Dormant state is “not involved in a communication in any way” – initiates a dialog (open request) Transport Layer George Blankenship 6
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Addressing • Application requests data transport to a target end system arget end system identified by an address Target end system identified by an address – target application (user) – transport peer – target host – target network ser::tsap::nsap Transport Layer George Blankenship 7 user::tsap::nsap
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This note was uploaded on 09/03/2010 for the course CS 232 taught by Professor Susan during the Summer '09 term at GWU.

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Transport Layer- - CSCI 232 CSCI 232 Computer Networking Transport Layer George Blankenship Transport Layer George Blankenship 1 Lesson Outline

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