15 - guarantee to deal with – datagram duplication –...

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IP datagrams Service paradigm, IP datagrams, routing, encapsulation, fragmentation and reassembly
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Internet service paradigm TCP/IP supports both connectionless and connection-oriented services fundamental delivery service is connectionless at the Internet layer optional reliable connection-oriented service is layered on top of this at the transport layer
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IP datagrams Packets of data are sent across multiple physical networks via routers Internet protocols define a universal virtual packet - the IP datagram The amount of data carried in a datagram is not fixed and is determined by an application
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Routers and routing tables Each router forwards a virtual packet by using a local routing table Each entry is: destination address mask next hop IP address of a router or Deliver direct Then does address resolution
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Example routing table
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Best-effort delivery IP attempts best effort delivery and does not
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Unformatted text preview: guarantee to deal with: – datagram duplication – delayed or out of order delivery – corruption of data – datagram loss • These issues are dealt with other protocol layers IP datagram header format Encapsulation • When an IP datagram is sent across a physical network it is placed in the data area of a frame and the frame type is set to IP MTU and datagram size • Maximum transmission unit - max of data that a frame can carry on a given network • A packet may have to cope with different MTU sizes as is passes over an internet Fragmentation • A datagram that is larger than MTU is fragmented into smaller datagrams Reassembly • Is done at the final host – routers require less state information – fragments can take different routes • Header fields indicate when the data is a fragment and also where it belongs • Whole datagram is lost if any fragment is lost...
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This note was uploaded on 08/14/2011 for the course ELECTRONIC G52CCN taught by Professor Professorgail during the Spring '09 term at Uni. Nottingham.

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15 - guarantee to deal with – datagram duplication –...

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