Partial route procedure
The store and forward (engl. Store and forward ) is a technique of data transmission (e.g., as a in the information via an intermediate station router ) to be sent, which stores the data and forwards it at a later time to the final destination or a further intermediate station . The intermediate station checks the integrity of the data before they are forwarded using the CRC checksum belonging to the individual data units ( frames ) . If the data packet consists of several parts (fragments), it is put together (reassembled) before the integrity check.
This technology is generally used in networks that do not require permanent connectivity to the same (e.g. FidoNet , MausNet , Packet Radio ) or in which a high degree of mobility (e.g. Short Message Service ) is required.
This technique can only delay-tolerant networks (English delay tolerant networks -. DTN) are applied. Real-time systems as well as audio-visual communication systems such as streaming media or internet telephony can only be implemented to a limited extent due to the delays associated with this method. They therefore prefer to use so-called cut-through methods that dispense with the integrity check described above. In favor of the resulting higher performance, a higher error rate during transport and the correct reassembly of the data segments is accepted. The reverse is true for the partial route. There are mixed forms between the two methods.
literature
- Christian Scheideler: Universal Routing Strategies for Interconnection Networks. Springer Verlag, Berlin / Heidelberg 1998, ISBN 3-540-64505-5 .
- Andreas Bertsch: Digital Signatures. Springer Verlag, Berlin / Heidelberg 2002, ISBN 978-3-642-62681-4 .
- Wolfgang Riggert: Computer Networks. 5th updated edition, Carl Hanser Verlag, Munich 2014, ISBN 978-3-446-44204-7 .
- Ernst Schawohl: Cisco Networking Academy Program - 3rd and 4th semesters. 3rd edition, Verlag Markt + Technik, Munich 2004, ISBN 978-3-8272-6649-1 .
- Dirk Traeger: LAN practice of local networks . Springer Fachmedien, Berlin / Heidelberg, ISBN 978-3-519-06189-2 .