review of network tech

  • types of network

LAN WAN -- figures /performances see the difference

  • curcuit ->packet swithcing

store-and-forward

  • 2 alternative approaches to transmit packets

virtual curcuit  :Telephone system

datagram  :Postal system

  • virtual curcuit

route is established;store-and-forward sheme;vc number need to be carried by a packet

intermediate nodes contain a table created during route establishment

  • datagram

independent entity, no garantee; route dynamically decide the next node

out of order; a node crashes queued packets lost; duplicate

faster,flexible,handle congestion/failed links

  • delays
时间： 2024-11-07 23:06:56

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