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
review of network tech
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