2014-09-24

Computer Networks 2014-09-24

2014/09/24 Computer Networks Class Note

         circuit       hard-state      soft-state      stateless
         switching     switching       switching       routing
    stateful|---------------+--------------+---------------|stateless
          POTS     |       ATM           MPLS          Internet
                   |                                   (packet
               C/S | P/S                                switching)

• ISPs change part of backbone into MPLS

• store and forward

• when a packet arrived

  • store in a queue (waiting time)
  • waiting to be processed
  • queue for output port (waiting time)
  • transmitted (transmission time)
  • xxx (propagation time)

• how fast I can speak: transmission time

• jitter: latency variation

• throughput: how much you can transmit