CSE 461 Bittorrent A Joke PacketSwitched Networks Host A Router Host B Router Router Router Router Router Router What are some advantages of this Easy to set up and add nodes Scales well ID: 673966
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Slide1
Section:Getting Data from Point A to Point B
CSE 461Slide2
Bittorrent
A JokeSlide3
Packet-Switched Networks
Host A
Router
Host B
Router
Router
Router
Router
Router
RouterSlide4
What are some advantages of this?Easy to set up and add nodesScales well
Partitioned system means faults are localized
Many connections possible over the same line
What are some disadvantages?
Less
direct paths
Router processing power
needed
(or specialized hardware)
Packet-Switched NetworksSlide5
Packet-Switched Networks
Host A
Router
Host B
Router
Router
Router
Router
Router
RouterSlide6
Circuit-Switched Networks
Host B
Host A
Host P
Host QSlide7
Circuit-Switched Networks
What are some advantages of this?Easy to keep networks separate and private
Consistent response time
Quality of Service
What are some
disadvantages
of this?
Doesn’t scale well
Takes work to set up new circuitsUnused network capacity commonSlide8
Early Circuit-Switched NetworkSlide9
Virtual circuitsConnection-oriented communicationLike circuits, but delivered over packets
Examples?TorTCP
Multiprotocol Label Switching
Circuits in packet-switched networks?Slide10
Virtual circuit protocolDeveloped by CiscoFor use inside networks
Works on the link layerLabels added to link layer frames
Multiprotocol Label Switching (MPLS)Slide11
Routers very quickly look at, remove, and add labelsRouting decisions using labelsTraffic class field determines QoS priority
Why do this instead of just using IP addresses?Why is this scheme problematic?
MPLS LabelsSlide12
QoS (Quality of Service)
Traffic can be routed according to priority
Why might we want to prioritize traffic
differently?
Traffic can also be rerouted dynamically
according to network conditions
Examples?
How could
QoS
be a problem?Slide13
Net Neutrality