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Section: Getting Data from Point A to Point B Section: Getting Data from Point A to Point B

Section: Getting Data from Point A to Point B - PowerPoint Presentation

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Uploaded On 2018-09-21

Section: Getting Data from Point A to Point B - PPT Presentation

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

networks router switched host router networks host switched circuit packet traffic network qos easy priority service link circuits quality

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Presentation Transcript

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