Hub v.s. Switch Qualnet Exercise 1.

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Presentation transcript:

Hub v.s. Switch Qualnet Exercise 1

UTP (Unshielded Twisted Pair) What is Hub (集線器) A hub is used in a wired network to connect Ethernet cables from a number of devices together. UTP (Unshielded Twisted Pair)

星狀架構

UTP (Unshielded Twisted Pair) What is Switch (交換機) A switch is used in a wired network to connect Ethernet cables from a number of devices together. UTP (Unshielded Twisted Pair)

What is Switch Switches keep traffic between two devices from getting in the way of your other devices using the same network.

Hub v.s. Switch Safety Concern Management Concern Efficiency Concern Switch > Hub Management Concern SNMP: Simple Network Management Protocol Efficiency Concern No collision Cost Concern Hub > Switch

Qualnet Practice New scenario Add 4 devices and 1 hub in the canvas, and link them together Add 2 CBR flows Run and See Analyze the results Application->CBR Server-> Throughput Change hub to switch Compare the results

Network Topology Items to send: 0 Item size: 1200 Bytes Interval: 0.1MS Start Time: 1S End Time: 5S Throughput ? HUB Items to send: 0 Item size: 1200 Bytes Interval: 0.1MS Start Time: 1.1S End Time: 5.1S

Question Make the animation slow down, does the 2 CBRs appear at the same time?

Question What’s the throughput, if 2 CBR’s interval is 0.1 S ? Hub Lab What if 2 CBRs start at the same time(1sec) What’s the throughput, if Hub is 10 M ? What’s the throughput, if only one CBR exists?

Change Hub to Switch MAC Protocol-> switched Ethernet