• Review: – Ethernet •What is the MAC protocol in Ethernet? – CSMA/CD – Binary exponential backoff •Is there any relationship between the minimum frame size and the network speed? •What is the difference between fast Ethernet and Ethernet besides speed? Why such a change is made?
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Review: –Ethernet What is the MAC protocol in Ethernet? –CSMA/CD –Binary exponential backoff Is there any relationship between the minimum frame size and.
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Transcript
• Review:– Ethernet
• What is the MAC protocol in Ethernet?– CSMA/CD
– Binary exponential backoff
• Is there any relationship between the minimum frame size and the network speed?
• What is the difference between fast Ethernet and Ethernet besides speed? Why such a change is made?
• Interconnecting LANs– Why?
• When too many machines are in a single LAN, the bandwidth may not be sufficient to support all the machines -- need to partition one LAN into multiple LANs to get higher aggregate throughput.
• When the area is too big for a single LAN (e.g. 5km for Ethernet)? We can create multiple collision domains and interconnect the LANs.
• For security reasons. Ethernet cards support a promiscuous mode which allows a station to get all frames received.
• Internetworking at different levels• repeaters: physical layer, copy signals from one
network to another network.
• bridges: data link layer, (selectively) copy frames from one network to another network.
• routers or gateways: network layer, routing and forwarding.
• application gateway or converter: application layer. translate between OSI mail and SMTP mail
• Brouter: bridge + router
Interconnecting with hubs• Backbone hub interconnects LAN segments• Extends max distance between nodes• But individual segment collision domains become one large