Notes_4 - INTERNETWORKING NOTES 4.0 ETHERNET ETHERNET FACTS...

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INTERNETWORKING NOTES 4.0 ETHERNET ETHERNET FACTS Ethernet is the most popular networking architecture for LANs. It offers high performance at a low cost and is easy to install and manage. The following table describes various details about Ethernet. TOPOLOGY Ethernet uses one or more of the following networking topologies: Physical bus, logical bus Physical star, logical bus Physical star, logical star NETWORKING DEVICES Devices used on Ethernet networks include: NICs with transceivers Hubs Switches Routers TRANSMISSION MEDIA Ethernet supports the following cable types: Unshielded twisted-pair cables (UTP) with RJ-45 connectors. This is the most common transmission medium used for Ethernet. Fiber optic, most commonly used in high-speed applications such as servers or streaming media. Coaxial for older Ethernet implementations (often called thinnet or thicknet networks). MEDIA ACCESS METHOD Ethernet uses a contention-based media access method called Carrier Sense, Multiple Access/Collision Detection (CSMA/CD). Devices use the following process to send data. Because all devices have equal access ( multiple access ) to the transmission media, a device with data to send first listens to the transmission medium to determine if it is free ( carrier sense ). If it is not free, the device waits a random time and listens again to the transmission medium. When it is free, the device transmits its message. If two devices transmit at the same time, a collision occurs. The sending devices detect the collision ( collision detection ) and send a jam signal to notify all other hosts that a collision has occurred.
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  • Spring '16
  • Crossover Cable, uplink port, straight-through cable

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