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Ethernet Evolution and Standards
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You should be very familiar with how CSMA/ CD operates for Ethernet, which includes Fast Ethernet and Gigabit Ethernet Remember that there is no prioritization for accessing the Ethernet wire Less important for the exam are the frame encapsulations for Ethernet II and 8022/8023; however, you should be able to compare and contrast the two frame types
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Straight-through unshielded twisted pair (UTP) cables are used for DTE-to-DCE connections, where a DTE is a PC or router and a DCE is a switch or hub Crossover cables are used for DCE-to-DCE or DTEto-DTE connections In a crossover cable, pins 1 and 3, and pins 2 and 6 are crossed Don t be surprised if you have to match up the cabling type you need to use based on the two devices that you need to connect together Fiber-optic cables are best used in environments that have EMI and/or RFI or for connecting components over long distances Be familiar with the different Ethernet implementations, such as 10BaseT, 100BaseTX, and 1000BaseLX support, including the distances they can span and the kinds of connectors at the ends of their cables GBICs are used to provide an option of interface connectors for a Gigabit Ethernet interface
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You will need to be able to convert binary to decimal (and vice versa), binary to hexadecimal (and vice versa), and decimal to hexadecimal (and vice versa) It would be wise to memorize Tables 3-5 and 3-7 You should know how long a MAC address is, 48 bits; the two components of a MAC address; and what a local broadcast MAC address looks like Remember that routers don t propagate local broadcasts and that you need unique MAC addresses in the same broadcast domain
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This chapter focused on the Ethernet LAN technology CSMA/CD is used to implement Ethernet Ethernet is a shared medium When a device wants to transmit, it must first listen to the wire to determine whether a transmission is already occurring If two devices try to send their transmissions simultaneously, a collision occurs When this happens, a jam signal is created and the two devices back off a random period before trying again There are two versions of Ethernet: IEEE 8022/3 and Ethernet II (or DIX) 8022 defines the LLC (software) and 8023 defines the MAC (hardware) 8022 uses a SAP or SNAP field to designate the layer 3 encapsulated protocol Ethernet II doesn t have any sublayers and doesn t have a length field; it has a type field instead to designate the encapsulated protocol Computers deal with numbers in binary: strings of 0s and 1s A 1 in a bit position turns on an equivalent decimal value, which is 2 to the power of the bit position MAC addresses, however, are represented in hexadecimal Hexadecimal numbers range from 0 through F, where hexadecimal F is 15 in decimal When all bit positions in a MAC address are enabled FF:FF:FF:FF:FF:FF this represents a local broadcast Cabling types used in Ethernet networks include copper and fiber Copper is used to connect components across short distances, and fiber is used to connect them across long distances or when interference, such as EMI, can cause problems with signals traversing a copper wire The most common copper implementation for Ethernet is UTP Category 5 Two kinds of UTP connections are used: straightthrough and crossover A straight-through cable is used from a switch to either a router or PC A crossover connection is used between switches, hubs, switches and hubs, a router and PC, two routers, or two PCs
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3: Layer 2 LAN Technologies
TWO-MINUTE DRILL
Ethernet Evolution and Standards
CSMA/CD is used to send information in an Ethernet shared medium CSMA/CD senses the wire and then transmits the data; if a collision
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