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Ethernet Architecture Facts Topology Media Access Method Physical topologies--bus, star, cascading star Logical topology--bus (physical bus, logical bus; physical star, logical bus), star (physical star, logical star) 1.CSMA/CD--Carrier Sense, Multiple Access/Collision Detection (contention). Devices use the following process to send data. Because all devices have equal access to the transmission media (multiple access), a device with data to send first listens to the transmission medium to determine if it is free (carrier sense). 2.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. 3.If two devices transmit at the same time, a collision occurs. The sending devices detect the collision (collision detection) and send a jam signal. 4.Both devices wait a random length of time before attempting to resend the original message (called backoff). Transmissi on Media Frame Type Physical Address •Thick coaxial, thin coaxial, twisted-pair, fiber-optic The most common Ethernet implementations use unshielded twisted-pair cables (UTP). Each cable consists of eight wires, twisted into four pairs. UTP cables are classified by categories: Cat3, rated up to 10 Mbps •Cat4, rated up to 16 Mbps •Cat5, rated up to 100 Mbps •Cat5e, rated up to 1,000 Mbps (gigabit) UTP cables are connected with RJ-45 connectors. •Frame size = 64 to 1518 bytes (this is the same for all Ethernet standards) Four frame types are supported: Ethernet 802.3--This frame type is the original Ethernet frame type. •Ethernet 802.2--This frame type accommodates standards set by the IEEE 802.2 committee related to the logical link control (LLC) sublayer. It is a more current frame type than 802.3. •Ethernet II--This frame type provides the ability to use TCP/IP as a transport/network layer protocol. Other Ethernet frame types operate strictly with IPX/SPX as a transport/network layer protocol. •Ethernet SNAP--This frame type (SubNetwork Address Protocol) is an enhanced version of Ethernet 802.2 that allows for greater compatibility with other network architectures such as Token Ring. This frame type also supports TCP/IP. The MAC address (also called the burned-in address) is used as the Data Link layer physical device address. The MAC address is a 12-digit hexadecimal number. Each digit ranges from 0-9 or A-F. The MAC address FFFFFFFFFFFF is the broadcast address. Packets addressed to the broadcast address will be processed by all devices.
Ethernet Standards Category Standard Bandwidth Cable Type Maximum Segment Length Ethernet Fast Ethernet 10Base5 10 Mbps Coaxial (thicknet) 500 meters 10Base2 10 Mbps Coaxial (thinnet) 185 meters 10BaseT 100BaseTX 100BaseT4 100BaseFX Bandwidth - jedinica informacije (bit) u jedinici vremena sekunda), bps (brzina toka, širina propusnog opsega) 10 Mbps (half duplex) 20 Mbps (full duplex) 100 Mbps (half duplex) 200 Mbps (full duplex) 100 Mbps (half duplex) 200 Mbps (full duplex) 100 Mbps (half duplex) 200 Mbps (full duplex) Twisted pair (Cat3, 4, or 5) Twisted pair (Cat5) Twisted pair (Cat5) Fiber optic 100 meters 100 meters 100 meters 412 meters (half duplex multimode cable) 2,000 meters (full duplex singlemode cable) 1000BaseSX (short) 1,000 Mbps (half duplex) 2,000 Mbps (full duplex) Fiber optic 220 to 550 meters depending on cable quality Gigabit Ethernet 1000BaseLX (long) 1000BaseCX (short copper) 1,000 Mbps (half duplex) 2,000 Mbps (full duplex) 1,000 Mbps (half duplex) 2,000 Mbps (full duplex) Fiber optic Special copper 550 to 5,000 meters depending on cable quality 25 meters, used within wiring closets 1000BaseT 1,000 Mbps (half duplex) 2,000 Mbps (full duplex) Twisted pair (Cat5e) 100 meters
Page 1 and 2: Raunarske mreže e i komunikacije (
Page 3 and 4: Raunarske mreže - Tipovi raunarski
Page 5: Mrežne topologija • Bus • Prst
Page 14: OSI referentni model You should be
Page 24 and 25: Bandwidth Bandwidth - jedinica info
Page 26 and 27: Throughput - protok • Odnosi se n
Page 29 and 30: Mrežni uredjaji Host — mrežni
Page 34 and 35: LAN uredjaji u razliitim itim topol
Page 36 and 37: Switch Koriste se kao mjesto kon
Page 40 and 41: Tok podataka kroz LAN • Gornja tr
Page 42: Tok podataka kroz LAN • Fiziki sl

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