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2. LAN 2. LAN 3. K LAN 1.Token Ring ii. Ethernet iii. FDDI iv. LAN v. (VLAN) i.4. 5. LAN 3. ; A 4. LAN ; ;E . . 5. Token Ring ( )(1/2) 1960, IBM 802.5 (ring) (token) 4Mbps 6Mbps 100Mbps 6. Token Ring ( )(2/2) 250 (IBM 1) o Ethernet Ethernet 7. Ethernet(1/2) K Robert Metcalfe DavidBoggs OSI Xerox, INTEL DEC Ethernet 802.3 Ethernet : Shared Ethernet-Switched Ethernet -Fast EthernetGigabit Ethernet-10 Gigabit Ethernet 8. Ethernet(2/2) Shared Ethernet: Ethernet (10b/sec ) Switched Ethernet: CSMA/CD , Fast Ethernet: , , / Gigabit Ethernet: Gigabit Ethernet Fast Ethernet. 10 Gigabit Ethernet 9. Ethernet 2 : (thin thick) : bit Manchester 2.5 km(1 500 m) 10. 802.3 : a)A 7 byte 10101010b)Byte 10101011c) , . 2 6 bytes.d) : 802.3 64 bytes 46 bytes .e) (checksum): 32 bits . . . 11. MAC address MAC 802.3 Ethernet 6 bytes Ethernet bytes MAC . 12. : , 0 1 . , . 0,1,2 3 . ( 0.25), 0 23-1. , 0 2-1 . 10 , 1023 . 16 . 1/16! . 13. FDDI (Fiber Distributed Data Interface)(1/2) ANSI 100 Mbps, . FDDI (Fiber Distributed Data Interface ) , . (.) . : 1. (synchronous) real-time 2. (asynchronous) . (S-frames) (A-frames). 14. FDDI (Fiber Distributed Data Interface)(2/2) : SA(Synchronous Allocation): (S-frames). . TTRT(Target Token Rotation Time): . AMT(Absolute Maximum Time): TTRT . : TRT(Token Rotation Timer): . THT(Token Holding Timer): . , . 15. LAN IEEE 802.11 IEEE (WLAN , Wireless Local Access Network) 802.3 (Ethernet, ) . 802.11 WiFi WiFi Alliance, IEEE, 802.11. 802.11 OSI, (PHY, Physical Layer) (MAC, Medium Access Control). 802.11 Ethernet. 802.11 OSI. 16. 802.11 802.11802.11b802.11a802.11g19971999199920032115454 IR/ FHSS/ DSSSCCKOFDMCCK & OFDM 1, 2 Mbps1, 2, 5.5, 11Mbps6, 9, 12, 18, 24, 36, 48, 54MbpsOFDM: 6, 9, 12, 18, 24, 36, 48, 54Mbps CCK: 1, 2, 5.5, 11Mbps5.15 - 5.35GHz 5.425 - 5.675GHz 5.725 - 5.875GHz2.4 2.497 GHz~35 m~38 m (Mbps) 915MHz, 2.4 2.497 GHz 2.4GHz, 5.2GHz 850nm 900nm ~20 m~38 mFHSS: Frequency-hopping spread spectrum CCK: Complementary Code Keying OFDM: Orthogonal frequency-division multiplexing 17. (1/2) IBSS, IndependentBasic Service Set Peer-to-Peer Ad-Hoc 18. (2/2) Infrastructure Mode 1.Infrastructure Basic Service Set2.Extended Service Set, ESS 19. 802.11 : o (AP, Access Point) o o (Repeater) o (Bridge) o WDS (Wireless Distribution System) o o o o o o o o o o (MAC, Medium Access Control) 20. (VLAN) (). IEEE 802.1Q 21. LAN Ethernet Token Ring FDDI Ethernet Token Ring . , Ethernet Ethernet . , ATM ATM Ethernet