1. 1 Data Transmission and Computer Networks Local Area Networks

2. 2 LAN Topics  LAN Topology  LAN Transmission Media & Devices  LAN Architecture  LAN Medium Access Protocol  LAN Standards

3. 3 Wired LAN

4. 4 Wired LAN Topology 1. Star: 2. Ring:

5. 5 Wired LAN Topology: 3. Bus: Bus extender Bus

6. 6 Wired LAN Topology: 4. Hub: 5. Hub/Tree:

7. 7 Wired LAN Transmission Media: Twisted Pair : UTP & STP Coaxial Cable : Broadband, Thick & Thin Fiber Optics cables

8. 8 Wired LAN Twisted Pair Transmission Media: Twisted Pair Types : UTP & STP LAN Twisted pair media standards : – 10 Base T – 100 Base TX – 100 Base T4 – 1000 Base T – 1000 Base CX

9. 9 Wired LAN Fiber Transmission Media: Fiber Cable : Multimode, Single Mode LAN Fiber Cable standards : – 10 Base F : 10 Base FP, 10 Base FL, 10 Base FB – 100 Base FX – 1000 Base SX – 1000 Base LX Connector SC Cable with Connector ST

10. 10 Wired LAN Coaxial Transmission Media: Coaxial Cable Types : Broadband, Thick, Thin LAN Coaxial Cable standards : – 10 Broad 36 – 10 Base 5 – 10 Base 2

11. 11 Wired LAN Standards Comparison

12. 12 Wired LAN Standards Comparison

13. 13 Wired LAN Transmission Media: 10BASE T Twisted Pair Controller Hub

14. 14 Wired LAN Transmission Media: 1. Twisted Pair (10BASE T): HUB Repeater electronics Rx/Tx circuits موصل نوع MAU للاسلاك المزدوجة STP في الشبكات الحلقية موصل نوع صدفة D-shell كبل ونهاية RJ-45 الاسلاك المزدوجة

15. 15 Wired LAN Transmission Media: Transceiver cable Transceiver + Controller 10BASE 2 BNC T Connector Controller Vampire tap Core 10BASE 5 Transceiver

16. 16 Wired LAN Transmission Media: 2. Baseband Coaxial Cable: ii. Thick wire (10BASE 5): 0.5” coax Transceiver i. Thin wire (10BASE 2): Terminator 0.25” coax BNC T Connector

17. 17 Wired LAN Devices Network Interface Card (NIC) Hub Switches Bridges Router Gateway Repeater Bridge المجم ع Hub القناة الواردة Input Line

18. 18 Wired LAN Devices Hub Device : Stacked, Stand Alone & Modular

19. 19 Wired LAN Devices Switch Device : Intelligent Hub

20. 20 Wired LAN Devices Router : Connects WAN with LAN

21. 21 Wired LAN Devices Network Interface Card (NIC): Irrespective of the transmission media being used, the communications controller card within each DTE comprises the following: A medium access controller (MAC) unit: It is responsible for: Encapsulation and de- encapsulation of frames. Error detection. Implementation of MAC algorithm. RAM: It allows MAC unit to receive and transmit frames at he high link bit rate. RG45 منفذ BNC منفذ AUI

22. 22 LAN ARCHITECTURE LAN Architecture includes: LAN Model LAN Layers LAN Data Link Sub layers and Protocols: Logical Link Control LLC sub-layer ( to do data link tasks e.g. error control..) Medium Access Control MAC sub-layer (to allow sharing LAN medium)

23. 23 LAN IEEE REFERENCE MODEL

24. 24 LAN Layers data units

25. 25 LLC Packet Data Unit PDU & MAC Frame DSAP: Destination Service Access Point SSAP: Source Service Access Point