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Chapter 11 LAN Systems DI 1 2 3 The first section Exercises Online lecture

Chapter 11 LAN Systems 11.1 INTRODUCTION This chapter examines the different LAN systems described in the IEEE 802 standards and the protocols that were introduced in Chapter 10. www.gxmu.edu.cn

Chapter 11 LAN Systems 11.2 ETHERNET Ethernet is based on the IEEE802.3 standard. In its basic form, it operates on a bus topology at 10 Mbps using baseband transmission with Manchester data coding. ——Xerox Corporation Palo Alto Research Center www.gxmu.edu.cn

An Ethernet LAN - a conceptual view: Chapter 11 LAN Systems An Ethernet LAN - a conceptual view: www.gxmu.edu.cn

Typically Installed of Ethernet LAN: Chapter 11 LAN Systems Typically Installed of Ethernet LAN: www.gxmu.edu.cn

Chapter 11 LAN Systems Media commonly used in networks: One of the most important decisions that can be made when constructing a network is the type of medium that is used to connect the nodes. www.gxmu.edu.cn

Media commonly used in networks Chapter 11 LAN Systems Media commonly used in networks www.gxmu.edu.cn

Chapter 11 LAN Systems Most Commonly Ethernet: 10Base-5:Thick Ethernet 10Mbps 500 meters 10Base-2:Thin Ethernet 10Mbps 185 meters 10Base-T:UTP 10Mbps 100 meters 10Base-F:Optical Fiber 500 meters Gigabit Ethernet:1000Base-X 100Base-T:Fast Ethernet (100Base-TX;100Base-FX;100Base-T4) 10Gigabit Ethernet: 10000Mbps www.gxmu.edu.cn

Characteristics of Ethernets Chapter 11 LAN Systems Characteristics of Ethernets www.gxmu.edu.cn

Chapter 11 LAN Systems www.gxmu.edu.cn

comparison of network hardware Chapter 11 LAN Systems comparison of network hardware www.gxmu.edu.cn

Chapter 11 LAN Systems 11.3 TOKEN RING A token ring network is almost collision free, because the waiting time before the next token can be transmitted is calculable. www.gxmu.edu.cn

A token ring LAN as typically installed Chapter 11 LAN Systems A token ring LAN as typically installed www.gxmu.edu.cn

Chapter 11 LAN Systems 11.4 The Fiber Distributed Data Interface Standard Fiber Distributed Data Interface : SMF and MMF Copper distributed data interface: uses only STP or UTP CAT 5 cabling www.gxmu.edu.cn

Chapter 11 LAN Systems 11.5-6 ARCNET and LOCALTALK Attached Resource Computer Network are established with either a bus or star topology using UTP, coaxial cable ,or optical fiber media. www.gxmu.edu.cn

Chapter 11 LAN Systems 11.7 Asynchronous Transfer Mode The ATM protocol stack is made up of protocols at layers 1,2,and 3 of the OSI model. www.gxmu.edu.cn

Chapter 11 LAN Systems 11.8 Wireless LANs IEEE802.11 -802.11b -802.11a -802.11g 802.11 Wireless Security Issues Bluetooth HiperLAN2 www.gxmu.edu.cn

Network Attached Storage (NAS) Chapter 11 LAN Systems NETWORK STORAGE： Network Attached Storage (NAS) www.gxmu.edu.cn

Chapter 11 LAN Systems Storage Area Networks (SAN) www.gxmu.edu.cn

Chapter 11 LAN Systems Fiber Channel： Making fiber channel a good choice for disaster recovery as well. www.gxmu.edu.cn

Exercises Chapter 11 LAN Systems 课后习题 1. A separate network that is physically removed from, but is connected to a LAN and that houses data immediately accessible to users is called a （　　 ）. D × A、 VAN × B、 NAS × C、 VPN D、 SAN √ Reset Next Show Answer

Exercises Chapter 11 LAN Systems 课后习题 2. A wireless standard used to connect short range devices is called （　　 ）. D × A、 Wi-Fi × B、 HiperLAN2 × C、 Shortrun D、 Bluetooth √ Reset Next Show Answer

Exercises Chapter 11 LAN Systems 课后习题 3. 802.11a uses a modulation technique that handles high data rates. It is called （　　 ）. A √ A、 OFDM × B、 DSSS × C、 QAM × D、 FHSS Reset Next Show Answer

Exercises Chapter 11 LAN Systems 课后习题 4. The main disadvantage to 802.11a is that （　　 ）. C × A、 it is slower than other technologies × B、 it is not backward compatible with 802.11b products √ C、 it shares the same band with cordless phones and microwaves × D、 it is less secure than other wireless standards Reset Next Show Answer

Exercises Chapter 11 LAN Systems 课后习题 5. Which of the following Ethernets normally uses optical fiber as the medium?（　　 ）. D × A、 10Base-5 × B、 10Base-2 × C、 10Base-T D、 10Base-F √ Reset Next Show Answer

Exercises Chapter 11 LAN Systems 课后习题 6. The short name for an Ethernet operating at 10 Mbps, baseband, over UTP wire, normally for a distance of only 100 meters per segment is _________. 10Base-T Answer 7. 10Base-F uses __________ for the medium as an alternative to UTP. optical fiber Answer 8. The Ethernet technology commonly used as the backbone in many networks is _______________. Gigabit Ethernet Answer

Exercises Chapter 11 LAN Systems 课后习题 9. A _________ hub reads the destination address of the packet and sends it to the proper port. switching Answer 10. A ______________ hub acts like a pipe through which data flow, allowing packets to go from one segment of the network to another. shared medium Answer 11. _____________________________ is a device or group of devices that reside on a LAN and are dedicated to storage. Network Attached Storage (NAS) Answer

Exercises Chapter 11 LAN Systems 课后习题 12. Individual computers on a Token Ring network attach to a ________________________, which is similar to, though more sophisticated than, a hub in an Ethernet network. multistation access unit (MAU) Answer 13. The token passing technique defined by FDDI is similar to the one defined by IEEE 802.5 but offers greater ____________ and more flexibility in topology. fault tolerance Answer

Exercises Chapter 11 LAN Systems 课后习题 14. The _______ standard describes the transmission of signals at 100 Mbps on an optical fiber cable configured in counter-rotating token rings. FDDI Answer 15. FDDI is implemented over optical fiber. _____________________________________ is very similar but uses only shielded twisted pair or unshielded twisted pair cabling. Copper Distributed Data Interface (CDDI) Answer

Exercises Chapter 11 LAN Systems 课后习题 16. Token ring follows IEEE 802.5 standards and uses token passing on a ring. __________ follows the IEEE 802.3 standards using CSMA/CD on a bus. Ethernet Answer 17. Most wireless LANs today use radio technology based on the ___________ standards. IEEE 802.11 Answer 18. _________ is a wireless standard that is used to emit signals over a relatively short range. It is a royalty free, open-specification technology. Bluetooth Answer

Chapter 11 LAN Systems Thank You ! www.gxmu.edu.cn