1. 广西医科大学
Computer Networking
网络课件
双语教学
模拟实验
计算机网络教研室

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

3. 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.

4. 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

5. An Ethernet LAN - a conceptual view:
Chapter 11 LAN Systems
An Ethernet LAN - a conceptual view:

6. Typically Installed of Ethernet LAN:
Chapter 11 LAN Systems
Typically Installed of Ethernet LAN:

7. 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.

8. Media commonly used in networks
Chapter 11 LAN Systems
Media commonly used in networks

9. 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

10. Characteristics of Ethernets
Chapter 11 LAN Systems
Characteristics of Ethernets

11. Chapter 11 LAN Systems

12. comparison of network hardware
Chapter 11 LAN Systems
comparison of network hardware

13. 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.

14. A token ring LAN as typically installed
Chapter 11 LAN Systems
A token ring LAN as typically installed

15. 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

16. 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.

17. 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.

18. Chapter 11 LAN Systems 11.8 Wireless LANs IEEE802.11 -802.11b -802.11ag
Wireless Security Issues
Bluetooth
HiperLAN2

19. Network Attached Storage (NAS)
Chapter 11 LAN Systems
NETWORK STORAGE：
Network Attached Storage (NAS)

20. Chapter 11 LAN Systems
Storage Area Networks (SAN)

21. Chapter 11 LAN Systems Fiber Channel：
Making fiber channel a good choice for disaster recovery as well.

22. 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 √
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23. 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 √
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24. Exercises Chapter 11 LAN Systems 课后习题
a uses a modulation technique that handles high data rates. It is called （　　 ）. A √
A、 OFDM ×
B、 DSSS ×
C、 QAM ×
D、 FHSS
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25. Exercises Chapter 11 LAN Systems 课后习题
4. The main disadvantage to a is that （　　 ）. C ×
A、 it is slower than other technologies ×
B、 it is not backward compatible with b products √
C、 it shares the same band with cordless phones and microwaves ×
D、 it is less secure than other wireless standards
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26. 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 √
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27. 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

28. 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

29. 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 but offers greater ____________ and more flexibility in topology.
fault tolerance
Answer

30. 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

31. Exercises Chapter 11 LAN Systems 课后习题
16. Token ring follows IEEE standards and uses token passing on a ring. __________ follows the IEEE standards using CSMA/CD on a bus.
Ethernet
Answer
17. Most wireless LANs today use radio technology based on the ___________ standards.
IEEE
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

32. Chapter 11 LAN Systems
Thank You !