1. LANs provide advantages like simple and inexpensive connections, support for multiple media protocols, flexibility for any-to-any connections, support for new applications, and ability to grow easily. 2. Basic LAN components include servers, clients, switches, hubs, and routers connected via media like Ethernet cables or WiFi. Firewalls separate the LAN from outside networks like the WAN and Internet. 3. The document discusses LAN topology options like bus, ring, star, and star-bus as well as cabling standards and network adapters. It also covers topics like IP addressing, DHCP, DNS, and basic network configuration in Windows.

1. 1
Basic Computer Network

2. LAN Overview
LANs were created to save time, money, and enable users to
share information and resources more easily. Some advantages
that LANs provide include
Simple and inexpensive connections
Support for multiple media protocols
Flexibility to provide any-to-any connections
Support for new applications
Ability to grow easily
2
Basic Computer Network

3. LAN
LAN WAN
DMZ
Outside
Data network
Firewall Gateway
resources
Hub/Switch
Media
Server
Printer
PC Workstation/Clients
3
Basic Computer Network

4. LAN Media
Thinnet
Thicknet
Fiber Optic
4
Basic Computer Network

5. LAN Media
STP : Shielded Twisted Pair RJ-45
UTP : Unshielded Twisted Pair
5
Basic Computer Network

6. LAN Adaptor
RJ-45 connector
BNC connector
NIC : Network Interface Card
PCI : Peripheral Component Interconnect Cards
6
Basic Computer Network

7. MAC Addressing
• Aka Hardware address
• “Ethernet” (or 802.3) networks specify a 48-bit
physical “MAC address”
– 00-00-f8-75-5b-a6 -- Unique identifier for the network
interface card (NIC)
– Address ranges are assigned to specific vendors e.g.,
“00-00” is Digital Equipment corp.
– To find vendors MAC addresses
http://coffer.com/mac_find/
• Specific MAC address that means “broadcast”
– ff-ff-ff-ff-ff-ff (All 1s)
7
Basic Computer Network

8. LAN Connecting Devices
Hub
Switch
8
Basic Computer Network

9. HUB
• HUBs: F F
F F F F F F
• F ˈ 2 1 "Passive HUBs F F
F F F 2 Active HUBs F F
F F F
HUBs F 1 OSI Model
9
Basic Computer Network

10. Switch
• Switches: F F HUBs F
F F F F F
F
• Hubs F F
F F F
Switches F F 2 OSI Model ( F
LANs Topology )
10
Basic Computer Network

11. Router
• Router: F F F F F
F LANs – WANs WANs – WANs
F F Router F
F F F F F (Internetworking
Device)
• F F F Router F IP F
3 OSI Model
TOT’s NETWORK
11
Basic Computer Network

12. LAN Topologies
• Bus
• Ring BUS
• Star
• Star-Bus
STAR RING
12
Basic Computer Network

13. Star-Bus Topology
13
Basic Computer Network

14. ETHERNET
10 Mbps 100 Mbps 1000 Mbps 10 Gbps
F
F F Gigabit
F Gigabit
Fast Ethernet Ethernet system
......... Ethernet
system
IEEE system
IEEE
802.3
IEEE 802.3u 802.3z/802.3ab
IEEE 802.3ae
IEEE802.3
14
Basic Computer Network

15. F ETHERNET
Topology F
- F - F
F Cable
F F F
Thin Ethernet
10base2 10 Mbps 185 - 200 BUS Thin Coaxial
Cheapernet
10base5 10 Mbps 500 Thick Coaxial Thick Ethernet
Twisted Pair
10baseT 10 Mbps 100 STAR
(UTP)
10baseF 10 Mbps 2000 Fiber Optic
Twisted Pair
100baseT 100 Mbps ......... Fast Ethernet
(UTP)
15
Basic Computer Network

16. IP Address
Internet Protocol Address ˈ F F F F
F F F Hardware F
– F F F (Host Address)
– F F (Network Address)
• 32 bit F ˈ 4 F F F F F 0- 255
16
Basic Computer Network

17. 17
Basic Computer Network

18. IP Addresses – Class A
• Class A
– Start with binary 0
– All 0 reserved
– 01111111 (127) reserved for loopback
– Range 1.x.x.x to 126.x.x.x
– All allocated
• Private address 10.x.x.x
18
Basic Computer Network

19. IP Addresses – Class B
• Start with binary 10
– Range 128.x.x.x to 191.x.x.x
– Second Octet also included in network address
– 214 = 16,384 class B addresses
– All allocated
• Private address range
172.16.x.x – 172.31.x.x
19
Basic Computer Network

20. IP Addresses – Class C
• Start with binary 110
– Range 192.x.x.x to 223.x.x.x
– Second and third Octet also part of network address
– 221 = 2,097,152 class C addresses
– Near all allocated
• Private address range
192.168.x.x
20
Basic Computer Network

21. 21
Basic Computer Network

22. Dynamic Host Configuration Protocol
• DHCP Service F IP Address
F F F (Client) FF F F
F F F Client F
F F (Server) F Service F F
run F F Client F F F IP
F
22
Basic Computer Network

23. Domain Name
(Domain Name) ˈ
F (IP Address) ˈ
F F F
F F IP 202.44.204.33
" " ˈ www.nectec.or.th
F F F F F IP Address
F ˈ Lookup ʽ
ˈ (Domain Name) F Domain Name
Server
23
Basic Computer Network

24. F F
F Network
Windows 98 / ME
24
Basic Computer Network

25. setup windows 98/ME
Click My computer Properties
Network Interface Card
Network Interface Card
25
Basic Computer Network

26. setup windows 98/ME
• start
• Setting
• Control Panel
26
Basic Computer Network

27. setup windows 98
• ʽ Control Panel Network
27
Basic Computer Network

28. Network Configuration
1
2
28
Basic Computer Network

29. TCP/IP Properties : IP Address
29
Basic Computer Network

30. DNS Configuration
30
Basic Computer Network

31. • F F PC Network
F DOS Prompt F F ipconfig /all
31
Basic Computer Network

32. RUN F winipcfg
32
Basic Computer Network

33. F F
F Network
Windows XP / 2000
33
Basic Computer Network

34. Setup Windows XP / 2000
1. Icon My network Place F Properties
34
Basic Computer Network

35. 2. Local Area connection F Properties
35
Basic Computer Network

36. 3. Double Click Internet Protocol (TCP/IP)
36
Basic Computer Network

37. 4. Obtain an IP automatically, Obtain DNS server automatically
37
Basic Computer Network

38. Setup F Control Panel
Control Panel
38
Basic Computer Network

39. Double Click Network Connections
Double Click
Network
Connections
39
Basic Computer Network

40. Local Area Connection Properties
Click
Properties
40
Basic Computer Network

41. Internet Protocol (TCP/IP) ˁ Properties F
General F Obtain an IP address automatically Obtain DNS
server address automatically.
obtain an IP address
internet
Protocol(TCP/IP)
obtain DNS
Click Properties
41
Basic Computer Network

42. • F F PC Network
F DOS Prompt F F ipconfig /all
42
Basic Computer Network

43. F Ping
• F F F F
F F F ICMP
(Internet Control Message Protocol)
F F ˈ ICMP Echo
Reply ( F ˈ ICMP Echo Request)
• block ping F F Fire wall
F F F ˈ F F
F F
43
Basic Computer Network

44. ʽ command prompt F Ping
F IP address F F
44
Basic Computer Network

45. Wireless LAN
45
Basic Computer Network

46. F Wireless LAN
F Wireless LAN (Local Area Network) WLAN
ˈ F F F peer-to-
peer F F (station) F
F ˈ F F (point-
to-point) F (point-to-multi point)
F WLAN ˈ F F LAN
F ˈ F F
LAN F F
46
Basic Computer Network

47. F F
F F F F F
F F F F
F F F F FF
F F F F
47
Basic Computer Network

48. F F F
Wired LAN Network
Wireless LAN (Proprietary)
IEEE Standard ETSI Standard
IEEE 802.11 HiperLAN/1
HiperLAN/2
IEEE 802.11b (Wi-Fi) IEEE 802.11a (Wi-Fi5)
HiperACCESS
IEEE 802.11g (Wi-Fi)
IEEE: Institute of Electrical and Electronics Engineers
ETSI: European Telecommunications Standards Institute
48
Basic Computer Network

49. IEEE 802.11Specifications
802.11b 802.11a 802.11g
Standard July 1999 July 1999 June 2003
Approved
Maximum 11Mbps 54Mbps 54Mbps
Data rate
Modulation CCK OFDM OFDM and CCK
Data rates CCK= 1,2,5.5,11
6,9,12,18,24,36, Mbps
1,2,5.5,11 Mbps
48,54 Mbps OFDM=6,9,12,18,2
4,36,48,54 Mbps
Frequencies 5.15-5.35 GHz
2.4-2.497 GHz 2.4-2.497 GHz
5.425-5.675 GHz
OFDM (Orthogonal Frequency Division Multiplexing)
CCK (Complementary Code Keying) 49
Basic Computer Network

50. Wi-Fi
Wi-Fi F F Wireless Fidelity ˈ
F F F
IEEE 802.11 (Institute of Electrical and Electronic
Engineer 802.11)
F F F
F F (Wireless Local Area Network
(WLAN)) F F UHF (Ultra High
Frequency)
50
Basic Computer Network

51. Wireless Network Components
.
Access Point …
…
…
…
…
…
. … RF interface for
.…… desktop PC
……
……
…
…
…
…
…
RF interface for
…
notebook
…
…
.…
.
RF interface for
iPAQ / Casiopia)
51
Basic Computer Network

52. Access Point
ˈ F Wireless Network
ˈ
- F F
F F F F F
128
F F MAC
address
F F F
Client mode, Infrastructure, Repeater,
Multipoint repeater
52
Basic Computer Network

53. RF Interface Card
F PCMCIA F F PCI F PCI Wireless F F F PCMCIA
USB port
Card Compact flash F PCMCIA
PCMCIA : Personal Computer Memory Card International Association
53
Basic Computer Network

54. F F
F Wi-Fi F
F F F
F F F IEEE 802.11a/b/g
54
Basic Computer Network

55. F F WLAN
Ad- hoc connection
Wireless Bridging
Infrastructure connection (LAN-to-LAN connectivity)
55
Basic Computer Network

56. Peer to Peer Topology (Ad hoc)
o F F F F Access Point
o F F ( F 3 )
o F F
Ad-
Ad-hoc network is a network typically created in a spontaneous manner.
manner.
56
Basic Computer Network

57. F Infrastructure F Access Point
F F F F F
F
F F
57
Basic Computer Network

58. F Infrastructure F Access Point
F Access point
Access point F F F F F Roaming
ˈ F
58
Basic Computer Network

59. Channels - IEEE802.11 DS
2412 2472
1 2 3 4 5 6 7 8 9 10 11 12 13
2400
5 10
4 9
3 8 13
2 7 12
1 6 11
o 3 F F F /
o Access Points F 3
o F F bandwidth F F 22 MHz.
o F F 11 Mb/s
59
Basic Computer Network

60. Service Set Identifier (SSID)
• F Service Set
• ˈ F F F
• F F F F F
ˈ
60
Basic Computer Network

61. Wired Equivalent Privacy
(WEP)
• F
Ac-Hoc
• ʽ
• F WEP 64 F F 10 digit
• F WEP 128 F F 26 digit
61
Basic Computer Network

62. Local Area Network (LAN)
Wireless LAN (WLAN) as an
extension to wired LAN
Hub
Hub Access Point
Server Switch
Internet
Ethernet Client
62
Basic Computer Network

63. F F F F
1. F ( PC F) F F
F
PCMCIA F PCI F PCI
Slot F
PCI Wireless F F F PCMCIA PCI Slot
F
USB F F USB F( USB
F F F F F F )
63
Basic Computer Network

64. F F F F
2. F F F F F F
PCMCIA F F F F F F Centrino
USB F F USB F F
3. F F F Centrino F ˈ F F F
F F Centrino F F F
F
4. F Palm Pocket PC F F F
F F F Palm Pocket
PC F F F
64
Basic Computer Network

65. DELL
65
Basic Computer Network

66. Hewlett Packard
66
Basic Computer Network

67. IBM
67
Basic Computer Network

68. ACER
68
Basic Computer Network

69. Compaq
69
Basic Computer Network

70. Compaq
70
Basic Computer Network

71. ASUS
71
Basic Computer Network

72. THE END
Q&A
72
Basic Computer Network