This document discusses computer networks and networking components. It covers local area networks (LANs), wide area networks (WANs), networking topologies like bus, star and ring. It also discusses common networking protocols like TCP/IP, hardware components including switches, routers, and cables. Wireless networking standards and concepts are explained as well. Network security components like firewalls are also mentioned. Network administration and troubleshooting tools such as ipconfig, ping and traceroute are listed.

2. Computer Network)

3. LAN (Local Area Network)
MAN (Metropolitan Area Network)
WAN(Wide Area Network)
LAN (Local Area Network)
MAN (Metropolitan Area Network)
WAN (Wide Area Network)
World wide
dial up/
Leased Line/ ISDN)

5. •
•
•
•
•
•

6. Peer to Peer
Client Server• Peer to Peer Network
Peer)
Client Server
Peer to Peer
Workgroup) Windows 98/Me XP
• Client-Server
-
peer to peer client-server
server

7. 1. Ethernet/ Fast Ethernet/ Gigabit Ethernet
2. Wireless LAN
Ethernet / Fast Ethernet / Gigabit Ethernet LAN
LAN
Gbps
UTP Fiber optic
Wireless LAN

8. Wireless
• IEEE 802.11 GHz
Mbps
• IEEE 802.11b GHz
Mbps / 22Mbps
• IEEE 802.11a GHz, 5.47～
5.725GHz Mbps
• IEEE 802.11g GHz
Mbps
• IEEE 802.11n GHz / 5GHz
Mbps

9. • Ad-Hoc)
Access Point

10. •
Access Point)
Access Point

11. Protocol)

12. • Syntax Format) Structure)
address)
syntax
• Semantics
syntax
• Timing
Mbps
Mbps

13. Standard)
International Organization for Standardization (ISO)

14. • physical layer)
• data link layer)
node) 2
• network layer)
• transport layer)
• session layer)
-
-
module)
• presentation layer)

15. •
TCP/IP, FTP, HTTP HTTPs

16. TCP/IP (Transmission Control
Protocol/Internet Protocol)
ARPANET
TCP/IP
•
•
-

17. TCP/IP
Header Header
Encapsulate
Header
Demultiplexing

18. Encapsulation/Demultiplexing
TCP/IP

19. - Host-to-network)
IP
The
Internet Layer)
packet-switching network)
Connectionless)
Packet)

20. Protocol (TCP)
connection-oriented) Byte stream
message
message TCP
UDP (User
Datagram Protocol) connectionless)
client/server
system) request/reply)
voice)
Application Layer)
TELNET
FTP
SMTP

21. FTP (File Transfer Protocal)
FTP
• FTP
USER) User Interface
FTP FTP
PI (Protocol Interpreter module)
DT (Data Transfer

22. HTTP(Hyper Text
Transport Protocol)
•
HTTP
end-user)

23. HTTPs(Hypertext Transfer
Protocol Security )
• HTTP protocol
server client
Netscape
- -

24. Network Topology)

25. Network Topology)

26. point-to-pointConnection)
multipoint Connection)
point-to-point)
multipoint)

27. Bus Topology
backbone coaxial
terminator
-

28. Bus
•
–
– Star
–
•
–
– Terminator
–

29. Ring-Topology
•

30. Star-Topology
HUB)
• Star
•
•
Bus
hub switch

31. •
• Transmission Media)
• Hardware)
•
Software)

33. Router)
•
LAN
WAN

34. Switch
•
• Bandwidth 10/100/1000 Mbps
•

35. Hub
•
• Bandwidth 10/100/1000 Mbps
•

36. Hub
Switch
• Hub Hub
Hub Switch
Switch
Hub
– Hub Repeater)
Switch

37. Ethernet Card
•
Switch Hub
• Bandwidth 10/100/1000 Mbps

38. Ethernet Card
• LNK LINK
• MB/s
MB/s
• ACT (Activity) -

39. Modem
•
• Bandwidth 56 Kbp

40. Access Point
•
wireless)
• Bandwidth 11/54 Mbps

41. Wireless Card
•
• Bandwidth 11/54 Mbps

42. UTP (Unshielded Twist Pair)
•
Ethernet Switch Hub
• Bandwidth 10/100/1000 Mbps
•

43. UTP RJ-45
• UTP Ethernet Lan
RJ-45
• UTP

44. RJ-45
• A (Standard 568A)
•
•
•
•
•
•
•

45. • B (Standard 568B)
•
•
•
•
•
•
•

46. UTP RJ-
45
• UTP Straight Cable)
Hub Switch
A B
• UTP Cross-over Cable)
Hub Switch
Router (

47. UTP Straight Cable)

48. UTP Cross-over Cable

49. STP (Shielded Twisted Pair)
• UTP
UTP
• UTP

50. Fiber Optic
•
• Bandwidth 10/100/1000 Mbps
• m – 2Km

51. Duplex
• Half Duplex
Ethernet BaseT (10Mbps)
• Full Duplex
Fast Ethernet
(100Mbps) Gigabit Ethernet (1000Mbps)

54. •
•
digital
•
•
•

55. •
•
•

56. WIRELESS LAN)
•
• Wireless LAN WLAN)

57. •
• Mobility)
•
•
•

58. • PC
Notebook Pocket PC
PCMCIA
•
Cisco, Orinoco, Toshiba, 3Com, Linksys
• Access Point) :
LAN

59. • Ad-Hoc)
Access point)
• Infrastructure)
Access
point)

60. • WPAN (Wireless Personal Area Network)
IR (Infra-Red) Bluetooth
• WLAN (Wireless Local Area Network)

61. • FireWall)
•
• User
Name and Password)

63. • ipconfig ->
• Ping ->
• Nslookup ->
• Traceroute ->

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