LAN

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???????????????????????? ?????????
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• 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

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LAN
LAN
WAN
DMZ
Firewall
Gateway
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LAN Media
Thinnet
Thicknet
Fiber Optic
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LAN Media

• STP Shielded Twisted Pair
• UTP Unshielded Twisted Pair

RJ-45
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LAN Adaptor
RJ-45 connector
BNC connector

• NIC Network Interface Card
• PCI Peripheral Component Interconnect Cards

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• 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/ma
  c_find/
• Specific MAC address that means broadcast
• ff-ff-ff-ff-ff-ff (All 1s)

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LAN Connecting Devices
Hub Switch
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HUB

• HUBs ?????????????????????????????????
  ?????????????????????????????????????????? ?
  ??????????????????????????
• ??????????? 2 ????????? ????????? 1 "Passive
  HUBs ???????????????????????????????????????????
  ????????? 2 Active HUBs ????????????????????????
  ??????????????????????????????????????????????????
  ?????????
• HUBs ??????????????????????? 1 ??????????? OSI
  Model

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Switch

• Switches ????????????????????? HUBs
  ?????????????????? ???????????????????????????????
  ????????????? ????????????????????????????????????
  ??????
• ????????????????????? Hubs ??? ???????????????????
  ??????????????????????????????????????????????????
  ?? ? ????????????????????????????
• Switches ??????????????????????????????????? 2
  ??????????? OSI Model (????????? LANs ?????
  Topology ????????????)

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Router

• Router ??????????????????????????????????????????
  ????????????????????????????????????? LANs WANs
  ???? WANs WANs ????????????????????????? Router
  ??? ??????????????????????????????????????????????
  ?????????????????????????? ? (Internetworking
  Device)
• ??????????????????? Router ????????????? IP
  ?????????????????????????? 3 ??????????? OSI Model

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LAN Topologies

• Bus
• Ring
• Star
• Star-Bus

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• Star-Bus Topology

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????????????????? ETHERNET ????????????????? ETHERNET ????????????????? ETHERNET ????????????????? ETHERNET
????????????? 10 Mbps ????????????? 100 Mbps ????????????? 1000 Mbps ????????????? 10 Gbps
??????????????? ......... ?????????? IEEE 802.3 ???????????? Fast Ethernet system ?????????? IEEE 802.3u ???????????? Gigabit Ethernet system ?????????? IEEE 802.3z/802.3ab ???????????? Gigabit Ethernet system ?????????? IEEE 802.3ae
????? ??????? IEEE802.3
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??????????????????? ETHERNET ??????????????????? ETHERNET ??????????????????? ETHERNET ??????????????????? ETHERNET ??????????????????? ETHERNET ??????????????????? ETHERNET
??????? ???????????? ????????????? ??????-??? ?????? ??????????? ????????-??? ?????? Topology ?????? ????????? Cable ?????????
10base2 10 Mbps 185 - 200 ???? BUS Thin Coaxial Thin Ethernet ???? Cheapernet
10base5 10 Mbps 500 ???? Thick Coaxial Thick Ethernet
10baseT 10 Mbps 100 ???? STAR Twisted Pair (UTP)
10baseF 10 Mbps 2000 ???? Fiber Optic
100baseT 100 Mbps ......... ???? Twisted Pair (UTP) Fast Ethernet
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IP Address

• Internet Protocol Address ????????????????????????
  ?????? ?????????????????????? ????????????
  ??????????????? Hardware ??????????
• ??????????????????????????????? (Host Address)
• ?????????????????????? (Network Address)
• ?????? 32 bit ???????? 4 ???? ?????????
  ???????????? 0- 255

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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

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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
• 2 14 16,384 class B addresses
• All allocated
• Private address range
• 172.16.x.x 172.31.x.x

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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
• 2 21 2,097,152 class C addresses
• Near all allocated
• Private address range
• 192.168.x.x

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Dynamic Host Configuration Protocol

• DHCP ??? Service ???????????????????? IP Address
  ???????????????? ???????????????????? (Client)
  ????????? ????????????????????????????????????????
  ?? ???????????????????????? Client ???????????
  ??????????????????????? ???????????????? (Server)
  ????????????? Service ?????????????????? ??? run
  ??? ?????????????? Client ????????????????????????
  IP ???????????????????

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Domain Name

• ????????? (Domain Name) ???????
  ?????????????????????????????????????????????????
  (IP Address) ?????????????????????????????????????
  ?? ????????????????????????
• ????????????????????? ????????? IP ???
  202.44.204.33 ?????????? "?????????" ????
  www.nectec.or.th
• ?????????????????????????????????????? ??? IP
  Address ?????????????????????????? Lookup
  ????????? ???????????????????????
  ?????????????????????? (Domain Name) ????????
  Domain Name Server

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???????????????????????????????????? Network

• Windows 98 / ME

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??? setup windows 98/ME
Click ?????? My computer ????? Properties
Network Interface Card
????????????????? Network Interface Card
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??? setup windows 98/ME

• start
• Setting
• Control Panel

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??? setup windows 98

• ???? Control Panel ????? Network

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Network Configuration
1
2
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TCP/IP Properties IP Address
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DNS Configuration
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• ?????????????????????????? PC ??? Network
  ??????????????? DOS Prompt ???? ????? ipconfig
  /all

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????????? RUN ????? winipcfg
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???????????????????????????????????? Network

• Windows XP / 2000

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??? Setup Windows XP / 2000
1. ?????????? Icon My network Place ???????????
Properties
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2. ?????????? Local Area connection ???????????
Properties
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3. Double Click ??? Internet Protocol (TCP/IP)
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4. ????? Obtain an IP automatically, Obtain DNS
server automatically
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??? Setup ???? Control Panel
????? Control Panel
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Double Click ??? Network Connections
Double Click Network Connections
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?????????? Local Area Connection ????????
Properties
Click ???
????? Properties
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????? Internet Protocol (TCP/IP) ??????????????
Properties ????????? General ???????? Obtain an
IP address automatically ??? Obtain DNS server
address automatically.
????? obtain an IP address
????? internet Protocol(TCP/IP)
????? obtain DNS
Click Properties
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• ?????????????????????????? PC ??? Network
  ??????????????? DOS Prompt ???? ????? ipconfig
  /all

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?????????????????????? Ping

• ??????????????????????????????????????????????????
  ??????????????????? ??????????????????????????????
  ? ? ????????????????? ICMP (Internet Control
  Message Protocol) ????????????????????????????????
  ????????????????? ????????????????? ICMP Echo
  Reply (?????????? ICMP Echo Request)
• ????????????????????????????? block ping
  ?????????? Fire wall ?????????????????????????????
  ? ????????????????????????????????????????????????
  ?? 

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???? command prompt ??????????? Ping ??????????
IP address ???????????????????????
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Wireless LAN
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???????????????? Wireless LAN
???????? Wireless LAN (Local Area Network) ????
WLAN ?????????????????????????????????????????????
??????? peer-to-peer ????????? ??????????
(station) ?????????????????????????????????????
??????????????????????????????????????????????
(point-to-point) ????????????????????
(point-to-multi point) ???????? WLAN
??????????????????????????? LAN ??????????
???????????????????????????????????????????
???????????????? LAN ???????????????????????? ?
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???????????????????????????????

• ???????????????????????????????????????????????
  ????????????
• ??????????????????????? ???????????????????????
  ????????
• ???????????????????????????????????????????????
  ?? ??????? ?????????????????????????????????

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?????????????????????????????????
Wired LAN Network
Wireless LAN (Proprietary)
IEEE Standard
ETSI Standard
IEEE 802.11
HiperLAN/1 HiperLAN/2 HiperACCESS
IEEE 802.11b (Wi-Fi)
IEEE 802.11a (Wi-Fi5)
IEEE 802.11g (Wi-Fi)
IEEE Institute of Electrical and Electronics
Engineers ETSI European Telecommunications
Standards Institute
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IEEE 802.11Specifications
802.11b 802.11a 802.11g
Standard Approved July 1999 July 1999 June 2003
Maximum Data rate 11Mbps 54Mbps 54Mbps
Modulation CCK OFDM OFDM and CCK
Data rates 1,2,5.5,11 Mbps 6,9,12,18,24,36,48,54 Mbps CCK 1,2,5.5,11 Mbps OFDM6,9,12,18,24,36,48,54 Mbps
Frequencies 2.4-2.497 GHz 5.15-5.35 GHz 5.425-5.675 GHz 2.4-2.497 GHz

• OFDM (Orthogonal Frequency Division Multiplexing)
  
• CCK (Complementary Code Keying)

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Wi-Fi

• Wi-Fi ????????????? Wireless Fidelity
  ??????????????????????????????????????????????????
  ?? IEEE 802.11 (Institute of Electrical and
  Electronic Engineer 802.11)
• ?????????????????????????????????????????????????
  ???????????? (Wireless Local Area Network (WLAN))
  ??????????????????????????? UHF (Ultra High
  Frequency)

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

• ?????????????????????? Wireless Network
• ???????????????????????????? ??????????????
• ??? - ??????
• ???????????????????????????????????????????
• ???? ??? 128 ???
• ????????????????????????????????? MAC
• address
• ???????????????????????????????? ??????
  
• Client mode, Infrastructure, Repeater, ???
• Multipoint repeater

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RF Interface Card
????? PCI Wireless ?????????????? PCMCIA
????? PCMCIA ??????????????????? PCI
USB port
Card Compact flash
???????????? PCMCIA

• PCMCIA Personal Computer Memory Card
  International Association

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??????????????????
????????????  Wi-Fi ??????????????????????????????
?????????

??????????????????????????????????????????????
IEEE 802.11a/b/g
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??????????????????????? WLAN
Ad- hoc connection
Wireless Bridging (LAN-to-LAN
connectivity)
Infrastructure connection
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Peer to Peer Topology (Ad hoc)

• ??????????????????????????????????
  ??????????????????? Access Point

• ???????????????????????????????????? (??????? 3
  ???)

• ????????????????? ???????????????????????????????
  ?????????? ?

Ad-hoc network is a network typically created in
a spontaneous manner.
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??????????????? Infrastructure ??? Access Point
????????
???????????? ??????????????????????????????
????????????????????????
?????????????????????????
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??????????????? Infrastructure ??? Access Point
???????
?????????????????????????????? ?????????????
Access point ???????? ??????????????? Access
point ?????????????? ?????????????????????????
???????? Roaming
???????????????????????????????????????????
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???????? Channels - IEEE802.11 DS
2472
2412
6
12
13
3
5
7
9
10
11
1
2
4
8
2400
5
10
4
9
3
8
13
2
7
12
1
6
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• ?? 3 ????????????????????????????/??????
• ???????? Access Points ??? 3 ????????????????????
• ?????????????????? bandwidth ???????????????? 22
  MHz.
• ???????????????????????? 11 Mb/s

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Service Set Identifier (SSID)

• ??????????? Service Set
• ??????????????????????????????
• ??????????????????????????????????????????????????
  ???????

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Wired Equivalent Privacy (WEP)

• ???????????????????????????????????? Ac-Hoc
• ??????????????????????
• ???????? WEP 64 ?????????? 10 digit
• ???????? WEP 128 ?????????? 26 digit

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Local Area Network (LAN)
Wireless LAN (WLAN) as an extension to wired LAN
Hub
Access Point
Hub
Server
Switch
Internet
Ethernet Client
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• ???????????????????????????????????????

• ????????????????????????? (??????? PC ????????)
  ???????????????????????????????
• ??? PCMCIA ???????? PCI ????????????????
  ???????????? PCI Slot ?????????????????????
• ??? PCI Wireless ????????????????? PCMCIA
  ???????????? PCI Slot ?????????????????????
• ??? USB ????????? USB ????????????????????? (???
  USB ??????????????????????????????????????????????
  ????????)   

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• ???????????????????????????????????????

• ?????????????????????????? ???????????????????????
  ????????
• ??? PCMCIA ???????????????????????????????????????
  ???? Centrino
• ??? USB ????????? USB ??????????????????
• 3. ????????????????????????????? Centrino
  ??????????????????????????????????????
  ??????????????????????? Centrino
  ????????????????????????????????????
•  4. ??????????? Palm ???? Pocket PC
  ??????????????????????????????????????????????
  ??????????????????????????????????? Palm ????
  Pocket PC ?????????????????

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DELL LATITUDE D500
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Hewlett Packard
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IBM
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ACER Travel Mate 290
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ACER Travel Mate 290
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Compaq EVO N1000v
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Compaq nx9010
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ASUS
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THE END

• Q A