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1Basic Computer Network
2Basic Computer Network
�LAN OverviewLANs 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
3Basic Computer Network
Outsideresources
Firewall Gateway
DMZ
Data network
LAN WAN
ServerServer
PrinterPrinter
Hub/Switch
Media
PC Workstation/ClientsPC Workstation/Clients
LAN
4Basic Computer Network
Thicknet
Thinnet
LAN Media
Fiber Optic
5Basic Computer Network
LAN Media
RJ-45�STP : Shielded Twisted Pair
�UTP : Unshielded Twisted Pair
6Basic Computer Network
BNC connector
LAN Adaptor
RJ-45 connector
�NIC : Network Interface Card
�PCI : Peripheral Component Interconnect Cards
7Basic Computer Network
�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)
8Basic Computer Network
Hub
Switch
LAN Connecting Devices
9Basic Computer Network
HUB• HUBs: ������ ��������� ������������ �����������������
!"#�� "��$%�!&��&'� ( � �!)#���&'�!*�����+������
• �,' ���!�-� 2 ��!.�"#� ��������� 1 "Passive HUBs� "#������� �� ����� ����,����' /'��*���0� ��������� 2 �Active HUBs� "#������� �� ����� �������������12��!�#��!�%+���+���*� �����,�����' /'��*���0�
3 HUBs ��� ����0',��+�,)�2�� � 1 *� �,,����� OSI Model
10Basic Computer Network
Switch• Switches: �������� �!)'�!+ ����, HUBs "#��������*���0� ��������
�����*���0����� !"#�� "��$%�!&�� �#������"��$%�!&��� ���0'�,,!"#�*'��
• "�������6� ����!��#� Hubs "#� �����,)'� �����*� *���0�� �� �.�$"���"�,"�� *� ��������� )'� �� �#�� ( � ��%��"���"�,"�� ������'�
3 Switches � ����� ������ ����0',��+�,)�2�� � 2 *� �,,����� OSI Model (�)�!)#��� LANs � �� Topology � �!��#�����)
11Basic Computer Network
Router• Router: �����!"#�*'��"��$%�!&��� ��������� �����!)#���J� !"#�*'��
"��$%�!&����!.� LANs – WANs �#� WANs – WANs ����� ������ ��*� ����� Router "#� ��$%���"�+!�#��!����� �����' /'��*���0����� !"#�*'��"��$%�!&���#�� ( (Internetworking Device)
• ���' /'��*���0�*� Router ���)�J�J&"�� IP J+���� ����0',��+�,)�2�� � 3 *� �,,����� OSI Model
TOT’s NETWORK
12Basic Computer Network
LAN Topologies
BUS
STAR RING
• Bus• Ring• Star• Star-Bus
13Basic Computer Network
�Star-Bus Topology
14Basic Computer Network
+,-./0123456 Gigabit Ethernet
system 96::690;6<
IEEE 802.3ae
+,-./0123456 Gigabit Ethernet system 96::690;6<
IEEE 802.3z/802.3ab
+,-./0123456 Fast Ethernet system 96::690;6<
IEEE 802.3u
C6.D1EF/0123456 ......... 96:
:690;6< IEEE 802.3
GH906I46:/0J4 10 Gbps
GH906I46:/0J4 1000 Mbps
GH906I46:/0J4 100 Mbps
GH906I46:/0J4 10 Mbps
/DIL<LM21I46:/0J4 ETHERNET
&'�'( )'&�*'+ IEEE802.3
15Basic Computer Network
Fast EthernetTwisted Pair
(UTP)......... /:90100 Mbps100baseT
Fiber Optic2000 /:9010 Mbps10baseF
Twisted Pair (UTP)
STAR100 /:9010 Mbps10baseT
Thick EthernetThick Coaxial500 /:9010 Mbps10base5
Thin Ethernet S0TG
CheapernetThin CoaxialBUS185 - 200 /:9010 Mbps10base2
UT-G/0123V62D1-WUX Cable
Topology D1-WUX
0F2FI46:264 W<3600HC-V5.
YXG:ZM
GH906I46:/0J4 3600HC-V5.
YXG:ZM
:690;6< 360
/UT-G:95G
:690;6<360/UT-G:95G ETHERNET
16Basic Computer Network
IP Address3 Internet Protocol Address !�-�����!�*��� �% �����&'� ( � �!)#���&'�
��J" *'�� � ���'12����� �����'/0�&%+��, Hardware ����,+���
– "'�*� ����!�*�������!"#�*'�� (Host Address)
– "'�*� ����!�*!"#�*'�� (Network Address)
• � *��+ 32 bit �,' !�-� 4 �'�� �&'���'�� � "'�&�2 �&' 0- 255
17Basic Computer Network
18Basic Computer Network
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
19Basic Computer Network
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 range172.16.x.x – 172.31.x.x
20Basic Computer Network
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 range192.168.x.x
21Basic Computer Network
22Basic Computer Network
Dynamic Host Configuration ProtocolDynamic Host Configuration Protocol
• DHCP "#� Service � ��������� �������� IP Address *� �,,!"#�*'�� �����,!"#�� �0�*'�� (Client) ��&J���&% ������/0�+0���,,��'&�� "����,&�2 "'�&'� ( ����!)#���&'�� �!"#�� Client � ��!"#�� �����)� ���,,+� ��'�� !"#�� ���,%�� (Server) ��&�� &%+&�2 Service ��,�&' ���!������ ��� run ��� �'��� �!"#�� Client ��&�� ��,�&' ����,�,, IP ���!"#�� ���,%��
23Basic Computer Network
Domain Name� )#��J+!�� (Domain Name) ����6] )#��� �60�! �������! ��!�-�
����!�*�%�!���!�̂& (IP Address) �����!�-�)#��� ��#��"�������6] ��'�� �� �#�!���*� !�^,�1&���2�(
� !)'�!�^,�1&�*� !�"!�" � ����!�* IP "#� 202.44.204.33 � �������+ ")#��J+!��" !�-� www.nectec.or.th
� ��&%+&'����'� "��$%�!&����!"#�*'�� �)� IP Address !"#�� � ��������� �!�-�&�� Lookup �#�+�)� ����!�b++0,��) ����!�*���)#��� �!�-�&�����c (Domain Name) ! ���'� Domain Name Server
24Basic Computer Network
1'�12'3+456'57)89:�&7�;<+1'��=>�7)&67 Network
Windows 98 / ME
25Basic Computer Network
1'� setup windows 98/ME
Click Y46D1- My computer /MTG3 Properties
Network Interface Card
904EVGC3609[\9H]. Network Interface Card
26Basic Computer Network
1'� setup windows 98/ME
• start
• Setting
• Control Panel
27Basic Computer Network
1'� setup windows 98• !�b+ Control Panel !�#�� Network
28Basic Computer Network
Network Configuration
1
2
29Basic Computer Network
TCP/IP Properties : IP Address
30Basic Computer Network
DNS Configuration
31Basic Computer Network
• &����,��!)#���&'����'� PC ��, Network J+���!*����� � DOS Prompt ���� $%�$� ipconfig /all
32Basic Computer Network
3�>7?���� RUN 89)8; winipcfg
33Basic Computer Network
1'�12'3+456'57)89:�&7�;<+1'��=>�7)&67 Network
Windows XP / 2000
34Basic Computer Network
1. 5@91A:'&�( Icon My network Place F@G:5@91��� Properties1'� Setup Windows XP / 2000
35Basic Computer Network
2. 5@91A:'&�( Local Area connection F@G:5@91��� Properties
36Basic Computer Network
3. Double Click &�( Internet Protocol (TCP/IP)
37Basic Computer Network
4. �@>71 Obtain an IP automatically, Obtain DNS server automatically
38Basic Computer Network
1'� Setup V6'+ Control Panel
����� Control Panel
39Basic Computer Network
Double Click ��� Network Connections
Double Click Network
Connections
40Basic Computer Network
"�%�*��� � Local Area Connection ���!�#�� Properties
Click ���
����� Properties
41Basic Computer Network
�@>71 Internet Protocol (TCP/IP) F@�5@91����WX) Properties F@G:<+FYZ General <3G�@>71 Obtain an IP address automatically F@� Obtain DNSserver address automatically.
�@>71 internet Protocol(TCP/IP)
�@>71 obtain an IP address
�@>71 obtain DNS
Click Properties
42Basic Computer Network
• &����,��!)#���&'����'� PC ��, Network J+���!*����� � DOS Prompt ���� $%�$� ipconfig /all
43Basic Computer Network
52'\]�(&�:^\7Z�5�>7A6'_ Ping52'\]�(&�:^\7Z�5�>7A6'_ Ping• �)�����&����,�6�����!)#���&'����'� !"#�� &���� ��,!"#�� ������
J+����' �$^"!�^�*���0�*��+!�̂� ( ��/'���� J�J&"�� ICMP (Internet Control Message Protocol) ���!"#�� ������ � �!��' �$"̂!�^�����2���� ����0' �^��&�,���,��!�-� ICMP Echo Reply (&���' !�-� ICMP Echo Request)
• ,� � � �!"#�� ������ � �� block ping !�����+��� Fire wall !�#�� �����!�&�+���"������+.�� ������/�� ��+�����!�-��'�&%+&'�!"#�� ������ ��'�+�
44Basic Computer Network
��̀4 command prompt 89)8;52'\]�( Ping &')4G:_�@A IP address 7W�1�a;�@'_�'(���&94&67
45Basic Computer Network
Wireless LANWireless LAN
46Basic Computer Network
������� Wireless LAN (Local Area Network) ���� WLAN � !"�������#�$�#���%�&'(�)�&��*)#'��+,-./%��01$"2.. peer-to-peer /5$�&6�% 27�(+#0�"5 (station) #�&��0#�$�#��09�:-";,%�,7��2..;�%#� <9$��' 2..���:��#�$�#��� !";,%/-=�2..>?,7��>?, (point-to-point) ����2..>?,7���(�>?, (point-to-multi point)
������� WLAN � !"B((-CDE���:��"F�������� LAN &� �-. �?� �,� (5$"#�$�/5$/F��"%�/5$� !"7-):(���-.#�� <9$��,1&������� LAN &5:��6G%#����.1(2..7��� H
<[26:YG.LI0.Y562 Wireless LAN
47Basic Computer Network
I_`a0FL2U<bYG.0FCCVT-GV60c0XV62
� ;&�&5�%�>F�:-,6"���$��7F�2�"��/5$#�&��06G%.�1:��71,7��#�$�#��
� 6"�I+:F�(-�71,7��#�$�#�� B'%6G%.�1:��#�&��0��(�$�"/5$;,%
� �������71,7��#�$�#��#�&��0#�%���9="6G%��";,%��� �),��*) 2(+7%"/?"0'::)���������/5$6G%#�
48Basic Computer Network
4[4Hd<6360YG.LI0.Y562YXG:ZMc0XV62
Wireless LAN (Proprietary)
Wired LAN Network
IEEE Standard ETSI Standard
IEEE 802.11
IEEE: Institute of Electrical and Electronics EngineersETSI: European Telecommunications Standards Institute
HiperLAN/1HiperLAN/2HiperACCESS
IEEE 802.11b (Wi-Fi) IEEE 802.11a (Wi-Fi5)
IEEE 802.11g (Wi-Fi)
49Basic Computer Network
IEEE 802.11Specifications
2.4-2.497 GHz5.15-5.35 GHz
5.425-5.675 GHz2.4-2.497 GHz
Frequencies
CCK= 1,2,5.5,11 Mbps
OFDM=6,9,12,18,24,36,48,54 Mbps
6,9,12,18,24,36,48,54 Mbps
1,2,5.5,11 Mbps
Data rates
OFDM and CCKOFDMCCKModulation
54Mbps54Mbps11MbpsMaximum Data rate
June 2003July 1999July 1999Standard Approved
802.11g802.11a802.11b
�OFDM (Orthogonal Frequency Division Multiplexing)
�CCK (Complementary Code Keying)
50Basic Computer Network
Wi-Fi� Wi-Fi 25G:6E63Ig6456 Wireless Fidelity /ah</I0T-G.S:62D6.360IX6YG.U_\:690;6</I0TGY562c0XV62 IEEE 802.11 (Institute of Electrical and Electronic Engineer 802.11)
� :690;6<<1]3g6S<\/DIL<LM21D1-WUXV0X6./I0TGY562IG:i[4/9G0bc0XV62 (Wireless Local Area Network (WLAN)) L\2WUXIMT-<4[D2_256<I46:j1- UHF (Ultra High Frequency)
51Basic Computer Network
Wireless Network Components
RF interface for iPAQ / Casiopia)
Access Point
………….……. ………………….
……
……
……
……
.….
RF interface for desktop PC
RF interface for notebook
52Basic Computer Network
Access Point� /ah<E_\kZ<2b3M6.Vg6S0HC Wireless Network
� V6:60jjG\/aM1-2</ah</V6G636k /iT-G/i[-:0F2F
0HC - V5.c\X
� V6:60j/YX60SHVYXG:ZMD1-0HC/YX6lMFV5.GG3\X42
0SHV lCC 128 C[9
� Eg63H\360/UT-G:95G\X42360M.DF/C12< MAC
address
� V6:60ja0HCLS:\360Dg6.6<c\XSM62lCC c\Xl35
Client mode, Infrastructure, Repeater, lMF
Multipoint repeater
53Basic Computer Network
RF Interface Card
lM<c0XV62lCC PCMCIA USB portCard Compact flash
360b\ PCMCIA 9[\9H]./YX63HC360b\ PCI 360b\ PCI Wireless c:59XG.:1360b\ PCMCIA
�PCMCIA : Personal Computer Memory Card Internationa l Association
54Basic Computer Network
������������ �
���������� Wi-Fi � ������������������������������������
������������� ���� ���������������!�����"�� IEEE 802.11a/b/g
55Basic Computer Network
Wireless Bridging (LAN-to-LAN connectivity)Infrastructure connection
Ad- hoc connection
&'()*+,-./0-1-234(210'5 WLAN
56Basic Computer Network
Peer to Peer Topology (Ad Peer to Peer Topology (Ad Peer to Peer Topology (Ad Peer to Peer Topology (Ad hochochochoc))))o ��������������� �������������� �� ���������������� Access Point
o ��������������� �������������������� (������� 3 ��)
o ��� ��������� ��� ������� !���" #��$�����%��&����� ���� �� '
AdAdAdAd----hoc network is a network typically created in a spontaneous mannhoc network is a network typically created in a spontaneous mannhoc network is a network typically created in a spontaneous mannhoc network is a network typically created in a spontaneous manner.er.er.er.
57Basic Computer Network
360/UT-G:95GlCC Infrastructure WUX Access Point 9H4/\124
l95MF/I0T-G. V6:60j/IMT-G<2X62c\XG256.G[V0F m62W<YGCY562360/UT-G:95G
c:5Eg63H\Eg6<4<E_\/UT-G:95G
58Basic Computer Network
1'��=>�7)&67FZZ Infrastructure <=G Access Point 3@'_&]:
8>c+���5�7Z5@W)�]c(3)4��d+�5�>7A6'_�4�_:1]+
�5�>�7(@e1A6'_\')'�Y�5@>�7+��� ^'18>c+���A7( Access point &]:3+f�( ?�_](8>c+���A7( Access point 7�1&]:3+f�(?4G g4_1'��=>�7)&67?)6A'4=6:( ���_1:6' Roaming
59Basic Computer Network
&'()8+-& Channels - IEEE802.11 DS
o .> 3 *0-2@>,*0-2ABCC'D48+,EF.0)&5/@BH&BEo A'.'(I.> Access Points FJK 3 /BLMEN+OE@>,)J>5L&BEo P/08Q*0-24L'.I>,.> bandwidth @>,M*K2'E)@0'&BH 22 MHz.o 4L'.)(VL1-21K-.W8)@0'&BH 11 Mb/s
1 2 3 4 5 6 7 8 9 10 112400
2472241212 13
1
2
3
5
4
6
7
8
10
9
13
11
12
60Basic Computer Network
Service Set Identifier (SSID)
• )#����� �% Service Set• !�-�&���,' ������'� !"#�*'��
• 6��&�� ��!)#���J� !*��!"#�*'��&�� �����+!�-�)#��!+ �����
61Basic Computer Network
Wired Equivalent Privacy (WEP)
• !�#��!�#��&�� ����c�"������+.���,, Ac-Hoc
• &����,�%�e%�,,�,,�b+
• 6��!�#�� WEP 64 ,%&��'" �� 10 digit
• 6��!�#�� WEP 128 ,%&��'" �� 26 digit
62Basic Computer Network
Local Area Network (LAN)
HubHubHubHub
ServerServerServerServer SwitchSwitchSwitchSwitch
InternetInternetInternetInternet
Access PointAccess PointAccess PointAccess PointHubHubHubHub
Wireless LAN (WLAN) as an Wireless LAN (WLAN) as an Wireless LAN (WLAN) as an Wireless LAN (WLAN) as an extension to wired LANextension to wired LANextension to wired LANextension to wired LAN
Ethernet ClientEthernet ClientEthernet ClientEthernet Client
63Basic Computer Network
1. ����$����&C1)�7��E�,#/*� (����$�� PC 7-=��7\+) /F�:���G�$�&7��:-.:��E,
2(";�%#�
� 2.. PCMCIA :-.:��E, PCI "F�&��G�$�&7��:-" 2(+71,7-=�." PCI
Slot �������$����&C1)�7��E
� 2.. PCI Wireless /5$;&�7%��&5:��E, PCMCIA 2(+71,7-=�." PCI Slot
�������$����&C1)�7��E
� 2.. USB B��"C��E7 USB �������$����&C1)�7��E (2.. USB >+
#+,)::)��2(+#�&��06G%��":-.����$���"%7.?\�;,%�G�":-")
�V0_a/CT]G.9X<W<360WUX.6</I0TGY562c0XV62
64Basic Computer Network
2. ����$����&C1)�7��E�"%7.?\� /F�:���G�$�&7��:-.:��E,2(";�%#�
� 2.. PCMCIA ��&�+#F���-.����$���"%7.?\��?�"�:��/5$;&�6G� Centrino� 2.. USB B��"C��E7 USB �������$���"%7.?\�
3. ����$����&C1)�7��E�"%7.?\�2.. Centrino ;&�>F�� !"7%��<�=��? :�IE2(";�%
#��C1$& �C��+����$���"%7.?\�2.. Centrino #�&��06G%��"��������;�%#�
;,%�,7��
4. �? :�IEC:C� Palm ���� Pocket PC /F�:���G�$�&7��:-.�? :�IE2(";�%
#�2..:��E,;)�(# <9$�:��E,;)�(#"5=#F���-.�G�$�&7��:-. Palm ���� Pocket
PC 27�(+�?�"�/��"-="
�V0_a/CT]G.9X<W<360WUX.6</I0TGY562c0XV62
65Basic Computer Network
DELL
66Basic Computer Network
Hewlett Packard
67Basic Computer Network
IBM
68Basic Computer Network
ACER
69Basic Computer Network
Compaq
70Basic Computer Network
Compaq
71Basic Computer Network
ASUS
72Basic Computer Network
THE ENDTHE END
Q & AQ & A
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