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Internet and LAN Technology
CHAPTER 5
Chapter 5: Internet and LAN Technology 2
5 Chapter Contents
 Section A: Network Building Blocks
 Section B: Local Area N...
Chapter 5: Internet and LAN Technology 3
5 SECTION A
Section A: Network Building Blocks
 Network Advantages and Challenge...
Chapter 5: Internet and LAN Technology 4
5 SECTION A
Section A: Network Building Blocks
 Network Links
 Analog and Digit...
Chapter 5: Internet and LAN Technology 5
5 Network Advantages and Challenges
 Sharing networked hardware can reduce costs...
Chapter 5: Internet and LAN Technology 6
5 Network Advantages and Challenges
 Networks may be vulnerable to unauthorized
...
Chapter 5: Internet and LAN Technology 7
5 Network Classifications
Chapter 5: Internet and LAN Technology 8
5 Geographical Scope: PANs, NANs,
LANs, MANs, and WANs
 Personal Area Network (P...
Chapter 5: Internet and LAN Technology 9
5 Organizational Structure: Client/Server
and Peer-to-Peer
Chapter 5: Internet and LAN Technology 10
5 Physical Topology
 Arrangement of devices in a network
 Each connection poin...
Chapter 5: Internet and LAN Technology 11
5 Physical Topology
Chapter 5: Internet and LAN Technology 12
5 Physical Topology
Chapter 5: Internet and LAN Technology 13
5 Network Links
 Wired network
– Twisted-pair cable
– Coaxial cable
– Fiber-opt...
Chapter 5: Internet and LAN Technology 14
5 Analog and Digital Signals
Chapter 5: Internet and LAN Technology 15
5 Bandwidth
 The transmission capacity of a
communications channel
– High-bandw...
Chapter 5: Internet and LAN Technology 16
5 Communications Protocols
 Rules for efficiently transmitting data from
one ne...
Chapter 5: Internet and LAN Technology 17
5 Communications Protocols
 A packet is a “parcel” of data that is sent
across ...
Chapter 5: Internet and LAN Technology 18
5 SECTION B
Section B: Local Area Networks
 LAN Standards
 Ethernet
 Wi-Fi
 ...
Chapter 5: Internet and LAN Technology 19
5 LAN Standards
 LAN Technologies are standardized by the
IEEE
– ARCnet
– Token...
Chapter 5: Internet and LAN Technology 20
5 Ethernet
 Simultaneously broadcasts data packets to
all network devices
– IEE...
Chapter 5: Internet and LAN Technology 21
5 Ethernet
On an Ethernet, data
travels on a “first come, first
served” basis. I...
Chapter 5: Internet and LAN Technology 22
5 Ethernet
 Varies in speed from 10 Mbps to 10 Gbps
 An Ethernet card is desig...
Chapter 5: Internet and LAN Technology 23
5 Wi-Fi
 Wireless networking technologies that are
compatible with Ethernet
Chapter 5: Internet and LAN Technology 24
5 Wi-Fi
 WEP (Wired Equivalent Privacy) encrypts
data traveling over wireless n...
Chapter 5: Internet and LAN Technology 25
5 HomePNA and HomePLC Networks
 HomePNA networks utilize existing telephone
wir...
Chapter 5: Internet and LAN Technology 26
5 Installing a LAN
CLICK TO START
Chapter 5: Internet and LAN Technology 27
5 Using a LAN
In this drive mapping
example, a server’s drive
C is mapped as dri...
Chapter 5: Internet and LAN Technology 28
5 Using a LAN
 You can allow other
network users to view
and edit files in the
...
Chapter 5: Internet and LAN Technology 29
5 Using a LAN
 The Network Connection tool helps you
troubleshoot connection pr...
Chapter 5: Internet and LAN Technology 30
5 SECTION C
Section C: Internet Technology
 Background
 Internet Structure
 I...
Chapter 5: Internet and LAN Technology 31
5 Background
 The Advanced
Research Projects
Agency designed
ARPANET
 The Inte...
Chapter 5: Internet and LAN Technology 32
5 Internet Structure
Chapter 5: Internet and LAN Technology 33
5 Internet Structure
 Ping is used to find out whether a site is up
and running...
Chapter 5: Internet and LAN Technology 34
5 ISP Infrastructure
Chapter 5: Internet and LAN Technology 35
5 Internet Protocols
 TCP and IP serve as the primary protocols
responsible for...
Chapter 5: Internet and LAN Technology 36
5 IP Addresses
 IP addresses are addresses that identify
computers on the Inter...
Chapter 5: Internet and LAN Technology 37
5 Domain Names
 Easy-to-remember names for Internet
servers
– Ends with an exte...
Chapter 5: Internet and LAN Technology 38
5 Domain Names
Chapter 5: Internet and LAN Technology 39
5 Domain Names
The first step in registering
a domain name is to find out
whethe...
Chapter 5: Internet and LAN Technology 40
5 SECTION D
Section D: Internet Access
 Dial-up Connections
 Cable Internet Se...
Chapter 5: Internet and LAN Technology 41
5 Dial-up Connections
 Uses POTS to transport data between your
computer and yo...
Chapter 5: Internet and LAN Technology 42
5 Dial-up Connections
 Modems are still
required, despite digital
telephone tec...
Chapter 5: Internet and LAN Technology 43
5 Cable Internet Service
Chapter 5: Internet and LAN Technology 44
5 Cable Internet Service
 Cable modems convert your computer’s
signal into one ...
Chapter 5: Internet and LAN Technology 45
5 DSL, ISDN, and Dedicated Lines
 DSL is a high-speed, digital, always-on
Inter...
Chapter 5: Internet and LAN Technology 46
5 DSL, ISDN, and Dedicated Lines
 ISDN connections are slower than DSL and
cabl...
Chapter 5: Internet and LAN Technology 47
5 Wireless Internet Service
 Direct satellite service (DSS)
Chapter 5: Internet and LAN Technology 48
5 Wireless Internet Service
 Fixed wireless Internet service broadcasts
RF sign...
Chapter 5: Internet and LAN Technology 49
5 LAN Internet Access
 Cost-effective way to share one Internet
connection amon...
Chapter 5: Internet and LAN Technology 50
5 Mobile Internet Access
 A Wi-Fi hotspot is a wireless broadband
Internet serv...
Chapter 5: Internet and LAN Technology 51
5 Mobile Internet Access
 Handheld device services include:
– Short message ser...
Chapter 5: Internet and LAN Technology 52
5 Mobile Internet Access
 Cellular service options
Chapter 5: Internet and LAN Technology 53
5 Internet Connection Roundup
CHAPTER 5 COMPLETE
Internet and LAN Technology
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  1. 1. Internet and LAN Technology CHAPTER 5
  2. 2. Chapter 5: Internet and LAN Technology 2 5 Chapter Contents  Section A: Network Building Blocks  Section B: Local Area Networks  Section C: Internet Technology  Section D: Internet Access
  3. 3. Chapter 5: Internet and LAN Technology 3 5 SECTION A Section A: Network Building Blocks  Network Advantages and Challenges  Network Classifications  Geographic Scope: PANs, NANs, LANs, MANs, and WANs  Organizational Structure: Client/Server and Peer-to-Peer  Physical Topology
  4. 4. Chapter 5: Internet and LAN Technology 4 5 SECTION A Section A: Network Building Blocks  Network Links  Analog and Digital Signals  Bandwidth  Communications Protocols
  5. 5. Chapter 5: Internet and LAN Technology 5 5 Network Advantages and Challenges  Sharing networked hardware can reduce costs  Sharing networked hardware can provide access to a wide range of services and specialized peripheral devices  Sharing networked software can reduce costs  Sharing data on a network is easy  Networks enable people to work together regardless of time and place
  6. 6. Chapter 5: Internet and LAN Technology 6 5 Network Advantages and Challenges  Networks may be vulnerable to unauthorized access from many sources and locations – More vulnerable than standalone computers  Wireless networks can be tapped from a “snooping” computer  Networked computers are susceptible to an increasing number of worms, Trojan horses, and blended threats
  7. 7. Chapter 5: Internet and LAN Technology 7 5 Network Classifications
  8. 8. Chapter 5: Internet and LAN Technology 8 5 Geographical Scope: PANs, NANs, LANs, MANs, and WANs  Personal Area Network (PAN) – interconnection of personal digital devices  Neighborhood Area Network (NAN) – connectivity spread over several buildings  Local Area Network (LAN) – usually connects computers in a single building  Metropolitan Area Network (MAN) – public high- speed network with range of about 50 miles  Wide Area Network (WAN) – consists of several smaller networks
  9. 9. Chapter 5: Internet and LAN Technology 9 5 Organizational Structure: Client/Server and Peer-to-Peer
  10. 10. Chapter 5: Internet and LAN Technology 10 5 Physical Topology  Arrangement of devices in a network  Each connection point on a network is referred to as a node  A bridge can connect two similar networks  A gateway joins two dissimilar networks – Router
  11. 11. Chapter 5: Internet and LAN Technology 11 5 Physical Topology
  12. 12. Chapter 5: Internet and LAN Technology 12 5 Physical Topology
  13. 13. Chapter 5: Internet and LAN Technology 13 5 Network Links  Wired network – Twisted-pair cable – Coaxial cable – Fiber-optic cable  Wireless network – RF signals – Microwaves – Infrared light
  14. 14. Chapter 5: Internet and LAN Technology 14 5 Analog and Digital Signals
  15. 15. Chapter 5: Internet and LAN Technology 15 5 Bandwidth  The transmission capacity of a communications channel – High-bandwidth channel (broadband) • Cable TV • DSL – Low-bandwidth channel (narrowband) • Telephone system
  16. 16. Chapter 5: Internet and LAN Technology 16 5 Communications Protocols  Rules for efficiently transmitting data from one network node to another – Dividing messages into packets – Affixing addresses to packets – Initiating transmission – Regulating the flow of data – Checking for transmission errors – Acknowledging receipt of transmitted data
  17. 17. Chapter 5: Internet and LAN Technology 17 5 Communications Protocols  A packet is a “parcel” of data that is sent across a computer network – Circuit-switching technology vs. packet switching technology • Voice over IP (VoIP)
  18. 18. Chapter 5: Internet and LAN Technology 18 5 SECTION B Section B: Local Area Networks  LAN Standards  Ethernet  Wi-Fi  HomePNA and HomePLC Networks  Installing a LAN  Using a LAN
  19. 19. Chapter 5: Internet and LAN Technology 19 5 LAN Standards  LAN Technologies are standardized by the IEEE – ARCnet – Token Ring technology – FDDI – Ethernet – Wi-Fi
  20. 20. Chapter 5: Internet and LAN Technology 20 5 Ethernet  Simultaneously broadcasts data packets to all network devices – IEEE 802.3 – CSMA/CD protocol
  21. 21. Chapter 5: Internet and LAN Technology 21 5 Ethernet On an Ethernet, data travels on a “first come, first served” basis. If two workstations attempt to send data at the same time, a collision occurs. That data must be resent. CLICK TO START
  22. 22. Chapter 5: Internet and LAN Technology 22 5 Ethernet  Varies in speed from 10 Mbps to 10 Gbps  An Ethernet card is designed to support the Ethernet protocols  Ethernet hubs link workstations via cables – Uplink port
  23. 23. Chapter 5: Internet and LAN Technology 23 5 Wi-Fi  Wireless networking technologies that are compatible with Ethernet
  24. 24. Chapter 5: Internet and LAN Technology 24 5 Wi-Fi  WEP (Wired Equivalent Privacy) encrypts data traveling over wireless networks  Equipment required for a wireless network – Wi-Fi card – Wireless access point  Bluetooth is a short-range wireless network technology
  25. 25. Chapter 5: Internet and LAN Technology 25 5 HomePNA and HomePLC Networks  HomePNA networks utilize existing telephone wiring to connect network devices – Special NICs and cables are required  HomePLC networks transmit data over power lines as low-frequency radio waves
  26. 26. Chapter 5: Internet and LAN Technology 26 5 Installing a LAN CLICK TO START
  27. 27. Chapter 5: Internet and LAN Technology 27 5 Using a LAN In this drive mapping example, a server’s drive C is mapped as drive F by a workstation. After the mapping is complete, the server’s hard disk appears in the workstation’s directory as drive F and can be used just as though it were a drive connected directly to the workstation. CLICK TO START
  28. 28. Chapter 5: Internet and LAN Technology 28 5 Using a LAN  You can allow other network users to view and edit files in the folders you’ve designated as shared
  29. 29. Chapter 5: Internet and LAN Technology 29 5 Using a LAN  The Network Connection tool helps you troubleshoot connection problems
  30. 30. Chapter 5: Internet and LAN Technology 30 5 SECTION C Section C: Internet Technology  Background  Internet Structure  ISP Infrastructure  Internet Protocols  IP Addresses  Domain Names
  31. 31. Chapter 5: Internet and LAN Technology 31 5 Background  The Advanced Research Projects Agency designed ARPANET  The Internet has an estimated 200 million nodes and 500 million users today
  32. 32. Chapter 5: Internet and LAN Technology 32 5 Internet Structure
  33. 33. Chapter 5: Internet and LAN Technology 33 5 Internet Structure  Ping is used to find out whether a site is up and running  The Traceroute utility records a packet’s path
  34. 34. Chapter 5: Internet and LAN Technology 34 5 ISP Infrastructure
  35. 35. Chapter 5: Internet and LAN Technology 35 5 Internet Protocols  TCP and IP serve as the primary protocols responsible for message transmission on the Internet
  36. 36. Chapter 5: Internet and LAN Technology 36 5 IP Addresses  IP addresses are addresses that identify computers on the Internet – Static IP address – Dynamic IP address
  37. 37. Chapter 5: Internet and LAN Technology 37 5 Domain Names  Easy-to-remember names for Internet servers – Ends with an extension that indicates its top-level domain  Every domain name corresponds to a unique IP address – Domain Name System  ICANN coordinates technical management of the Internet’s Domain Name System
  38. 38. Chapter 5: Internet and LAN Technology 38 5 Domain Names
  39. 39. Chapter 5: Internet and LAN Technology 39 5 Domain Names The first step in registering a domain name is to find out whether the name is currently in use or reserved for future use. If a domain name is not available, consider using a different top-level domain, such as biz instead of com. After you’ve found an available domain name you like, you can continue the registration process by filling out a simple online form. CLICK TO START
  40. 40. Chapter 5: Internet and LAN Technology 40 5 SECTION D Section D: Internet Access  Dial-up Connections  Cable Internet Service  DSL, ISDN, and Dedicated Lines  Wireless Internet Services  LAN Internet Access  Mobile Internet Access  Internet Connection Roundup
  41. 41. Chapter 5: Internet and LAN Technology 41 5 Dial-up Connections  Uses POTS to transport data between your computer and your ISP  A modem converts digital signals from your computer into analog signals that can travel over telephone lines, and vice versa – Modulation / Demodulation
  42. 42. Chapter 5: Internet and LAN Technology 42 5 Dial-up Connections  Modems are still required, despite digital telephone technology  Modem speed is measured as baud rate  Many Internet connection methods provide faster downstream transmission rates than upstream rates
  43. 43. Chapter 5: Internet and LAN Technology 43 5 Cable Internet Service
  44. 44. Chapter 5: Internet and LAN Technology 44 5 Cable Internet Service  Cable modems convert your computer’s signal into one that can travel over the CATV network  Always-on connection  Neighborhood network
  45. 45. Chapter 5: Internet and LAN Technology 45 5 DSL, ISDN, and Dedicated Lines  DSL is a high-speed, digital, always-on Internet access technology that runs over standard telephone lines – DSLAM – Most DSL installations require service technicians • DSL modem
  46. 46. Chapter 5: Internet and LAN Technology 46 5 DSL, ISDN, and Dedicated Lines  ISDN connections are slower than DSL and cable Internet service, but faster than dial-up – ISDN terminal adapter connects a computer to a telephone wall jack and converts signals to travel over ISDN connection  T1, T3, and T4 lines are leased from the telephone company, and offer fast, high- capacity data transmission
  47. 47. Chapter 5: Internet and LAN Technology 47 5 Wireless Internet Service  Direct satellite service (DSS)
  48. 48. Chapter 5: Internet and LAN Technology 48 5 Wireless Internet Service  Fixed wireless Internet service broadcasts RF signals in order to offer Internet access to large areas – WiMAX – Wireless service providers are usually local or regional businesses
  49. 49. Chapter 5: Internet and LAN Technology 49 5 LAN Internet Access  Cost-effective way to share one Internet connection among several computers  To establish LAN Internet access, you need: – An operational wired or wireless LAN – A router or a hub with router capabilities – A high-speed Internet connection, such as DSL, ISDN, or cable Internet – A modem that corresponds to your Internet connection type
  50. 50. Chapter 5: Internet and LAN Technology 50 5 Mobile Internet Access  A Wi-Fi hotspot is a wireless broadband Internet service offered in a public location – WISP  WAP is a communications protocol that provides Internet access from handheld devices
  51. 51. Chapter 5: Internet and LAN Technology 51 5 Mobile Internet Access  Handheld device services include: – Short message service (SMS) – Multimedia messaging (MMS) – Music fingerprinting – Games – City guides – E-mail – News, sports, stocks, and weather
  52. 52. Chapter 5: Internet and LAN Technology 52 5 Mobile Internet Access  Cellular service options
  53. 53. Chapter 5: Internet and LAN Technology 53 5 Internet Connection Roundup
  54. 54. CHAPTER 5 COMPLETE Internet and LAN Technology
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