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Telecommunications, Networks and the Internet

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Chapter 8 Telecommunications, Networks and the Internet Included in this presentation Networking technologies Transmission media, types of networks, networking ... – PowerPoint PPT presentation

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Title: Telecommunications, Networks and the Internet


1
Chapter 8
  • Telecommunications, Networks and the Internet

2
Included in this presentation
  • Networking technologies
  • Transmission media, types of networks, networking
    services
  • Role of the Internet
  • Communication and e-business tools
  • Challenges of networking

Louden and Louden 2006
3
Background
  • Two different types of telecommunications
  • Telephone Networks for voice communication
  • Computer Networks for data traffic
  • Telephone networks were regulated monopolies
  • Forced divestiture of ATT and the Bell Companies
    (1984)

Louden and Louden 2006
4
Background (Continued)
  • Telecommunications Act of 1990
  • Allowed long-distance companies to enter the
    local exchange service
  • Allowed the local exchange companies to enter the
    long-distance market
  • Thus, the birth of many new technology trends

Louden and Louden 2006
5
Current Trends in Networking and Communications
  • Rapid technological innovation
  • Deregulation has spurred competition in the
    telecommunications industry
  • Blurred distinctions between voice, video and
    data service providers
  • Rapid growth in Last-Mile service
  • Rapid growth in wireless services/devices

Louden and Louden 2006
6
By Definition.
  • A Network is the linking of two or more
    computers to share data or resources.

Louden and Louden 2006
7
Networking Hardware
  • NIC Network Interface Card
  • Modem

Photos taken by Cheryl Purdy
8
Networking Hardware (Continued)
  • Cable Modem
  • Transmission Media

Photos taken by Cheryl Purdy
9
Networking Hardware (Continued)
  • Hubs and Switches
  • Routers

Photos from www.cisco.com
10
Networking Hardware
  • Wiring Closet
  • Server(s)

Photos taken by Cheryl Purdy
11
Types of Networks
  • Client/Server
  • All client stations are connected to a server to
    share resources
  • Peer-to-peer
  • Resource sharing without a central server

Louden and Louden 2006
12
Types of Networks (Continued)
  • LAN (Local Area Network)
  • Connection of devices within a half mile
  • CAN (Campus Area Network)
  • Connections of up to 1000 meters
  • MAN (Metropolitan Area Network)
  • Connection within a city type of area
  • WAN (Wide Area Network)
  • Connection over broad geographical areas

Louden and Louden 2006
13
Topologies
  • Network topology defines the structure of the
    network. One part of the topology definition is
    the physical topology, which is the actual layout
    of the wire or media. The other part is the
    logical topology, which defines how the hosts
    access the media to send data.

Cisco Networking Academy Curriculum
14
Broadband Services and Technologies
Frame Relay Packages data into frames creates virtual circuits to carry data from remote LANs to a WAN.
ATM ATM (Asynchronous Transfer Mode) is a technology that is capable of transferring voice, video, and data through private and public networks. It is a cell-based technology rather than on a frame-based technology.
ISDN ISDN (Integrated Services Digital Network), a dial-up service, turns the local loop into a digital connection for voice, data, image and video.
Cisco Networking Academy Curriculum Louden and
Louden 2006
15
Broadband Services and Technologies (Continued)
DSL DSL (Digital Subscriber Line) is a broadband technology that uses existing twisted-pair telephone lines to transport high-bandwidth data.
Cable Modem Modems designed for high-speed transmissions using the same coax lines that transmit cable television.
T Lines Dedicated lines for high-speed secure transmissions.
Cisco Networking Academy Curriculum Louden and
Louden 2006
16
Packet Switching
  • Packet Switching divides the data into packets
    and transmits them along different data paths to
    the same end location.
  • The packets are then reassembled at the
    destination point.

Louden and Louden 2006
17
The Internet
  • Developed in the early 1970s by the Department of
    Defense.
  • The DoD wanted to create an information
    infrastructure that could withstand any
    conditions.
  • ISP (Internet Service Provider)
  • Provides connection to homes and small businesses

Louden and Louden 2006
18
The Internet (Continued)
  • Internet addressing
  • Each device connected to the Internet has a
    unique IP (Internet Protocol) address
  • The Microsoft Website can be reached by entering
    the address www.microsoft.com or 207.46.250.110
  • DNS
  • DNS (Domain Name Service) controls the assigning
    of the domain names to IP addresses

Louden and Louden 2006
19
The Internet (Continued)
.org Nonprofit organizations
.com Commercial entities
.gov U.S. Government
.edu Educational Institutions
.mil U.S. Military
.net Network computers (Usually ISPs)
.biz (New) Business Firms
.info (New) Information providers
  • Domain Extensions

Louden and Louden 2006
20
The Internet (Continued)
  • IPV4 vs IPV6
  • IPV4
  • 32-bit dotted quad notation
  • Up to 4 billion addresses
  • IPV6
  • 128-bit addressing scheme
  • Over a quadrillion possible unique addresses

Louden and Louden 2006
21
The Internet (Continued)
  • Governing bodies
  • IAB
  • ICANN
  • InterNIC
  • IESG
  • IETF
  • ISOC
  • W3C

Louden and Louden 2006
22
The Internet (Continued)
  • Unique Features of Internet Technology
  • Ubiquity
  • Global Reach
  • Universal Standards
  • Richness
  • Interactivity
  • Information Density
  • Personalization/Customization

Louden and Louden 2006
23
The Internet (Continued)
  • Intranet
  • An internal organizational network that provides
    access to data across the enterprise
  • Extranet
  • External network to allow authorized user to
    access the network. For example, allowing
    authorized buyers to obtain cost information
    regarding your products.
  • Firewalls are used to retain security

Louden and Louden 2006
24
Communication and E-Business Tools
  • Messaging Services
  • Over 80 of employees used some sort of IMing
    tools
  • Electronic Discussion Groups
  • Usenet newsgroups
  • Listserves
  • Groupware/Teamware
  • Provides capability for collaborative work in the
    enterprise

Louden and Louden 2006
25
Communication and E-Business Tools (Continued)
  • Electronic Conferencing
  • A virtual conference table where participants can
    share their thoughts using chat, audio, or video.
  • Internet Telephony
  • Using Internet technology for telephone voice
    transmissions over the Internet
  • Uses IP to deliver the voice information using
    packet switching

Louden and Louden 2006
26
Communication and E-Business Tools (Continued)
  • VPN (Virtual Private Network)
  • Based on IP - provides a secure connection
    between two points across the Internet, enabling
    private data to travel over the Internet
  • Many hospitals have VPNs extending to physicians
    homes and offices

Louden and Louden 2006
27
Management Challenges
  • Loss of management control
  • Organizational change requirements
  • Scalability, Reliability, and Security

Louden and Louden 2006
28
Solution Guidelines to Management Challenges
  • Develop a strategic networking plan
  • Know how communication services enhance your
    competitive edge
  • Identify critical areas where network-based
    applications can make a difference in
    performance.
  • Managing the change
  • Reengineer business processes to accompany
    infrastructure changes
  • Address organizational issues

Louden and Louden 2006
29
Resources
  • Louden and Louden 2006
  • Cisco.netacad.net
  • www.cisco.com
  • Carr and Snyder 2003
  • www.easywhois.com
  • www.internic.com
  • www.dslreports.com/distance
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