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Introduction - FTP

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Introduction - FTP Powered By Docstoc
					Networks, Network operating
systems




                              PPT 8.2.1
Networking - Basics
   Network defined
   The difference between Standalone
    and networked Systems
   Advantages of networking
   Disadvantages of networking
   Why use network
       To share information
       To Share hardware and software
       Centralizing administration

                                         PPT 8.2.2
Types of networks

   Classification based on
    geographical area
       LAN
       WAN




                              PPT 8.2.3
Local Area Networks

   Limited geographic area
   High speed and error free data
    transmission
   Not expensive




                               PPT 8.2.4
Wide Area Networks

   Connects computers over
    states, countries etc.,
   Unlimited geographical
    coverage
   More sophisticated
   Connects LANs and MANs
   Expensive technology

                              PPT 8.2.5
Network configuration

   Classification based on how
    computers behave in a network
   Two classifications are
       Peer-to-Peer network
       Server based network




                               PPT 8.2.6
Peer-to-Peer network
   Nodes provide and request
    services
   User in each node administers
    resources
   No extra investment
   Easy to setup
   Very weak security
   Additional load on nodes
                              PPT 8.2.7
Server based network

   Designated computer to
    administer
   Resources centralized
   Supports larger networks
   Strong security
   Expensive


                               PPT 8.2.8
Network hardware

   Hub
   Cables
   Connectors
   Switches
   Routers



                   PPT 8.2.9
Hub
   Standard component in
    network
   Types
       Active, Passive
       Manageable
   Easier administration
   Centralized monitoring of
    network
                                PPT 8.2.10
Cables
   Wires the LAN, usually
   Transmit signals through network
   Different cable considerations
    according to need
   Types
       Co-axial
       Twisted Pair
       Fiber-optic

                                 PPT 8.2.11
Co-axial cable
             Most trusted in
              earlier networks
             Carries data as
              electromagnetic
              signals
             Good resistance
              against
              interference

                            PPT 8.2.12
Twisted pair
             Pair of insulated
              copper wires
             Types
                 Shielded(STP)
                 Unshielded(UTP)
             UTP common in LAN
             Max. cable length –
              100 meters

                                    PPT 8.2.13
Fiber optic cables

          Core – cylinder of glass
          Not subject to
           interference
          Transfer rate – more
           than 100 mbps
          Expensive


                              PPT 8.2.14
Connectors for UTP
             RJ – 11 and RJ –
              45
             RJ11 in telephone
              cables – 4 cable
              connections
             RJ45 in LAN cables
              – 8 cable
              connections

                            PPT 8.2.15
Network adapter card

           Prepares data from
            computer for
            network and sends
           Receives data from
            network and
            translates for
            computer

                            PPT 8.2.16
Using IP address
   Two methods
       Static addressing
       Using DHCP
   Two components
       Network ID
       Host ID
   3 classes
       Class A networks
       Class B networks
       Class C networks

                            PPT 8.2.17
Network troubleshooting

   In case of problems
       Check   Physical connection first
       Check   power supply in the hub
       Check   sample packet transfer
       Check   configuration




                                       PPT 8.2.18
Network operating systems
   Co-ordinates hardware and
    software
   Ties together all computers
    and peripherals
   Provides security by controlling
    access to resources and
    peripherals shared
   Manages users

                               PPT 8.2.19
Network operating systems
available

   Windows NT
   Windows 2000 & Windows
    Server 2003
   Netware from Novell
   Unix
   Apple Macintosh


                             PPT 8.2.20
Shares
   Sharing allows access to resources
    over network
   Folders and devices are directly
    shared; not files or programs
   Permissions for access can be
    assigned to users and groups
    Level of permission can be varied


                                  PPT 8.2.21
User accounts
 Local User Accounts

    Enable users to log on and access resources on a
     specific computer

  Domain User Accounts
    Enable users to log on to the domain to gain access to
     network resources
    Reside in Active Directory

  Built-in User Accounts
    Enable users to perform administrative tasks or gain
     temporary access to network resources
    Reside in SAM (local built-in user accounts)
    Reside in Active Directory (domain built-in user
     accounts)                                                PPT 8.2.22
User Access issues


             Domain Logon
             Access verification
             Grant/deny access




                             PPT 8.2.23
Password Security
   Do not allow blank passwords
   Assign a Password for the Administrator
    Account
   Determine Who Has Control over
    Passwords
   Educate Users on How to Use Passwords
       Avoid obvious associations, such as a family name
       Use long passwords
       Use a combination of uppercase and lowercase
        characters




                                                    PPT 8.2.24
Installing network printer

   Involves
       Installing the printer
       Configuring
       Sharing
       Administering




                                 PPT 8.2.25
This completes the unit

        Thank you

				
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