Types of Microcomputers

Document Sample
Types of Microcomputers Powered By Docstoc
					Introduction To Computer
        Systems
                9. Network Connectivity
1. Introduction
A network is any collection of independent computers that
communicate with one another over a shared network medium.

Every network includes:

•At least two computers Server or Client workstation.
•Networking Interface Card's (NIC)
•Connection medium, usually a wire or cable,
although wireless communication is also possible.
•Network Operating system (NOS) software, such
as Microsoft Windows NT or 2000, Novell NetWare,
Unix and Linux.
2. Types of Networks - LAN
LANs (Local Area Networks)
A network is any collection of independent computers that
communicate with one another over a shared network medium.

                                  LANs are networks usually
                                  confined to a geographic area,
                                  such as a single building or a
                                  college campus. LANs can be
                                  small, linking as few as three
                                  computers, but often link hundreds
                                  of computers used by thousands of
                                  people.
3. Types of Networks - WAN
WANs (Wide Area Networks)
Wide area networking combines multiple LANs that are geographically
separate. This is accomplished by connecting the different LANs using
services such as dedicated leased phone lines, dial-up phone lines
(satellite links, and data packet carrier services.


Wide area networking can be as
simple as a modem and remote
access server for employees to dial
into, or it can be as complex as
hundreds of branch offices globally
linked.
4. Categories of Networks
Networks can be divided into 2 main categories:
•Peer-to-Peer
                                     Peer-to-peer
•Server Based                        In peer-to-peer networking there
                                     are no dedicated servers or
                                     hierarchy among the computers.

                                     All of the computers are equal and
                                     therefore known as peers.

                                     Normally each computer serves as
                                     Client/Server and there is no one
                                     assigned to be an administrator
                                     responsible for the entire network.
4. Categories of Networks cont…
Client/Server Model
The term Client/server refers to the
concept of sharing the work involved in
processing data between the client
computer and the most powerful server
computer.

The Client/server network is the most efficient way to:
•Databases and management of applications such as Spreadsheets, Accounting,
Communications and Document management.
•Network management.
•Centralized file storage.
5. Wired Connections
In the network you will commonly find three types of cables used these are:
•Thin / Thick coaxial cable
•Twisted Pair Cable
    •   STP (Shielded Twisted Pair)
    •   UTP (Unshielded Twisted Pair)
•Ethernet Cabling
•Fiber Optic Cable
5. Wired Connections cont…
The most common type of cable used is the Twisted Pair (STP).

Is more common in high-speed networks.
The biggest difference you will see in the
UTP and STP is that the STP use's
metallic shield wrapping to protect the wire
from interference.
The bigger the number the better the
protection from interference. Most
networks should go with no less than a
CAT 3 and CAT 5 is most recommended.
6. Wireless Connections
Wireless connections transfer data without the use of cables or wires.

Generally, warless connections are not as
fast or as reliable as cables but they can
be convenient.


They are very popular technology for small
networks because computers, especially
laptops, can be moved around while
remaining connected to the network.
6. Wireless Connections cont…
Wireless networks normally use radio transmissions which can include:

•   Wi-Fi
    Wireless radio technology that can be
    used to send data between devices
    and computers. You can build a small
    network in a home or office using Wi-Fi
    instead of cables.


    Most mobile phones can use Wi-Fi
    technology to access the internet.
6. Wireless Connections cont…

                 2. Bluetooth
                   Similar to Wi-Fi but only works over
                   short distances and is slower.


                    It is mainly used to send data between
                   two devices such as a mobile phone
                   and headset, or between a digital
                   camera and laptop.
6. Wireless Connections cont…
Wireless networks normally use radio transmissions which can include:

3. 3G
   Another radio technology that is used
   by mobile phone networks.


   It can carry more data than the older
   mobile phone systems.

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:0
posted:7/16/2013
language:English
pages:12