ITM 301 Chapter Notes - Chapter 1: Computer Network, Windows Server 2008 R2, Wide Area Network

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Wednesday September 5th, 2012
Chapter 1:
An Introduction to Networking
Types of Networks:
-network is a group of computers and other devices (such as printers)
that are connected by some type of transmission media
-network can be small as two computers connected by a cable or as
large as several thousands computers connected across the world via
a combination of cables, phone lines, cellular links
-networks can link mainframe computers, printers, plotters, fax
machines, phone systems
-networks can communicate through copper wires, fiber optic cable,
radio waves
-networks allow you to manage, administer, resources on multiple
computers from a central location, network increases productivity
Peer-to-Peer Network:
-simplest form; every computer can communicate directly with every
other computer
-no computer on a peer-to-peer network has more authority than
another
-each computer can be configured to share some of its resources
-often less expensive to set up and maintain
-they are not as secure (disadvantage)
-not practical for connecting more than a handful of computers
because they do not always centralize resources (disadvantages)
-the more computers you add to a peer-to-peer network the harder it is
to mange and find resources
-common way to share resources on this network is by modifying the
file sharing controls via the computers operating system
-resource sharing is not controlled by a central computer because it
depends on how many different users there are and it might not be
secure
Client/Server Network:
-another way designing a computer is using a central computer (known
as a server) to facilitate communication and resource sharing between
other computers on the network which are known as clients
-clients take the form of personal computers (aka workstation or
mobile devices such as smartphones)
-network that uses server to enable clients to share data is known as
client/server network
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Wednesday September 5th, 2012
-you can compare the client/server network with a library, just as a
library manages books and other media by patrons, a server manages
the use of shared resources by clients
-every computer on a client/server network acts as a client or server
-clients on client/server network do NOT share their resources directly
with each other, but rather use the server
-clients and servers communicate through connectivity devices such as
switches or routers
-servers have more memory, processing and storage capacity than
clients
-complex in its design and maintenance however more advantages
-user logon accounts and passwords can be assigned to anyone
-access to multiple shared resources can be centrally granted
-problems on network can be monitored, diagnosed and fixed from one
location
-servers are utilized to handle heavy work load, handle request from
clients and faster response time
Type of Arrangements:
LAN:
-LAN (local area network): network of computers and other devices
that is confined to a small place
Example: room, building, office
-LANs are interconnected and rely on several servers running many
different applications and managing resources other than data
-in a building which runs on its own LAN, and all the LANs are
connected; the network may contain dozens of servers, hundreds of
workstations, storage devices, printers, plotters, fax machine,
telephone interfaces
MAN:
-MAN (metropolitan area network): network larger than LAN and
connects clients and servers from multiple buildings
Example: government offices, city network
-MAN may use different technology because of the distance it covers
WAN:
-WAN (wide area network): network that connects two or more
geographically distinct LANs and MANs
-network carries large data over longer distances than LANs
-most MANs can be described as WANs because networks that cover a
broad geographical range are called WANs
-connects separate offices in the same organization, whether they are
across town or across the world from each other
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