03 Data Communications and Networking.pptx
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Transcript of 03 Data Communications and Networking.pptx
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Data Communications and Networking
What is a Network?
Defined as two or more computing devices connected together in such a way that they can share resources
Resources:
files
folders
printers
disk drives
etc.
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What is a Network?
A collection of computers or other hardware devices that are connected together, either physically or logically, using special hardware and software, to allow them to exchange information and cooperate
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What is Networking?
Term that describes the process involved in designing, implementing, upgrading, managing, and otherwise working with networks and network technologies
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Advantages of Networking
Connectivity and Communication
Data Sharing
Hardware Sharing
Internet Access
Internet Access Sharing
Data Security and Management
Performance Enhancement and Balancing
Entertainment
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Disadvantages of Networking
Cost of setup
Management and administration costs
Undesirable sharing
Illegal or undesirable behavior
Data security concerns
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Network Interface Card (NIC)
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Circuit board that fits in one of the computers internal expansion slots
Contains circuitry that handles sending, receiving, and error checking of transmitted data
Basic Components of a Network
Server
core component of the network
provides link to the resources necessary to perform any task
Client
requests and receives information over the network client
depends primarily on central server for processing activities
Circuit
cables, ports and other devices that connect the server and the client computers
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Key Points in Networking
Important characteristics that influence transmission technologies and communication protocols
size
shape
Networks are classified according to area over which they extend
Size and extension depend on number of nodes that need to communicate, and where these nodes are in relation to each other
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Network Classifications
PAN (personal area network)
refer to the interconnection of personal digital devices or consumer electronics w/n the range of 30ft (10m) and without the use of wires or cables
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Network Classifications
LAN (local area network)
data communications network the connects personal computers within a very limited geographical area
school computer labs
home networks
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Network Classifications
MAN (metropolitan area network)
public high-speed network capable of voice and data transmission within the range of 50mi (80km)
ISPs
small cable TV companies
local telephone companies
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Network Classifications
WAN (wide area network)
covers large geographical area and usually consists of smaller networks
nationwide banks
large cable TV companies
multi-location superstores
internet
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Network Topologies
Architectural drawings to show the overall physical configuration for a given communications system
Indicates the access methods and governs the rules that are used to design and implement the communication system
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Network Topologies
Bus topology
Single electrical circuit to which all devices in network are connected
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Network Topologies
Star topology
individual computers are connected to a central device such as a hub or a switch
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Network Topologies
Ring topology
a collection of separate point-to-point links arranged to make a ring
each nodes NIC has one input and one output connection
so each node has two links
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Communications Model
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Source
Transmitter
Transmission System
Receiver
Destination
Source System
Destination System
Communications Model
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Personal Computer
Modem
Broadband Connection
Modem
Server