Transcript Network Concepts

Network Concepts
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THE BASICS – SYSTEM UNIT COMPONENTS
HNC COMPUTING - Network Concepts
Aims
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 Recap on previous sessions
 Discuss OSI 7 layer module
 All students will be able to discuss the attributes of
network planning
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(i.e what to consider...cost, ongoing support, security etc.)
 Most student will understand the implications of setting
up and expanding a network
 Some student will Identify and discuss the differences
between various network topologies
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(ring, bus, star mesh etc.)
 Understand the purpose of a network
HNC COMPUTING - Network Concepts
What is covered in this Unit?
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 Benefits of networks
 Network principles
 Definition of a Network (WANS, LANS etc)
 Network Use (network resources)
 Design/evaluation
 Network architecture concepts (OSI 7 layer model)
 Network design
HNC COMPUTING - Network Concepts
What is covered in this Unit? – Cont.
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 Network software
 User factors (directory structures)
 Login scripts (user environments)
 Hardware and Software factors
 Network management
 Management responsibilities
 Resource management
HNC COMPUTING - Network Concepts
What is the purpose of a network?
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 Enables file sharing (should cut down on printing
costs)
 Share resources, such as printers, scanners, etc.,
to get more use out of office equipment (cutting
down costs)
 Share software with multi-user licenses.
 Perform data backups quicker and easier with
files on shared drives.
 Easier and more manageable Internet connection
HNC COMPUTING - Network Concepts
Types of Network
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 LAN (Local area network)
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The definition of a LAN has become increasingly vague
over the last ten years.
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It was understood that it was interconnected computers
at one location i.e. college or a workplace.
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Now, due to faster technology LAN devices can be used
over longer distances.
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A LAN can be as small as two computers by using a
simple Ethernet connection or can divided into sub
networks using switches and routers.
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Task
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 Using Visio try to recreate the LAN shown below.
(Feel free to make it your own)
HNC COMPUTING - Network Concepts
Types of Network
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 WAN (Wide area network)
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A WAN is a complex network system, comprising of
interconnected LANs.
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WANs are used to connect LANs and other types of
networks together, so that users and computers in one
location can communicate with users and computers in
other locations.
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WANs are often built using leased lines.
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Network protocols including TCP/IP deliver transport
and addressing functions.
HNC COMPUTING - Network Concepts
Several options are available for WAN connectivity:
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http://en.wikipedia.org/wiki/Wide_area_network
HNC COMPUTING - Network Concepts
WAN
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HNC COMPUTING - Network Concepts
Types of Network
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 MAN (Metropolitan area networks)
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A Metropolitan Area Network (MAN) is a large computer network
that spans a metropolitan area or campus. The network size falls
intermediate between LANs and WANs.
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MANs provide Internet connectivity for LANs in a metropolitan
region, and connect them to wider area networks like the Internet.
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They typically use wireless infrastructure or optical fiber (or fibre)
connections to link their sites.
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A MAN (like a WAN) is not generally owned by a single
organisation. The MAN, its communications links and equipment
are generally owned by either a consortium of users or by a
network service provider who sells the service to the users.
HNC COMPUTING - Network Concepts
Types of Network
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 Mesh network
 A netlike communications network in which there are at least
two pathways to each node.
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A fully meshed network means that every node has a direct
connection to every other node. Most mesh networks are
partially meshed and require traversing nodes to go from each
node to every other.
HNC COMPUTING - Network Concepts
Task
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 Go on the internet and try to identify other types of
networks.
 Here some ideas: PANs, CAMs,VLANs, please write
down your findings and/or store web links.
 Using the internet look into what a packet is.
HNC COMPUTING - Network Concepts
Task - JANET
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 http://www.emman.net/
 Find out about a network created by academic
environments called “Janet”.
 What is the different between Janet and
“SuperJanet”.
 Write notes and/or store web links.
 Create a network diagram in Visio to represent
“SuperJanet”.
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HNC COMPUTING - Network Concepts