Amit Ppt on Network

8/3/2019 Amit Ppt on Network

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NETWORKS

A network consists of two

or more computers that

are linked in order to

share resources (such as

printers and CD-ROMs),

exchange files, or allow

electronic

communications.

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TYPES OF NETWORKING

LAN - Local Area Network

WAN - Wide Area Network

WLAN - Wireless Local Area Network

MAN - Metropolitan Area Network

CAN - Campus Area Network, Controller Area Network,

or sometimes Cluster Area Network


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Contd SAN - Storage Area Network, System Area Network,

Server Area Network, or sometimes Small Area Network

PAN - Personal Area Network

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LAN - Local Area Network

A Local Area Network

(LAN) is a combination

of programs and

equipment that connect a

number of personal

computers.

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WAN - Wide Area Network

A Wide Area Network

(WAN) is a collection

ofLANs.

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WLAN - Wireless Local Area

Network A LANbased on WiFi

wireless network

technology .

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MAN -Metropolitan Area Network

A network spanning a

physical area larger than a

LAN but smaller than a

WAN, such as a city.

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CAN - Campus Area Network

A campus areanetwork

(CAN) is a computer

network made up of an

interconnection of local

area networks (LANs)

within a limited

geographical area.

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SAN - Storage Area Network

A storage areanetwork

(SAN) is a high-performance

subnet, probably (but not

necessarily) based on fibrechannel, whose primary

purpose is the transfer of data

between computer systems

and storage elements and

among multiple storageelements.

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PAN - Personal Area Network

A Personal Area Network

(PAN) is a computer

network used for

communication amongcomputer devices (including

telephones and personal

digital assistant) close to

one person.

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ADVANTAGES OF NETWORK

Program Security

More Secure Personal Work Files

Reduced Need for Floppy Disks

Shared Files

Shared Printers

Shared Resources

Easy Maintenance

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DISADVANTAGES OF NETWORK

Server faults stop applications being available .

Network faults can cause loss of data.

Network fault could lead to loss of resources .

User work dependent upon network .

System open to hackers .

Decisions tend to become centralised .

Could become inefficient .

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Contd..

Could degrade in performance .

Resources could be located too far from users.

Network management can become dif .

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Network Topologies

Networktopology is the study of the arrangement or mapping

of the elements (links, nodes, etc.) of a network.

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Types ofNetwork Topologies

Bus (Linear, Linear Bus)

Star

Ring

Mesh

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Contd..

Tree

Hybrid

Point to Point

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BUS Topology

A linear bus topology

consists of a main run of

cable with a terminator at

each end .All nodes (file

server, workstations, and

peripherals) are connected

to the linear cable.

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Star Topology

A star topology is

designed with each node

(file server, workstations,

and peripherals)

connected directly to a

central network hub or

concentrator

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Ring Topology

A star-wired ring

topology may appear

(externally) to be the same

as a star topology.Internally, the MAU

(multistation access unit)

of a star-wired ring

contains wiring that

allows information to passfrom one device to

another in a circle or ring.

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Tree Topology

A tree topology combines

characteristics of linear

bus and star topologies. It

consists of groups of star-

configured workstations

connected to a linear bus

backbone cable.

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Mesh Topology

Mesh Network is a

network where all the

nodes are connected to

each other and is a

complete network.

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Hybrid Topology

The topology that

combines more than one

topology is calledhybrid topology. This

topology is used to

connect a network that

is divided into smaller

sections also known assegments.

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Point-to-Point Topology

The connects two

participants (points).

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Considerations WhenChoosinga

Topology:

Money.

Length of cable needed.

Future growth.

Cable type

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Selectinga Topology

Topology Advantages Disadvantages

Bus Use of cable is economical.Media is inexpensive and easy

to work with.

System is simple and reliable.

Bus is easy to extend.

Network can slow down in

heavy traffic.

Problems are difficult to

isolate.

Cable break can affect manyusers.

Ring System provides equal accessfor all computers.

Performance is even despite

many users.

Failure of one computer can

impact the rest of the network.

Problems are hard to isolate.

Network reconfiguration

disrupts operation.

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Contd..


Star Modifying system and addingnew computers is easy.

Centralized monitoring and

management are possible.

Failure of one computer does not

affect the rest of the network.

If the centralized point

fails, the network fails.

Mesh System provides increasedredundancy and reliability as wellas ease of troubleshooting.

System is expensive to

install because it uses a lotof cabling.

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Contd..


Tree Point-to-point wiring forindividual segments.

Supported by several

hardware and software

venders.

Overall length of each segment

is limited by the type of cabling

used.

If the backbone line breaks, the

entire segment goes down.

Hybrid Wiring systems can bechanged or expanded as

needed.

Different ports can be usedto accommodate a variety of

cabling types.

yVery expensive.

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Conclusion

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Amit Ppt on Network