This document contains information about computer networks presented by Darshit Narechania. It defines a computer network as two or more connected computers that share resources and exchange files. The need for networks is described as file sharing, resource sharing, communication, remote access, and data protection. Common connection devices include routers, gateways, repeaters, bridges, hubs, and modems. The main types of networks covered are local area networks (LANs), wide area networks (WANs), and metropolitan area networks (MANs). LANs connect computers in a small local area like a home or office, while WANs connect LANs over a larger area like a college campus or between cities. MANs interconnect

1. M.P.V.VALIA COLLEGE OF
COMMERCE
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NAME : Narechania Darshit
STD : T.Y.B.COM DIV : B
ROLL NO : 205
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2. INDEX
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3. Presented by:
Darshit Narechania
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4. Computer Network:
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 A network consists of two or more computers that
are linked in order to share resources, exchange files,
or allow electronic communications.
 The computers on a network may be linked through
cables, telephone lines, radio waves, satellites, or
infrared light beams
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5. Need of Computer Network:
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 File sharing
 Resource sharing
 Communication and collaboration
 Remote access
 Data protection
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6. Devices Use To Connect Network:
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 Routers
 Gateways
 Repeaters
 Bridges
 Hub
 Modem
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7. Types Of Network:
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 Local Area Network
 Wide Area Network
 Metropolitan Area Network
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8. Local Area Network:
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 A local area network (LAN) is a group of computers
and associated devices that share a common
communications line or wireless link.
 Typically, connected devices share the resources of a
single processor or server within a small geographic
area .
 . A local area network may serve as few as two or
three users or as many as thousands of users.
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10. Wide Area Network:
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 The WAN is a communications network that makes
use of existing technology to connect local
computer networks into a larger working network
that may cover both national and international
locations.
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12. Metropolitan Area Network (MAN):
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 A metropolitan area network (MAN) is a network that
interconnects users with computer resources in a geographic
area or region larger than that covered by even a large local
area network but smaller than the area covered by a wide area
network (WAN).
 It is also used to mean the interconnection of several local area
networks by bridging them with backbone lines
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13. Network Topologies
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 Network Topology – Maps of how the physical or logical paths of network devices
connect. The three major topologies are star, ring, and bus.
 Star Topology – Most common Ethernet network topology where each device
connects to a central hub or switch.
 Hub – A device used with the Universal Serial Bus or in a star network topology that
allows multiple device connections.
 Switch – In star networks, a Layer 2 central controlling device. A switch looks at
each data frame as it comes through each port.
 Ring Topology – Network that is physically wired like a star network but, logically
in a ring; passes control from one device to the next in a continuous fashion using a
special data packet called a token. Used in Token Ring networks.
 Bus Topology – Network wherein all devices connect to a single cable. If the cable
fails, the network is down.
 Mesh Topology – Network where all devices connect to each other by cabling to
provide link redundancy for maximum fault tolerance. Most likely in WANs.
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14. Hub/Switch
Network Topologies
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15. Star Topology
Network Topologies
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16. Logical Ring Topology
Network Topologies
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17. Bus Topology
Network Topologies
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18. Network Topologies
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