computer networking

1. Presented by: Mehrun-Nisa
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2. Computer network
A collection of computing devices that are connected in
various ways in order to communicate and share resources.
Usually, the connections between
computers in a network are made using
physical wires or cables.
However, some connections are wireless, using radio waves or
infrared signals.
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3.  Network Topology
how is hardware (physically) connected?
 Addressing
how is a message’s destinations identified?
 Message Delivery
should all data be sent in the same fashion?
 Routing
what path through the network is taken?
 Security
how can strangers pass (private) messages?
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4.  Node (host)
Any device on a network.
 Data transfer rate (bandwidth)
The speed with which data is moved from one place to
another on a network.
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5.  Local-area network (LAN) A network that connects
a relatively small number of machines in a relatively
close geographical area.
Usually connected using Ethernet .
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6.  Wide-area network (WAN) A network that connects
two or more local-area networks over a potentially large
geographic distance
Often one particular node on a LAN is set up to serve as a
gateway to handle all communication going between that LAN
and other networks
Communication between networks is called internetworking
The Internet, as we know it today, is essentially the ultimate
wide-area network, spanning the entire globe.
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7.  Metropolitan-area network (MAN) The
communication infrastructures that have been
developed in and around large cities.
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8. Resource Sharing
Hardware (computing resources, disks, printers).
Software (application software).
Information Sharing
Easy accessibility from anywhere (files, databases).
Search Capability (WWW).
Communication
Email
Message broadcast
E-Commerce
News Groups
Video Conferencing
Chat Groups
Internet Radio
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9.  Learn about Computer Networking
 Types
 Applications
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