1. Basic Principles of Networking Basic Computer ConceptsØ
Networking is the problem of delivering a
message from a source to a destination.
The problem of giving meaning to these
messages received is called communication.
Computer Interconnections
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2. Basic Computer Concepts Basic Principles of Networking
Use of Computer Networks
Networks for Companies Ø
resource sharing
dynamic rerouting v
Networks for People Ø
access to remote information
person-to-person communication
interactive communication v
Computer Interconnections
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3. Basic Computer Concepts Basic Principles of Networking
Communication Channels Ø
a pathway over which information can be
transferred
information sent over a channel has source
(often called the transmitter), from which the
information originates, and destination (often
called the receiver), to which the information
is delivered
Computer Interconnections
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4. Basic Computer Concepts Basic Principles of Networking
Communication Channels Ø
simplex channel - is a channel whose direction
of transmission is unchanging
half-duplex channel - is a channel in which
the direction may be reversed, but the
transmission does not occur at the same time
full-duplex channel - is a channel that allows
simultaneous exchange in both directions
Types of Transmission Technologies
Point-to-point networks - consist of many
connections to individual pairs of machines
Broadcast networks - all the machines on
the network share a single channel v
Computer Interconnections
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5. Basic Computer Concepts Basic Principles of Networking
Network Topologies Ø
bus network - a common channel connects all
devices
ring network - all messages travel in a ring,
either in clockwise or counterclockwise
direction
Computer Interconnections
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6. Basic Computer Concepts Basic Principles of Networking
Network Topologies Ø
tree network - integrates multiple star
topologies together into a bus
star network - a central connection point
(called the hub) is used and all other devices
connect through it
mesh network - involves the concept of
routes, where a message is sent on the
network can take any of several possible paths
from source to destination
Computer Interconnections
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7. Distributed Systems Basic Computer Concepts
Centralized Data Processing (CDP) is the Ø
conventional way of doing all the processing
and control on centralized computers
Holiday Inn Information System: A Centralized
System Architecture
Computer Interconnections
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8. Distributed Systems Basic Computer Concepts
Distributed Data Processing (DDP) refers to Ø
the manipulation of data using distributed
systems
J. P. Morgan’s Distributed Systems Architecture
Computer Interconnections
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9. Distributed Systems Basic Computer ConceptsØ
Client/Server is an extension of distributed
data processing wherein it provides the best of
both centralized and distributed data
processing
AAA Client/Server Architecture
Computer Interconnections
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10. Distributed Systems Basic Computer ConceptsØ
Local Area Networks (LANs) connect network
devices over relatively short distances and
usually owned by an individual or corporation.
Wide Area Networks (WANs) span a large
physical distance (geographically-dispersed
collections of LANs) and mostly owned by any
one organization but rather exist under
collective or distributed ownership and
management.
Computer Interconnections
* Property of STI
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11. The Internet and World Wide Web
Basic Computer Concepts
The Internet and World Wide Web
Computer Interconnections
* Property of STI
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12. The Internet and World Wide Web
Basic Computer Concepts
The Internet and World Wide Web
Computer Interconnections
* Property of STI
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