Week 1
 Describe
how networks impact
our daily lives
 Describe the role of data
networking in the human
network
 Identify the key components of
any data network

Discuss with your peers
◦ How networks impact our daily lives
◦ Role of data networking in human
networks
◦ Identify the
 Opportunities presented
 Challenges posed by modern
networks
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CSY1017-Computer Communications
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Using information networks to share and
collaborate improves teaching and learning
Popular
communication
media
– Instant messaging
– Weblogs (Blogs)
– Podcasting
– Wikis
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◦Intranets:
Private networks in use by
just one company, enable
businesses to communicate
and perform transactions
among global employee and
branch locations.
◦Extranets:
To provide suppliers,
vendors, and customers
limited access to corporate
data to check order status,
inventory, and parts lists.

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Explore places of
interest interactively or
preview actual
destinations before a
trip
Posting photographs
about an event online
for others to view
Participate in online
games
Preview motion pictures


Establishing the Rules
. Among the protocols that
govern successful human
communication are:
◦An identified sender and
receiver
◦Agreed upon method of
communicating (face-to-face,
telephone, letter, photograph)
◦Common language and
grammar
◦Speed and timing of delivery
◦Confirmation or
acknowledgement requirements

Factors affecting message travel
between can be either external or
internal.
◦External Factors
 The quality of the pathway between
the sender and the recipient
 The number of times the message
has to change form
 The number of times the message
has to be redirected or readdressed
 The number of other messages
being transmitted simultaneously on
the communication network
 The amount of time allotted for
successful communication
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Rules or agreements to govern the messages are
sent, directed, received and interpreted
The messages or units of information that travel
from one device to another
A means of interconnecting these devices – a
medium that can transport the messages from one
device to another
Devices on the network that exchange messages
with each other
C
h
1
1
1
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Rules govern every
step of the process,
from the way cables
are designed to the
way the digital
signals are sent
These rules are called
protocols, e.g. TCP/IP
protocol stack

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Icons are commonly used to represent
networking devices.
Some devices originate messages that
comprise our communication.
Some devices are used to direct and manage
messages across the network.
◦Switch – A common device for
interconnecting local area networks
◦Firewall - provides security to networks
◦Router - helps direct messages as they
travel across a network
◦Wireless Router
◦Cloud - used to summarize a group of
networking devices
◦Serial Link - one form of interconnection,
represented by the lightning bolt-shaped
line

Connectivity
◦ Speed, data rate, bandwidth

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Quality
Availability
◦ Fault Tolerance
 Redundancy, backup..
◦ Recovery

Mitigating Threat
◦ Security
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Communications
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This week we looked at:
How computer networks impact our lives?
What is computer communications
◦ Four major elements that constitute a computer
network
◦ Protocol: basic definition
◦ Glossary of network elements

Computer Network Architectures
◦ Types
 Centralised Systems
 Distributed Systems
 Client Server
 Peer-to-peer
◦ Characteristics
 Tiered Structure
◦ Communication networks components
◦ Challenges
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Communications
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