Transcript Introduction - Gadjah Mada University

Introduction
to Computer Network and
Data Communication
Widyawan
Learning agenda
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Introduction to Computer Networks
OSI
Application Layer
Transport Layer (TCP/UDP)
IP Address
IP Address, Sub-netting, NAT
Data Link Layer
Mid Semester
Physical Layer
Ethernet
Routing Protocol: static and dynamic
Planning and Cabling Network
Wireless
Management, monitoring and optimizations
Presentation
Final Exam
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Assessment
 40
% tasks
 60 % exam (mid and final)
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Books
 CCNAB,
Cisco Press
 Network+, Sybex
Requirements
Active
 Learn English
 75 % of attendance
 Team work

In this session
Describe how networks impact our daily
lives.
 Describe the role of data networking in the
human network.
 Describe the characteristics of network
architectures: fault tolerance, scalability,
quality of service and security.
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A Little Bit of History
 In
the mid 1960s, mainframe computers were stand
alone devices. Computers from different
manufactures were unable to communicate each
other.
 1969 – ARPANET, first packet switched network
consist of UCLA, Stanford, UC Santa Barbara and
Utah University
 1971 – first email program
 1980’s – Local Area Networks (LANs)
 1990’s – WWW / Internetworking
Network Now
Communication is almost as important to us as our reliance on air, water, food, and shelter.
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Early data networks: character-based
information between connected computer
systems.
Current networks have evolved to carry voice,
video streams, text, and graphics
Converged onto a common platform. Enable
communication instantaneously.
Global communities.
Communication in a Network
Centric World
Forecast
 Route and Map
 Online Banking
 World News
 Social Network

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Instant messaging
 Real
time communication
 between 2 or more people
 based on typed text
 Weblogs
 Email
 Leisure
(Blogs)

Change the way we learn
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Change the way we work
What is Communication
Communication is successful when the message
May
have
to agree
on and
the language
Agree on the
method
used
already
received
confirmedused
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Before beginning to communicate with each
other, we establish rules or agreements to
govern the conversation.
These rules, or protocols, must be followed in
order for the message to be successfully
delivered and understood.
The techniques that are used in network
communications share these fundamentals with
human conversations
The Internet Architecture
Fault Tolerance
 Scalability
 QOS
 Security

Fault Tolerance
Limits the impact of a hardware or
software failure and can recover quickly
when such a failure occurs
 Depend on redundant links, or paths,
between the source and destination of a
message
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Fault Tolerance
Circuit Switching
Packet Switching
Scalability
Scalability in Internet Architecture
Peers
Distributed
Hierarchical
QoS
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Mekanisme kontrol yang mampu
memberikan prioritas yang berbeda pada
aliran data/user yang berbeda, atau
menjamin kualitas aliran data sesuai
permintaan dari program aplikasi
QoS Example
Priority in QoS
Security
Network Security
 Ensure
confidentiality through use of
User authentication
 Data encryption
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 Maintain
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communication integrity through use of
Digital signatures
 Ensure
availability through use of
Firewalls
 Redundant network architecture
 Hardware without a single point of failure
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Element in Network
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Devices
 These
are used to
communicate with one
another
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Medium
 This
is how the devices
are connected together
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Messages
 Information
that travels
over the medium
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Rules
 Governs
how messages
flow across network
Network Devices
Devices in Network
Review Papers
 Network-based
application
(example :e-learning) or
 Internet 2
 You can find your own source of papers
 Put reference where appropriate
 Use proper references
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Primary Source
Secondary source: PhD thesis, journal paper, monograph,
book
You should not use Wikipedia