CCNA

1. © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
ITE PC v4.0
Chapter 1 1
Living in a Network
Centric World
Network Fundamentals – Chapter 1

2. ITE PC v4.0
Chapter 1 2
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Objectives
 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.
 Identify the opportunities and challenges posed by
converged networks.
 Describe the characteristics of network architectures:
fault tolerance, scalability, quality of service and
security.
 Install and use IRC clients and a Wiki server.

3. ITE PC v4.0
Chapter 1 3
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
How Networks Impact Daily Life

4. ITE PC v4.0
Chapter 1 4
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
How Networks Impact Daily Life
–Instant messaging
•Real time communication
between 2 or more
people based on typed text
–Weblogs (Blogs)
•Web pages created
by an individual
–Podcasting
•Website that contains
audio files available
for downloading

5. ITE PC v4.0
Chapter 1 5
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
How Networks Impact Daily Life

6. ITE PC v4.0
Chapter 1 6
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
How Networks Impact Daily Life

7. ITE PC v4.0
Chapter 1 7
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Data Networking Role, Components, and
Challenges
 Role of data networking in communications

8. ITE PC v4.0
Chapter 1 8
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Data Networking Role, Components, and
Challenges
 Describe the various
elements that make up a
network
–Devices
•These are used to
communicate with one
another
–Medium
•This is how the devices
are connected together
–Messages
•Information that travels
over the medium
–Rules
•Governs how messages
flow across network

9. ITE PC v4.0
Chapter 1 9
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Data Networking Role, Components, and
Challenges
 Describe the role of converged networks in
communications
–Converged network
• A type of network that can carry voice, video & data over
the same network

10. ITE PC v4.0
Chapter 1 10
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Network Architecture Characteristics
 The main four characteristics that are addressed by
network architecture design
–Fault tolerance
–Scalability
–Quality of service
–Security

11. ITE PC v4.0
Chapter 1 11
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Network Architecture Characteristics
 This is how packet switching helps improve the
resiliency and fault tolerance of the Internet architecture

12. ITE PC v4.0
Chapter 1 12
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Network Architecture Characteristics
 Explain the factors that necessitate Quality of Service
and the mechanisms necessary to ensure it

13. ITE PC v4.0
Chapter 1 13
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Network Architecture Characteristics
 Describe how QoS mechanisms work to ensure quality
of service for applications that require it.

14. ITE PC v4.0
Chapter 1 14
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Network Architecture Characteristics
 Why networks must be secure?

15. ITE PC v4.0
Chapter 1 15
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Network Architecture Characteristics
 Describe basic measures to secure data networks
–Ensure confidentiality through use of
•User authentication
•Data encryption
–Maintain communication integrity through use of
•Digital signatures
–Ensure availability through use of
•Firewalls
•Redundant network
architecture
•Hardware without a single
point of failure

16. ITE PC v4.0
Chapter 1 16
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
IRC Clients and Wiki Server
 Install and use IRC clients and a Wiki server

17. ITE PC v4.0
Chapter 1 17
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Summary

18. ITE PC v4.0
Chapter 1 18
© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public