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Living in a Network Centric World. Network Fundamentals – Chapter 1. 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. - PowerPoint PPT Presentation
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© 2007 Cisco Systems, Inc. All rights reserved. Cisco PublicITE PC v4.0Chapter 1 1
Living in a Network Centric World
Network Fundamentals – Chapter 1
ITE PC v4.0Chapter 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.
ITE PC v4.0Chapter 1 3© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Requirements for Internet Connection
The Internet is the largest data network on earth.
IT consists of many large and small networks that are interconnected.
Individual computers are the sources and destinations of information through the Internet.
Connection to the Internet can be broken down into
the Physical connection,
the logical connection,
and applications.
ITE PC v4.0Chapter 1 4© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
How Networks Impact Daily Life Explain the benefits of instantaneous communication
and how it supports and improves our lives.
ITE PC v4.0Chapter 1 5© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
How Networks Impact Daily Life Describe the characteristics and purpose of popular
communication media such as, IM, Wikis , Blogs, Podcasting, and Collaboration Tools
–Instant messaging•Real time communication
between 2 or more people based on typed text
–Weblogs (Blogs)•Web pages created
by an individual, give anyone a means to communicate their tho-ughts to a global audience without technical knowledge of web design
–Podcasting•Website that contains
audio files available for downloading
ITE PC v4.0Chapter 1 6© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
How Networks Impact Daily Life Explain ways that using information networks to share
and collaborate improves teaching and learning
ITE PC v4.0Chapter 1 7© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
How Networks Impact Daily Life Describe ways communication over a network changes
the way we work
ITE PC v4.0Chapter 1 8© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
How Networks Impact Daily Life Describe ways communication over a network supports
the way we play
ITE PC v4.0Chapter 1 9© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Data Networking Role, Components, and Challenges Basic characteristics of communication Communication in our daily lives takes many forms and occurs in many environments. We
have different expectations depending on whether we are chatting via the Internet or participating in a job interview. Each situation has its corresponding expected behaviors and styles.
–Rules or agreements are 1st established
–Important information may need to be repeated
–Various modes of communication may impact the effectiveness of getting the message across.
ITE PC v4.0Chapter 1 10© 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
ITE PC v4.0Chapter 1 11© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Data Networking Role, Components, and Challenges Describe the role of converged networks in
communications( Intelligent Information network)–Converged network
• A type of network that can carry voice, video & data over the same network
ITE PC v4.0Chapter 1 12© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Network Architecture Characteristics Explain four characteristics that are addressed by
network architecture design–Fault tolerance
–Scalability
–Quality of service
–Security
ITE PC v4.0Chapter 1 13© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Network Architecture Characteristics Describe how packet switching helps improve the
resiliency and fault tolerance of the Internet architecture
ITE PC v4.0Chapter 1 14© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Network Architecture Characteristics Describe characteristics of the Internet that help it scale
to meet user demand–Hierarchical
–Common standards or protocols
ITE PC v4.0Chapter 1 15© 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
ITE PC v4.0Chapter 1 16© 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.
ITE PC v4.0Chapter 1 17© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Network Architecture Characteristics Describe how to select the appropriate QoS strategy for
a given type of traffic
Time-sensitive communication
Non time-sensitive communication
High importance to organization
Undesirable communication
ITE PC v4.0Chapter 1 18© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Network Architecture Characteristics Describe why networks must be secure
ITE PC v4.0Chapter 1 19© 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
ITE PC v4.0Chapter 1 20© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
IRC and IM
When people want an immediate response they use telephone instead of email. But telephone can not be used for data transfer. So IRC (Internet Relay Chat) and IM (Instant Messaging) fits nice to these requirements. e.g AOL, MSN, Yahoo, ICQ, AIM.
AIM and ICQ use proprietary Open System for Communication in Realtime (OSCAR) protocol.
Both Microsoft and Yahoo use propriety
IETF formalized an open standard , Jabber, based on the Extensible Messaging and Presence Protocol (EMPP).
ITE PC v4.0Chapter 1 21© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public
Summary
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 tlerance, scalability, quality of service and security
ITE PC v4.0Chapter 1 22© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public