ca_ex_s1m01_living in a network-centric world

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Chapter 1-Living in a Network Centric World

CCNA Exploration 4.0


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Hc vin mng Bach Khoa - Website: www.bkacad.com

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 networkarchitectures: fault- tolerance, scalability, quality ofservice and security.

Install and use IRC clients and a Wiki server.


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Communication in a

Network-Centric World


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How Networks Impact Daily Life

Communication is almost as important to us as our reliance on air,water, food, and shelter.

The communication method changes and evolves constantly. Early data network: limited to exchanging character-based information

between connected computer systems.

Current networks have evolved to carry voice, video streams, text, andgraphics between many different types of devices.

1.1.1.1


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The way we live


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Lab 1.1.1.4

http://googleearthonline.blogspot.com/


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Extra: Wikipedia


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Extra: RSS

A podcast is a digital media file, or a related collection of such files, which is distributedover the Internet using syndication feeds for playback on portable media players andpersonal computers.

A web feed is a data format used for providing users with frequently updated content.Content distributors syndicatea web feed, thereby allowing users to subscribeto it.Making a collection of web feeds accessible in one spot is known as aggregation, whichis performed by an Internet aggregator. A web feed is also sometimes referred to as asyndicated feed.

RSS (Really Simple Syndication) is an XML-based vocabulary that specifies a meansof describing news or other Web content that is available for "feeding" (distribution orsyndication) from an online publisher to Web users.


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The way we learn

Communication, collaboration, and engagement are fundamental building blocks ofeducation. The learning materials include interactive activities, assessments, andfeedback.

Traditional learning methods: student can obtain information only from the textbook andthe instructor.

E-learning courseware: contain voice, data, and video; any time, anywhere; onlinediscussion. Combine instructor-led classes with online courseware.

Access to high quality instruction. Removed geographic barriers


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The Cisco Networking Academy Program is an example of a global online learningexperience.

Online courseware and delivery offer many benefits:1. Current and accurate training materials.2. Availability of training to a wide audience.

3. Consistent quality of instruction.4. Cost reduction.


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The way we work

Many different types of information services: e-mail, video, messaging,and telephony.

Intranets for private, extranets for suppliers, vendors, and customers.


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The way we work

Many different types of information services: e-mail, video, messaging,and telephony.

Intranets for private, extranets for suppliers, vendors, and customers.


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The way we play

Supported by services delivered by the data network


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Communication

An essential Part of Our Lives


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Communication

Basic characteristics of communication:

1. Rules or agreements are 1st

established2. Important information may need to be repeated3. Various modes of communication may impact

the effectiveness of getting the message

across.


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Quality of Communications

External Factors

The quality of the pathway between the senderand the recipient

The number of times the message has to changeform

The number of times the message has to beredirected or readressed

The number of other messages being transmitted

simultaneously on the communication network

The amount of time allotted for successful

communication


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Internal Factors

The size of the message The complexity of the message

The importance of the message


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The Network as a Platform


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Data Networking Role


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Data Networking Components

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


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The Elements of a Network


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Network Connections


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Protocols are the rules that the networked devices use tocommunicate with each other.


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Sending an Instant Message: Example


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Converged Networks

Multiple services-multiple networks

Converged networks


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Converged Networks

Intelligent Information Networks: offer so much more than basicconnectivity and access to applications.

Planning for the Future


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The Architecture of the Internet


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Network Architecture Characteristics

Network architecture: refers to both the technologies that support theinfrastructure and the programmed services and protocols that movethe messages across that infrastructure.

4 basic characteristics that the underlying architectures need to address

in order to meet user expectations:1. fault tolerance2. scalability3. quality of service

4. security


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Four Characteristics

F l T l N k A hi


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Fault Tolerant Network Architecture

DoD (the United States Department of Defense): research a communicationsmedium that could withstand the destruction of numerous sites andtransmission facilities without disruption of service fault tolerance.

Circuit switched Connection-oriented Network

F lt T l t N t k A hit t


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Fault Tolerant Network Architecture

Packet Switched Connectionless Networks

S l bl N t k A hit t


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Scalable Network Architecture

The Internet: is able to expand, has a hierarchical layered structure foraddressing, for naming and for connectivity services. Maintain peeringrelationships with other at the same level.

Q lit f i


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Quality of service

Quality of service


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Quality of service

Quality of Service (QoS): to prioritize which types of data packets must be delivered atthe expense of other types of packets that can be delayed or dropped.

2 steps: Classification

Assigning priorities

Quality of service


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Quality of service

Examples of priority decisions: time-sensitive; non time-sensitive; high importance; undesirable communication.

Network Security


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Network Security

The network infrastructure, services, and the data are crucial personal and businessassets.

Compromising the integrity of these assets could have serious business and financialrepercussions.

Consequences of a network security breach could include:

Network outage that prevents communications and transactions occurring, withconsequent loss of business Misdirection and loss of personal or business funds Company intellectual property (research ideas, patents or designs) that is stolen and

used by a competitor Customer contract details that become known to competitors or made public,

resulting in a loss of market confidence in the business

Network Security


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Network Security

Network Security


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Network Security

Ensure confidentiality:User authentication

Data encryption Maintain communication integrity:

Digital signatures

Ensure availability:Firewalls

Redundant networkarchitecture

Hardware without asingle point of failure

Lab


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Lab


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Trends in Networking



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Increasing

number of mobileusers

Proliferation ofnetwork capable

devicesExpanding range

of services

There are three major trends that are contributing to thefuture shape of complex information networks:

Networking Career Opportunities


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Networking Career Opportunities

Information Technology and networking careers are growing andevolving as fast as the underlying technologies and services. Asnetworks increase in sophistication, the demand for people withnetworking skills will continue to grow.

Traditional IT positions like programmers, software engineers, database administrators and network technicians are now joined by newtitles, such as network architect, e-Commerce site designer,information security officer, and home integration specialist.

Opportunities for forward thinking entrepreneurs are unlimited.

Even non-IT jobs, like manufacturing management or medicalequipment design, now require a significant amount of knowledgeabout network operation in order to be successful.

Chief Technology Officers in many large organizations list the lack ofqualified personnel as the primary factor delaying the implementationof innovative new services.

Using the curriculum


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Using the PKT


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Using the PKT

Assessment


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Summary


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y


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