CA_Ex_S1M01_Living in a Network-Centric World

Chapter 1-Living in a Network Centric World

CCNA Exploration 4.0

Objectives

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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. Học viện mạng Bach Khoa - Website: www.bkacad.com

Communication in a Network-Centric World

Học viện mạng Bach Khoa - Website: www.bkacad.com

How Networks Impact Daily Life 1.1.1.1

• 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, and graphics between many different types of devices. Học viện mạng Bach Khoa - Website: www.bkacad.com

How Networks Impact Daily Life The way we live


Lab 1.1.1.4 •

http://googleearthonline.blogspot.com/


How Networks Impact Daily Life


Extra: Wikipedia


Extra: RSS

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A podcast is a digital media file, or a related collection of such files, which is distributed over the Internet using syndication feeds for playback on portable media players and personal computers. A web feed is a data format used for providing users with frequently updated content. Content distributors syndicate a web feed, thereby allowing users to subscribe to it. Making a collection of web feeds accessible in one spot is known as aggregation, which is performed by an Internet aggregator. A web feed is also sometimes referred to as a syndicated feed. RSS (Really Simple Syndication) is an XML-based vocabulary that specifies a means of describing news or other Web content that is available for "feeding" (distribution or syndication) from an online publisher to Web users. Học viện mạng Bach Khoa - Website: www.bkacad.com


The way we learn • Communication, collaboration, and engagement are fundamental building blocks of education. The learning materials include interactive activities, assessments, and feedback. • Traditional learning methods: student can obtain information only from the textbook and the instructor. • E-learning courseware: contain voice, data, and video; any time, anywhere; online discussion. Combine instructor-led classes with online courseware. • Access to high quality instruction. • Removed geographic barriers Học viện mạng Bach Khoa - Website: www.bkacad.com


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The Cisco Networking Academy Program is an example of a global online learning experience. 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. Học viện mạng Bach Khoa - Website: www.bkacad.com






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. Học viện mạng Bach Khoa - Website: www.bkacad.com


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. Học viện mạng Bach Khoa - Website: www.bkacad.com

How Networks Impact Daily Life The way we play • Supported by services delivered by the data network




Communication – An essential Part of Our Lives


Communication

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Basic characteristics of communication: 1. Rules or agreements are 1st established 2. Important information may need to be repeated 3. Various modes of communication may impact the effectiveness of getting the message across. Học viện mạng Bach Khoa - Website: www.bkacad.com

Quality of Communications 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 readressed • The number of other messages being transmitted simultaneously on the communication network • The amount of time allotted for successful communication Học viện mạng Bach Khoa - Website: www.bkacad.com

Quality of Communications

Internal Factors • The size of the message • The complexity of the message • The importance of the message








The Network as a Platform


Data Networking Role


Data Networking Components

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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 Học viện mạng Bach Khoa - Website: www.bkacad.com

The Elements of a Network


The Elements of a Network Network Connections


The Elements of a Network •

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


Sending an Instant Message: Example


Converged Networks •

Multiple servicesmultiple networks

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Converged networks


Converged Networks • •

Intelligent Information Networks: offer so much more than basic connectivity and access to applications. Planning for the Future


The Architecture of the Internet


Network Architecture Characteristics

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Network architecture: refers to both the technologies that support the infrastructure and the programmed services and protocols that move the messages across that infrastructure. 4 basic characteristics that the underlying architectures need to address in order to meet user expectations:

1. 2. 3. 4.

fault tolerance scalability quality of service security Học viện mạng Bach Khoa - Website: www.bkacad.com

Four Characteristics


Fault Tolerant Network Architecture •

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

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Circuit switched Connection-oriented Network


Fault Tolerant Network Architecture •

Packet Switched Connectionless Networks


Scalable Network Architecture • The Internet: is able to expand, has a hierarchical layered structure for addressing, for naming and for connectivity services. Maintain peering relationships with other at the same level.


Quality of service


Quality of service • •

Quality of Service (QoS): to prioritize which types of data packets must be delivered at the expense of other types of packets that can be delayed or dropped. 2 steps: – Classification – Assigning priorities


Quality of service •

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


Network Security

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The network infrastructure, services, and the data are crucial personal and business assets. Compromising the integrity of these assets could have serious business and financial repercussions. Consequences of a network security breach could include: – Network outage that prevents communications and transactions occurring, with consequent 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 Học viện mạng Bach Khoa - Website: www.bkacad.com

Network Security


Network Security •

Ensure confidentiality: – User authentication – Data encryption

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Maintain communication integrity: – Digital signatures

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Ensure availability: – Firewalls – Redundant network architecture – Hardware without a single point of failure Học viện mạng Bach Khoa - Website: www.bkacad.com

Lab


Trends in Networking


Trends in Networking •

There are three major trends that are contributing to the future shape of complex information networks: – Increasing number of mobile users – Proliferation of network capable devices – Expanding range of services


Networking Career Opportunities • Information Technology and networking careers are growing and

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evolving as fast as the underlying technologies and services. As networks increase in sophistication, the demand for people with networking skills will continue to grow. Traditional IT positions like programmers, software engineers, data base administrators and network technicians are now joined by new titles, 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 medical equipment design, now require a significant amount of knowledge about network operation in order to be successful. Chief Technology Officers in many large organizations list the lack of qualified personnel as the primary factor delaying the implementation of innovative new services.


Using the curriculum


Using the curriculum


Using the PKT


Assessment


Summary



CA_Ex_S1M01_Living in a Network-Centric World

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