Tài liệu Chapter 1 - Living in a Network Centric World CCNA Exploration 4.0 pptx

Examples of Today’s Popular Communication Tools EM §FETNIIIWYWWN BACHKHOA NETWORKING ACADEMY e The existence and broad adoption of the Internet has ushered in new forms of communication

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Chapter 1 - Living in

a Network Centric World

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Overview

° 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

e Describe the characteristics of network architectures: fault tolerance, scalability, quality of service and security:

e Install and use IRC clients and a Wikiserver

Hoc vién mang Bach khoa - Website: www.bkacad.com

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Networks Supporting the Way We Live

information between connected computer system

graphics between many different types of devices

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/IÍIÍ(lllIlllIlllllIIllllIIIIIIlIIllIIIIIllIIIlII eae RTT The Global Community

The creation of online communities for the exchange of ideas and

information has the potential to increase productivity opportunities

across the globe

As the Internet connects people and promotes unfettered

communication, it presents the platform on which to run businesses, to address emergencies, to inform individuals, and to support education, science, and government

Play video to watch how the Internet, and its underlying technology, brings opportunities to people wherever they live or work

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° Data networks that were once the transport of information from business to business have been repurposed to

improve the quality of lite for people everywhere

The way we live is supported by services delivered by the data network

Học viện mạng Bách khoa - Website: www.bkacad.com

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Examples of Today’s Popular Communication Tools

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e The existence and broad adoption of the Internet has ushered in new forms of communication that empower individuals to create information that can be

accessed by a global audience such as:

— Instant Messaging podcasting

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Networks Supporting the Way We Learn

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Communication, collaboration, and engagement are fundamental building

blocks of education

e Robust and reliable networks support and enrich student learning experiences

° Courses delivered using network or Internet resources are often called online learning experiences, or e-learning

e Online courses can contain voice, data, and video, and are available to the

students at any time from any place

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Networks Supporting the Way We Learn

BACHKHOA NETWORKING ACADEMY

Online learning opportunities can decrease time-consuming and costly travel

yet still ensure that all employees are adequately trained to perform their jobs

in a safe and productive manner

Online courseware and delivery offer many benefits to businesses such as:

— Current and accurate training materials

— Availability of training to a wide audience

— Consistent quality of instruction,

— Cost reduction | — ==à>m>è>è 7

rare Welcome to “Introduction to Cisco

Personal Communications Assistant”

Example Course Page

Cisco Personal Communications Assistant (Cisco PCA) is the web application associated with Cisco Unity It is available whether you are in the office or connected over the virtual network (VPN) : In this lesson, you will learn

® how to log on to Cisco PCA

@ how to browse to Cisco Unity Assistant and Cisco Unity Inbox

@ about the functions available in Cisco Unity Assistant;

@ how to sel TRaP; and

® how to set record and playback devices Please click a topic from the menu on the right or click the

Next arrow to start

itw appre

to complete At the end of each simulation in this lesson, this lesson simply click the Next arrow to continue to the

next simulation, or choose a topic from the menu on the right

to Cisco Unity Inbar Exploring Ctsco Le Assists

Setting TRaP Satting record and

playback dewice

Summary

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Networks Supporting the Way We Work

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e The business networks evolved to enable the transmission of many different types of information services, including e-mail, video, messaging, and

telephony

e Today, networks provide a greater integration between related functions and organizations than was possible in the past

Business applications can be accessed remotely as if employees were on site

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Networks Supporting the Way We Play

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° Describe ways communication over a network supports the way we play

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The onboard data network provides a range

of services to airline personal seatback video systems

The way we play is supported by services delivered by the data network

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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 Among the protocols that govern successful human communication are:

An identified sender and receiver

Agreed upon method of communicating (face-to-face, telephone, letter,

photograph)

Common language and grammar

Speed and timing of delivery

Confirmation or acknowledgement requirements

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Quality of Communications

The external factors affecting communication are related to the complexity of the network and the number of devices a message must pass through on its route to its final destination

e External factors affecting the success of communication include:

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

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Quality of Communications

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Internal Factors

e Internal factors that interfere with network communication are related to the

nature of the message itself

° Internal factors affecting the successful communication across the network

include:

— The size of the message

— The complexity of the message

— The importance of the message

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Communicating over Networks

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e These data or information networks vary in size and capabilities, but all

networks have four basic elements in common:

— Rules or agreements to govern how the messages are sent, directed, received and interpreted

— The messages or units of information that travel from one device to another

— Ameans of interconnecting these devices - a medium that can transport the

messages from one device to another

— Devices on the network that exchange messages with each other

Communication across data networks plays a vital role in our daily life

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The Elements of a Network

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Message Network |

Medium Devices Four elements of a network:

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9000000000000 Wireless Media —— WAN Media

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Network Connections

Wired networks used

physical cables to connect

devices

Wireless networks use radio

waves to communicate between

devices

Wireless networks are also

connected to wired networks, at

some point Hoc vién mang Bach khoa - Website: www.bkacad.com

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Am FHLLlWU) BACHKHOA NETWORKING ACADEMY

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

World Wide Web (WWW) HTTP

(Hypertext Transport Protocol)

(Session Initiation Protocol)

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Converged Networks

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Multiple services-multiple networks

° Traditional telephone, radio, television, and computer data networks each have their own individual versions of the four basic network elements

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Converged Networks

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Converged networks

° Technology advances are enabling us to consolidate these disparate

networks onto one platform - a platform defined as a converged network

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Converged Networks

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° Intelligent Information Networks: The intelligent communications platform of tomorrow will offer so much more than basic connectivity and access to

applications

° Not only will voice and video be transmitted over the same network, the

devices that perform the telephone switching and video broadcasting will be the same devices that route the messages through the network

Intelligent Networks Are Bringing the World Together

» palm of your hand

os Log

The Human Network is everywhere he

Intelligent networks allow handheld devices to receive news and e-mails, and to send text

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The Network Architecture

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e Networks must support a wide range of applications and services, as well as operate over many different types of physical infrastructures

e Four basic characteristics that the underlying architectures need to address in order to meet user expectations: fault tolerance, scalability, quality of service, and security

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Quality of Service (QoS)

Quality | of Service managed by the router

ensures that priorities are matched with the

type of communication and its importance to

Streaming media will need

Boney to maintain a smooth,

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Administrators can protect the Internet

network with software and |

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A Fault Tolerant Network Architecture

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Circuit Switched Connection-oriented Networks

Circuit Switching in a Telephone Network

Many paths are

possible, but only hệ

one path is selected

per call elephone

Switch

elephone Switch elephone

>WitCh

even if no one is speaking

Telephone Network

There are many, many circuits, but a finite number During peak periods, some calls may be denied

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A Fault Tolerant Network Architecture

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Packet Switched Connectionless Networks

are routed to a destination

broken into packets Seas Destination [Sequence packets may be which are addressed and lÌ„ qdress „ am nuniber reassembled into order numbered according to their

sequence number

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A Scalable Network Architecture

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e The fact that the Internet is able to expand at the rate that it is, without

seriously impacting the performance experienced by individual users, is a

function of the design of the protocols and underlying technologies on which it

Examples are: Verizon,

Sprint, AT&T, NTT, cable

systems and wide area

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Internet Structure - A Network of Networks

“Tier-2” ISPs are smaller and often provide regional service Tier-2 ISPs usually pay Tier-1 ISPs for connectivity to

rest of the Internet

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WT BACHKHOA NETWORKING ACADEMY

“Tier-3” ISPs are the local providers of service directly to end users Tier-3 ISPs are usually connected to Tier 2

ISPs and pay Tier 2 providers for Internet access

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The Domain Name System (DNS) provides a hierarchical directory of addresses one server doesn’t have to hold

the entire list of millions of addresses

The DNS servers update each with the top level

addressses so local devices can search the closest

one confident that the information is up-to-date

| The DNS servers contain lower level addresses only

for the networks directly connected This keeps the directories from getting too large

Hierarchical Distributed Peers

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The distributed nature of connections and directories means that communication can bypass bottlenecks and

outages Originally designed to protect against military attack, the system has also proved the best way to offer a

scalable, reliable civilian network

communication is automatically directed

“ along another route

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WT BACHKHOA NETWORKING ACADEMY

Internet Structure - A Network of Networks Peer connections between networks at the same level provide direct connections, bypassing longer routes and

preventing congestion on the backbone

Tier-1 ISP Tier-1 ISP Tier-2 ISP

Tier 1 Tier 2 Tier 3 Hierarchical Distributed Peers

Tiêu đề	Living in a Network Centric World
Trường học	Học viện mạng Bách khoa
Chuyên ngành	Networking
Thể loại	Lecture notes
Năm xuất bản	Unknown
Thành phố	Unknown

Định dạng
Số trang	41
Dung lượng	1,56 MB