Date post: | 14-Dec-2015 |
Category: |
Documents |
Upload: | eustace-pope |
View: | 221 times |
Download: | 0 times |
1
CHAPTER 4Telecommunications
and Networking
2
1. What Is a Computer Network?2. Network Fundamentals3. The Internet and the World Wide
Web4. Network Applications
3
>>>1. Compare and contrast the major types of
networks.
2. Describe the wireline communications media and transmission technologies.
3. Describe the most common methods for accessing the Internet.
4. Explain the impact that networks have had on business and everyday life for each of the six major categories of network applications.
4
OPENING >• Get Rid of E-Mail?
Seriously?
Is it feasible for your university to eliminate e-mail? Why or why not? Would you support such a policy at your school? Why or why not?
Describe the advantages and disadvantages of eliminating e-mail from an organization. Provide specific examples to support your answers.
5
What Is a Computer Network?
4.1
• Computer Network• Bandwidth
Broadband
• Local Area Networks (LAN)• Wide Area Networks (WAN)
Metropolitan area networks (MAN)
• Enterprise Networks
6
Basic Concepts
• Computer networks:ConnectTransmitShare work
• Bandwidth: transmission capacityBps, Kbps, Mbps
• LAN: limited geo area
7
Figure 4.1: Ethernet Local Area Network (LAN)
One thing missing
8
Figure 4.2: Enterprise Network
9
Network components
• Clients• Server
Network operating systems (NOS)
• Media• Communications processors
SwitchRouter
• Protocol
• Logical “flow” of the above
10
Network Fundamentals
4.2
• Analog and Digital Signals• Modem• Communications Media and
Channels• Network Protocols• Types of Network Processing
11
Figure 4.3: Analog and Digital Signals
12
Modem
13
Communications Media and Channels
• Twisted-Pair Wire• Coaxial Cable• Fiber Optics
14
Communications Media: Twisted-Pair Wire
15
Communications Media: Coaxial Cable
16
Communications Media: Fiber Optics
17
Table 4.1: Advantages and Disadvantages of Wireline Communications Channels
18
Network Protocols
• A common set of rules and proceduresDefines _____ (things)Specifies _________ (ways)Handles _______________ (situations)Facilitates and assures _________ (obj)
• Ethernet• Transmission Control Protocol /
Internet Protocol (TCP/IP)
19
Transmission Control Protocol / Internet Protocol
• Three Basic Functions of TCP• Packets & Packet Switching• Four Layers of the TCP/IP Reference
Model
20
Figure 4.8: Packet Switching
21
Three Basic Functions of the TCP
1. Manages the movement of data packets between computers by establishing a connection between the computers
2. Sequences the transfer of packets3. Acknowledges the packets that have
been transmitted
22
Four Layers of the TCP/IP Reference Model
1. Application Layer2. Transport Layer3. Internet Layer4. Network Interface Layer
23
Figure 4.7: The Four Layers of TCP/IP Reference Model
24
Types of Network Processing
• Distributed Processing• Client/Server Computing• Peer-to-Peer Processing
25
’S ABOUT BUSINESS 4.1
• Internet Access in Cuba
Describe the advantages and disadvantages of the global Internet to Cuban citizens.
Describe the advantages and disadvantages of the global Internet to the Cuban government.
26
The Internet and the World Wide Web
4.3
• Internet versus WWW• Accessing the Internet• The Future of the Internet• The World Wide Web
27
Figure 4.9: Internet (backbone in white)
40 maps that explain the internet
28
The World Wide Web (WWW)
• World Wide Web• Internet• Intranet• Extranet
29
Accessing the Internet
• Connecting via an Online ServiceISP; NAP
• Connecting via Other MeansInternet kiosksSmart phones and iPadsCybercafes
• Addresses on the Internet
30
Table 4.2: Internet Connection Methods
31
Future of the Internet
Experts are concerned that Internet users will experience brownouts from 3 factors:1. increasing number of people working
online2. Popularity of Web sites such as YouTube
requiring large amounts of bandwidth3. Demand for high-definition television
delivered over the Internet
Domain name system (DNS)(AKA: Domain name service)
Some country domains that are commonly seen: .au, .ca, .cn, .fr, .hk, .jp, .kr, .mx, .ru, .sg, .tv(!), .tw, .ua, .uk,
Domain name system (DNS) – Converts IP addresses into domains: www.csun.edu = 130.166.238.195
33
Network Applications4.4
• Discovery• Communication• Collaboration • E-learning and Distance
EducationVirtual Universities
• Telecommuniting
34
Network Applications: Discovery
• Search Engines and Metasearch Engines
• Publication of Material in Foreign Languages
• Portals
35
Publication of Materials in Foreign Languages
36
’S ABOUT BUSINESS 4.2
• Just Exactly What Is Quara? Is Quora a search engine, a knowledge-
management system, or both? Provide specific examples to support your answer.
Is there an inherent problem with Quora itself selecting experts to whom the site sends questions? Support your answer.
37
Network Applications: Portals
• Commercial portal• Affinity portal• Corporate portal• Industrywide portal
38
Affinity Portals
39
Network Applications: Communication
• Electronic Mail• Web-Based Call Centers• Electronic Chat Rooms• Voice Communication
Voice Over Internet Protocol (VoIP)
• Unified Communications• Collaboration• Electronic Teleconferencing
40
Telecommunication: Teleconferencing/Telepresence
41
Network Applications: Collaboration (PP. 122-125)
• Workgroup• Workflow• Virtual Team• Virtual Collaboration• Crowdsourcing• Synchronous versus Asynchronous• Collaboration Tools
42
Collaboration Tools
• Microsoft Sharepoint• Google Drive• IBM Lotus Quikr• Jive
43
Network Applications: E-Learning versus Distance Education
• E-Learning• Distance Education
44
Virtual Universities
• University of Phoenix• California Virtual Campus• University of Maryland
45
Network Applications:
Telecommuting
• Knowledge workers• Digital Nomads