Jaringan Komputer dan Komunikasi Data Semester Gasal 2014-2015
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Transcript of Jaringan Komputer dan Komunikasi Data Semester Gasal 2014-2015
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Chapter One
Introduction to Computer Networks and Data Communications
Data Communications and Computer Networks: A Business User's Approach
Sixth Edition
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Data Communications and Computer Networks: A Business User's Approach, Sixth Edition 2
After reading this chapter, you should be able to:
• Define the basic terminology of computer networks
• Recognize the individual components of the big picture of computer networks
• Outline the basic network layouts• Define the term “convergence” and describe how
it applies to computer networks• Cite the reasons for using a network architecture
and explain how they apply to current network systems
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After reading this chapter, you should be able to (continued):
• List the layers of the TCP/IP protocol suite and describe the duties of each layer
• List the layers of the OSI model and describe the duties of each layer
• Compare the TCP/IP protocol suite and the OSI model and list their differences and similarities
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Introduction
• Who today has not used a computer network?• Mass transit, interstate highways, 24-hour
bankers, grocery stores, cable television, cell phones, businesses and schools, and retail outlets support some form of computer network
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Data Communications and Computer Networks: A Business User's Approach, Sixth Edition 5
The Language of Computer Networks
• Computer network – an interconnection of computers and computing equipment using either wires or radio waves over small or large geographic areas
• Local area network – networks that are small in geographic size spanning a room, floor, building, or campus
• Metropolitan area network – networks that serve an area of 1 to 30 miles, approximately the size of a typical city
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Data Communications and Computer Networks: A Business User's Approach, Sixth Edition 6
The Language of Computer Networks (continued)
• Wide area network – a large network that encompasses parts of states, multiple states, countries, and the world
• Personal area network – a network of a few meters, between wireless devices such as PDAs, laptops, and similar devices
• Voice network – a network that transmits only telephone signals (almost extinct)
• Data network – a network that transmits voice and computer data (replacing voice networks)
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Data Communications and Computer Networks: A Business User's Approach, Sixth Edition 7
The Language of Computer Networks (continued)
• Data communications – the transfer of digital or analog data using digital or analog signals
• Telecommunications – the study of telephones and the systems that transmit telephone signals (becoming simply data communications)
• Network management – the design, installation, and support of a network, including its hardware and software
• Network cloud – a network (local or remote) that contains software, applications, and/or data
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Data Communications and Computer Networks: A Business User's Approach, Sixth Edition 8
The Big Picture of Networks
• Networks are composed of many devices, including:– Workstations (computers, tablets, wireless
phones, etc)– Servers– Network hubs and switches – Routers (LAN to WAN and WAN to WAN)– Telephone switching gear
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Data Communications and Computer Networks: A Business User's Approach, Sixth Edition 9
The Big Picture of Networks (continued)
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Communications Networks – Basic Layouts
• Microcomputer-to-local area network• Microcomputer-to-Internet• Local area network-to-local area network• Personal area network-to-workstation• Local area network-to-metropolitan area network
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Communications Networks – Basic Layouts (continued)
• Local area network-to-wide area network• Sensor-to-local area network• Satellite and microwave• Cell phones• Computer terminal / microcomputer-to-
mainframe
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Microcomputer-to-Local Area Network Layout
• Highly common throughout business and academic environments, and now homes
• Typically a medium- to high-speed connection• Computer (device) requires a NIC (network
interface card)• NIC connects to a hub-like device (switch)
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Microcomputer-to-Local Area Network Layout (continued)
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Microcomputer-to-Internet Layout
• Popular with home users and small businesses• For some, a dial-up modem is used to connect
user’s microcomputer to an Internet service provider
• Technologies such as DSL and cable modems are replacing modems
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Microcomputer-to-Internet Layout (continued)
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Local Area Network-to-Local Area Network Layout
• Found in systems that have two or more LANs and a need for them to intercommunicate
• A bridge-like device (such as a switch) is typically used to interconnect LANs
• Switch can filter frames
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Local Area Network-to-Local Area Network Layout (continued)
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Personal Area Network-to-Workstation Layout
• Interconnects wireless devices such as PDAs, laptops and notebooks, and music playback devices
• Used over short distances such as a few meters
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Personal Area Network-to-Workstation Layout (continued)
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Local Area Network-to-Metropolitan Area Network Layout
• Used to interconnect companies (usually their local area networks) to networks that encompass a city
• High-speed networks with redundant circuits• Metro Ethernet is latest form of metropolitan
LAN
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Local Area Network-to-Metropolitan Area Network Layout (continued)
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Local Area Network-to-Wide Area Network Layout
• One of the most common ways to interconnect a user on a LAN workstation to the Internet (a wide area network)
• A router is the typical device that performs LAN to WAN connections
• Routers are more complex devices than switches
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Local Area Network-to-Wide Area Network Layout (continued)
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Wide Area Network-to-Wide Area Network Layout
• High-speed routers and switches are used to connect one wide area network to another
• Thousands of wide area networks across North America, many interconnected via these routers and switches
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Sensor-to-Local Area Network Layout
• Not all local area networks deal with microcomputer workstations
• Often found in industrial and laboratory environments
• Assembly lines and robotic controls depend heavily on sensor-based local area networks
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Sensor-to-Local Area Network Layout (continued)
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Satellite and Microwave Layout
• Typically long distance wireless connections• Many types of applications including long
distance telephone, television, radio, long-haul data transfers, and wireless data services
• Typically expensive services but many companies offer competitive services and rates
• Newer shorter-distance services such as Wi-Max
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Satellite and Microwave Layout (continued)
Data Communications and Computer Networks: A Business User's Approach, Sixth Edition
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Cell Phone Layout
• Constantly expanding market across the U.S. and world
• Third generation services available in many areas and under many types of plans with fourth generation services starting to appear
• Latest generation includes higher speed data transfers (100s to 1000s of kilobits per second)
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Cell Phone Layout (continued)
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Cellular communication trends
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Information Revolution
Digitization: using the same tool (computers) to store, manipulate and transmit information in form of speech, text, data, and video more cheaply and faster than every before.
Networking: distributed, fast digital networks wired and wireless
Convergence: refers to merging of what were three separate industries: telecommunications, computing, and electronics or broadcasting
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Digital Communication
Where image text or sound is converted into binary numbers- ones and zeroes ( 0/1)
Digital codes can duplicate, track store or play back complex kinds of content
Strong when combined with ever greater chip capacity in computers, and bundles of glass fibre ( fibre optics) capable of carrying large quantities of information
Current “revolution”: the Digital Video DiskDVDs: higher resolution, no rewinding,now coming
recordable for storage and intending to replace CDSAlso: wireless Internet ( games on the cell phone)
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The Internet
Fixed Telecom.
Broadcasters
Cable TVOthers
Information Technologies
WirelessTechnologies
Convergence
Convergence
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Convergence
Service convergenceN-play services / N-play economicsExtends demand for broadband access
Market structure Strategic alliances (Content, Media, etc.)Mergers and acquisitions Consolidation
New business modelsFalling costs of traditional communicationMerger of customer baseLower margins / New value-added services… Costly investment programs
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Tele-Communication Sector in Transition
Migration to the IP-environment Fixed telecommunications
Incumbents: British Telecom, DT AG, KPN Newcomers: Dialog, Metropolitan Networks
Wireless communications Mobile telecommunications: from 2G to 4GWiFi, MiMax
Cable TVBroadcasting Service and content providers
Strengthened process of convergenceTechnologyMarketServicesInstitutional
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Telecom Industry (communication)
main framesdesk top computing
PC-LAN
PC-WANIntranet/Internet
electronicpublishing andentertainment
Computer Industry (computer)
Media Industry (content)
Wireline
mobility
Wireless/Cellular
PSTN
ISDN
PC/Servers
3G/Wireless Internet
Carrier class
xDSL
Trend of Telecom Convergence- Forces from computer and media industries
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Terminal/Microcomputer-to-Mainframe Computer Layout
• Predominant form in the 1960s and 1970s• Still used in many types of businesses for data
entry and data retrieval• Few dumb terminals left today – most are
microcomputers with terminal emulation card, a web browser and web interface, Telnet software, or a thin client
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Terminal/Microcomputer-to-Mainframe Computer Layout (continued)
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Network Architectures
• A reference model that describes the layers of hardware and software necessary to transmit data between two points or for multiple devices / applications to interoperate
• Reference models are necessary to increase likelihood that different components from different manufacturers will converse
• Two models to learn: TCP/IP protocol suite and OSI model
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The TCP/IP Protocol Suite
Note: Some authors show only four layers, combining the twobottom layers.
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The TCP/IP Protocol Suite (continued)
• Application layer – Where the application using the network resides– Common network applications include web browsing,
e-mail, file transfers, and remote logins• Transport layer
– Performs a series of miscellaneous functions (at the end-points of the connection) necessary for presenting the data package properly to the sender or receiver
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The TCP/IP Protocol Suite (continued)
• Network (Internet or internetwork or IP) layer– Responsible for creating, maintaining and ending network
connections– Transfers data packet from node to node (e.g. router to router)
within network
• Network access (data link) layer– Responsible for taking the data and transforming it into a frame
with header, control and address information, and error detection code, then transmitting it between the workstation and the network
• Physical layer– Handles the transmission of bits over a communications channel– Includes voltage levels, connectors, media choice, modulation
techniques
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The TCP/IP Protocol Suite (continued)
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The Open Systems Interconnection (OSI) Model
Note: The fifth layer (Physical) is missing in this figure.
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The Open Systems Interconnection (OSI) Model (continued)
• Application layer – Equivalent to TCP/IP’s application layer
• Presentation layer – Responsible for “final presentation” of data
(code conversions, compression, encryption)• Session layer
– Responsible for establishing “sessions” between users
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The Open Systems Interconnection (OSI) Model (continued)
• Transport layer – Equivalent to TCP/IP’s transport layer
• Network layer – Equivalent to TCP/IP’s network layer
• Data link layer – Responsible for taking the data and
transforming it into a frame with header, control and address information, and error detection code
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The Open Systems Interconnection (OSI) Model (continued)
• Physical layer – Handles the transmission of bits over a
communications channel– Includes voltage levels, connectors, media choice,
modulation techniques
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Logical and Physical Connections
• A logical connection is one that exists only in the software, while a physical connection is one that exists in the hardware
• Note that in a network architecture, only the lowest layer contains the physical connection, while all higher layers contain logical connections
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Logical and Physical Connections (continued)
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Logical and Physical Connections (continued)
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Network Layouts in Action
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The TCP/IP Protocol Suite in Action
• Note the flow of data from user to Web browser and back
• At each layer, information is either added or removed, depending on whether the data is leaving or arriving at a workstation
• The adding of information over pre-existing information is termed encapsulation
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The TCP/IP Protocol Suite in Action (continued)
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Download Bandwidth Ranking 2013 (1)
http://www.netindex.com/download/allcountries/
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Download Bandwidth Ranking 2013 (2)
2014: Indonesia rank no 141, BW 4.86 Mbps
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Data Communications and Computer Networks: A Business User's Approach, Sixth Edition 63
Summary
• Many services and products that we use every day employ computer networks and data communications in some way
• Field of data communications and computer networks includes data networks, voice networks, wireless networks, local area networks, metropolitan area networks, wide area networks, and personal area networks
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Data Communications and Computer Networks: A Business User's Approach, Sixth Edition 64
Summary (continued)
• Application areas can be understood in terms of general network layouts:– Microcomputer-to-local area network– Microcomputer-to-Internet– Local area network-to-local area network– Personal area network-to-workstation– Local area network-to-metropolitan area network– Local area network-to-wide area network– Wide area network-to-wide area network– Sensor-to-local area network– Satellite and microwave– Cell phone– Terminal/microcomputer-to-mainframe computer
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Data Communications and Computer Networks: A Business User's Approach, Sixth Edition 65
Summary (continued)
• Key concept in networking is convergence• A network architecture, or communications model, places
network pieces in layers– Layers define model for functions or services that need to
be performed
• The TCP/IP protocol suite is also known as the Internet model and is composed of five layers (some show four):– Application layer
– Transport layer
– Network layer
– Network access layer
– Physical layer
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Data Communications and Computer Networks: A Business User's Approach, Sixth Edition 66
Summary (continued)
• The International Organization for Standardization (ISO) created the Open Systems Interconnection (OSI) model– OSI model is based on seven layers: application layer,
presentation layer, session layer, transport layer, network layer, data link layer, physical layer
• A logical connection is a flow of ideas that occurs, without a direct physical connection, between the sender and receiver at a particular layer
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Lesson Plan
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1. Introduction
2. Fundamental of data and signal + quiz (@ 2.5%)
3. The Media + quiz
4. Making Connection + quiz
5. Multiplexing + quiz
6. Error Detection and Control + quiz
7. LAN: Basic + quiz
8. UTS (35%)
9. LAN: Software and support + quiz
10. WAN + quiz
11. Internet + quiz
12. Voice and Data Delivery network + quiz
13. Network Security + quiz
14. Network Design and Management + quiz
15. UAS (35%)
Data Communications and Computer Networks: A Business User's Approach, Sixth Edition 68