netcomm chapter 01
TRANSCRIPT
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Business Data Communications,
Stallings
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Introduction
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Information & Communication
Networking is critical to the new corporate
structures emerging in todays businesses Benefits of good networks
make geographically dispersed companies moremanageable
help top-heavy companies trim down middlemanagement
help companies break down barriers betweendivisions.
make automation and quality enforcementeasier to implement.
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Basic Communications Model
Source
Generates data to be transmitted Transmitter
Converts data into transmittable signals
Transmission System Carries data
Receiver
Converts received signal into data
Destination
Takes incoming data
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Basic Communications Model
Example
Communication between a workstation and aserver
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Trends Driving Data Communication
Traffic growth
Voice & data over Internet Protocol (IP); localand long distance
Development of new services
Multimedia on demand and TV distribution
Advances in technology
Encourage and support increased growth andnew developments
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Key Technology Trends Faster and cheaper computing platforms,
communications hardware, and software Increasingly intelligent networks,
management and assessment tools
Growing importance of Internet, intranetand extranet applications
Increasing use of and dependence onmobile and wireless technology
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Enterprise Networks Drivers
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Enterprise Networks Convergence
A Three-Layer Model
Applications: Seen by end users Voice calling, email, and instant messaging
Group collaboration and relationshipmanagement
Enterprise Services: Seen by network
Manager Design, maintenance, and support services Authentication, capacity management, and QoS
Infrastructure: Enterprise available assets
Links, LANs, WANs, and Internet connections Carry information over data networks
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Unified Communication (UC)
Convergence
Web 2.0: Second generation web capabilities
User generated content (blogs, wikis, clips, etc.)
Desktoplike user interface friendly capabilities
Real-Time Communication (RTC): desktop andmobile software clients functionalities
IP Enabling Contact Centers: Enhance customercontact center functionality and performance
IP Mobility: Remote access technology and mobileemployees support
IP Wireless: IP packet extended to support localand wide area wireless communication
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Unified Communication (UC)
Convergence
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Unified Communication Does not only integrates communication
channels
Also integrates commnication functionsdirectly into business application Three levels of integration
Personal unified communication PDAs, IMs
Workgroup unified communication Supports collaborative efforts
Enterprise unified communication Integrates communications with enterprise-wide anddepartmental-level applications, business processesand workflows
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Business Information
Requirements Personal, Workgroup, and Enterprise
Unified Integrated Communications:
Voice communications
Data communications
Image communications Video communications
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The Internet and
Distributed Applications Internet: a key infrastructure for
supporting distributed applications
TCP/IP: standard open architecture protocolsuite universally used in data networks
Distributed Applications: used inintercompany and intra-companyinformation exchange
Client-Server & Intranets: easy to
implement approach to most businessapplications
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Simplified Network Model
WANWAN
LANLAN
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Networking Configuration
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Business Data Communications,
Stallings
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Transmission of Information Transmission
converts data into transmittable signals
Transmission Media
twisted pair, fiber, wireless, and coax
Communication Techniques
encoding, interface, protocols
Transmission efficiency
multiplexing, compression
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Management Issues Network Security
Confidentiality
Integrity
Availability
Network Management
Highly distributed peer-to-peer networks
Complexity of managing and maintaining
Reliable operation at all times
Skilled personnel and communication costs
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Communications Standards Importancepetition leads to lower cost
Enovation through open standards
Organizations
Internet Society (ISOC), InternationalOrganization for Standardization (ISO), the IEEE
802 LAN/MAN Committee, the internationalTelecommunication Union (ITU), and theNational Institute of Standards and Technology(NIST),