Introduction to Networking

1
Introduction to Networking

• Ref Hallberg, Chp 1-3 Deitel et al Chp 1

2
Overview

• Benefits of Networks
• Improvement Concerns
• Network Personnel
• Data Representation
• Data Transfer Speeds
• Network Relationships

• Network Features
• WANs
• OSI Model
• Network Hardware

3
Benefits of Networks

• Improved internal sharing of resources
• Enabling collaborative work
• Automation of production control
• Enhances timely communications
• Connection with suppliers and customers for
  supply chain management
• Provide value added services for customers
• Creates new business opportunities

4
Improvement Concerns

• WHAT does the BUSINESS need?
• Do network shortcomings inhibit achieving
  business goals?
• Could additional network capabilities benefit
  attaining business goals?
• Does the network need changes to support future
  business plans?
• What maintenance does the network need to
  maintain current levels of service?

5
Network Personnel

• Network administrators
• Systems programmers
• Network engineers
• Network architects and designers
• Help desk and technical support
• E-mail managers
• Web masters, designers, and programmers
• Database administrators

6
Questions

• Why should managers care about networking?
• Can you imagine the world without networks
  (e-mail, Web)?

7
Data Representation

• Encoding
• Number systems? xi yi, for i 0..n
• Decimal system
• Binary system
• Octal system
• Hexadecimal system

8
Data Transfer Speeds

• Speed in bits per sec, bps
• Related to cycles per second, Hz
• MHz approx Mbps
• Ethernet
• 10 Mbps
• 100 Mbps
• 1000 Mbps

9
Data, Memory Processing

• Main memory
• Address space
• Fetch/execute data has to be in main memory
• IRQ
• Interrupt request seeking cpus attention
• Number assigned to device for interrupt request
• DMA direct memory access

10
Network Relationships

• Peer-to-peer
• Client/server
• Multiuser

11
Network Features

• File server
• Print server
• Application server
• E-mail
• Web server
• Remote access
• Management services

12
Wide Area Network (WAN)

• Network connecting two or more geographically
  distinct LANs
• The Internet is an intricate and extensive WAN
  spanning the globe

13
OSI Model

• Provides network services to OS through network
  client s/w
• Data compression decompression encryption
  decryption
• Connection between client and server or peer
• Packet control, sequencing error correction
• Packet construction, transmission reception
• Bit stream connection protocol
• Network wiring and specifications
• Ref Sheet 8 of blueprints

14
Data Encapsulation
15
Communication Between Two Systems
16
IEEE Specifications
17
Hardware Common to AllServer-Based Networks

• Client
• Server
• Transmission media
• Network devices
• Routers
• Switches
• Hubs

18
Summary

• Networks used to accomplish business goals
• Need to maintain current system plan for future
• Network functions both applications and network
  management
• Encoded data transmitted between connected
  devices
• OSI seven layer model Plush Down NT SPA
• Common hardware client, server, media, network
  devices