Transcript 3620 2016 5 Networks

Identify trends in telecommunication networks.
Identify basic components, functions and types of networks.
Examine network management issues.
Telecommunications: The exchange of information over
networks
Why?
• Share data - Between computers: Email, file-sharing, backup
• Share peripheral devices – Printers, storage
 Local (LAN)
 Wide Area Networks (WAN)
 Internet
Mainframe
Laptop Server
Communications
Services
Local
Manager
WAN
Communications
Products
Work Station
Server
POS
Clients
Networked Workgroups
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Internet
Provider
(ISP)
Wireless Access Point
Firewall
Router
Switch
Hub
Hub
Switch
Clients
Repeater
Network Interface Card (NIC)
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Twisted Pair - similar to phone wire
Fiber Optics
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glass/plastic fiber
using light
greater bandwidth
lower attenuation - greater
repeater spacing
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Satellite – microwave signals
◦ HEO - 22,000 mi. up, LEO - 500 mi. up
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Cellular – radio signals to cell towers
Wireless – IEEE 802.11b,a,g,n,…
◦ Speeds to 54 Mbps or more
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Bluetooth
Microwave – line of sight
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Don’t need cabling
Good for
◦ mobility
◦ historical buildings
◦ manufacturing
environments
◦ real time inventory
◦ hand held devices
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Lower speeds
Higher cost
Security?
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Some computers are servers – usually more
powerful, expensive,…
Single point of failure – server is down…
Need administrator, account management,…
Purpose: Email, Database, File, Print,
Application, Web servers,…
The rest are clients
can be smaller and/or slower
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Star - using hubs/switches
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Manage user accounts
Manage performance
Assigning priorities
Detecting and correcting errors
Installing cables, wireless access points
Traffic, security, capacity planning,…
Often responsible for hardware including
routers, switches, firewalls…maybe even
servers and storage
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• Security Administration
• User/Group Administration
• Network Configuration
• System Config.
• Backup & Restore
• Media Control & Storage
• Data Management
• Data Collection
•Remote Store Mgmt.
Data
Management
Administration
Integrated
Control
Planning &
Scheduling
• Workload Scheduling
• Performance Monitoring
• Performance Analysis
• Capacity Planning
Asset
Management
Problem
Management
• Software Licensing
• Distribution & Control
• Employee Profile
• Resource Accounting
• Charge back Services
• Inventory Control
• Fault Reporting
• Problem Escalation
• Resolution Assessment
• Help Desk Facilities
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ISP - Internet Service Provider
A company that provides access to the Internet
For a monthly fee you get internet access
ISPs are connected to one another
http://www.highspeedinternet.com/wa/seattle?z
ip=98119
◦ Speed http://speedtest.comcast.net/
◦ Net neutrality issue…
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VoIP - Voice over IP
◦ Using an Internet connection to pass voice data
(telephone calls) using the internet
◦ E.g., Skype, …
◦ http://www.voip-info.org/
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networks are easy to tap into - many entry
points
lots of wires spread throughout
wireless all over…
organizations sharing the same network, e.g.,
airport
use of automated passwords to logon to
different systems
access to a computer  access to the
network
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Wireless, mobile
Cloud Computing
GPS - Location based
IoT – Internet of Things
Everything connected?
Always connected?
Net neutrality
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… Information overload!?
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Geographic barriers – non digital part?
Time barriers – personal part?
Cost barriers – eliminate air travel?
Structural barriers – relationships?
Public wireless access points
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