Download Network Information

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Information Systems Management
Gerhard Steinke
Networks
BUS 6170
Spring 2014
Gerhard Steinke
We Live in a Networked
World…
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Laptop
Mainframe
Server
Communications
Services
WAN
Local
Manager
Communications
Products
Work Station
Server
Clients
Networked Workgroups
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POS
Telecommunication Trends
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Use of Internet/WWW
Faster communication speeds
Wireless
GPS
Interoperability, new services and applications
Global connectivity, collaboration
Single source for voice, images, video, and data
Electronic commerce
Intranet, extranet, web-enabled
And thus… Information overload!
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Telecommunications
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 Definition: The exchange of information in any form over
computer-based networks
 Why Telecommunication networks?
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Share data
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Between computers, email, file-sharing
Between a computer and a server, remote databases
Share peripheral devices
Printers, Scanners, Fax
 Types:
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LAN/WAN local area network – Wide area network
Internet Intranets- Boeing internal
Extranets – Companies allow other companies within networks Coke let’s safe way see
into the inventory
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Network Components
(Three pieces: sender, medium, receiver)
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Server
Client
Cable (optional)
Network Interface Card (NIC)
Network Interface Card (NIC)
Network Operating System (NOS)
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Physical Transmission Media
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 Twisted Pair - similar to phone wire
 Cooper wire – 300ftHubs – Refresh the signal
 Cheaper than fiber optics- Put into the classrooms
 Coaxial Cable - like cable TV wire, (thick, thin)
 Not seeing this any more
 Fiber Optics
glass fiber, using light
 greater bandwidth
 lower attenuation, greater repeater spacing
 Railroad tracks to new york
 Under the ocean to Japan
 Fiber opt. between buildings at SPU- then twisted pair between
classrooms
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 Must have a network interface card - $150
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Wireless Transmission Media
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 Microwave – line of sight
 Satellite – microwave signals
 HEO - 22,000 mi. up, LEO - 500 mi. up
 Cellular, PCS (personal communication services) –
radio signals between cell towers
 Wireless LANs – IEEE 802.11b,a,g,n
 WiMAX – IEEE 802.16
 Bluetooth
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Network Hardware
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 Modems – analog, digital
 Network Cards - Ethernet, Wireless
 Repeaters
 Hubs, Switches, Bridges, Routers, Gateways
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Network Management Software
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 Manage user accounts
 Manage performance
 Assigning priorities
 Detecting and correcting errors
 Network management
 Traffic, security, capacity planning,…
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Network Topology
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 Star - using hubs, switches
 broadcast to all (?)
 Bus, e.g. Ethernet
 terminators
 maximum length
 uses Carrier Sense Multiple Access with Collision Detection
(CSMA/CD)
 Ring, e.g. Token Ring
 every workstation sends to next
 whoever has token, may send
 Star-Bus, Star-Ring Hybrids
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Network Protocols
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 Set of rules that allow communication
 All computers on a network must speak the same
“language”
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A common protocol
 Protocols determine…
 When a computer can send a message
 If a message is destined for your computer
 If your computer should pass a message along to another
computer
 OSI Model – 7 layer model
 TCP/IP
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Wireless Technology Advantages
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 don’t need cabling
 mobile
 good for
 historical buildings
 manufacturing environments – no cables
 real time inventory – walking around
 PDA - personal digital assistants
 Interference with other wireless users
 Not even a plug in option
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Client/Server Networks
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 Centralized account
 Single-point failure
management
 Users need only one
password for any machine
on the network
 High-powered servers
handle the “big” tasks
 Can have huge arrays of
disks and large numbers
of peripheral devices
The server is down…
 Need a dedicated server
machine
 High-end, expensive
 Somebody has to be the
administrator
 An extra employee?
 Administrator controls all
configuration and security
issues
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Network Management Model
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• Security Administration
• User/Group Administration
• Network Configuration
• System Config.
• Backup & Restore
• Media Control & Storage
• Database Management
• Transaction Data Collect
Data
Management
Administration
Integrated
Control
Planning &
Scheduling
• Workload Scheduling
• Performance Monitoring
• Performance Analysis
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• 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
• Remote Store Mgmt.
Collaboration
 Calendar
 Blog
 IM
 Podcast
 Desktop sharing
 Wikis
 Web Conferencing
Business Values / Ethical Issues
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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
 Neighbors access point?
 Tracking – GPS
Gerhard Steinke