Chapter 10 Remote Access and Wireless Networking - PowerPoint PPT Presentation

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Chapter 10 Remote Access and Wireless Networking

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Chapter 10 Remote Access and Wireless Networking Business Issues Logical & Physical Topology Technology: Hardware & Software, & Wireless Personnel Communication Services – PowerPoint PPT presentation

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Title: Chapter 10 Remote Access and Wireless Networking


1
Chapter 10Remote Access and Wireless Networking
  • Business Issues
  • Logical Physical Topology
  • Technology Hardware Software, Wireless
  • Personnel Communication Services

2
Business Issues
  • Needs
  • Costs
  • Functions

3
Business Needs
  • Telecommuting or Small Office Home Office (SOHO)
  • Mobile computing for field representatives
  • Remote technical support for customers

4
Hidden Costs
  • Communication carriers service costs
  • Wiring bandwidth
  • Management problems

5
Functions
  • Exchange e-mail
  • Upload download files
  • Remote access application programs
  • Share LAN-attached resources

6
Logical Topology
  • Remote node or remote access
  • Full client/server application
  • Use remote hard drive
  • Remote control
  • Keystrokes and screen image
  • Input or output device for local PC
  • Use local PC hard drive

7
Security Consideration
  • Password and its management
  • Intrusion response
  • Partitioning of data
  • Encryption
  • Dial-back systems
  • Authentication protocol

8
Token Authentication- Types
  • Types
  • Token response
  • Private identification number (client)
  • Challenge number (server)
  • Challenge response number (client)
  • Time-synchronous authentication
  • Private identification number (client)
  • Random authentication number (client)
  • Random authentication number (server)

9
Token Authentication - Management
  • Encrypt data, ID, password between client and
    server
  • Auditable for failed attempts
  • Limited remote access (time day)
  • Interoperate authentication server
    communication server

10
Physical Topology
  • Wire or wireless
  • Serial port of a LAN-attached PC
  • Communication server
  • LAN modem (dial-in server) with four to eight PC
    Card (PCMCIA) slots

11
Hardware
  • Communication servers
  • Offer application
  • Serial ports, CPU(s), network interface card(s)
  • Remote node servers (gateway)
  • Offer remote node connection service
  • Application servers offer application
  • Compatibility, LAN WAN services, call
    management issue

12
Software Types
  • Remote node software
  • Remote control software
  • Mobile-aware OS
  • Mobile-aware application
  • Mobile middleware

13
Remote Node Software
  • Consideration
  • Protocols, modem, client support
  • Management
  • Security
  • Types Windows NT RAS NetWare Connect
  • PPP clients work with different server NOS

14
Remote Control Software
  • Guest (remote) host (local)
  • Consideration
  • Compatibility (protocol, LAN)
  • Applications (file transfer etc.)
  • Security (virus etc.)
  • Avoid lock of host PC

15
Mobile-aware OS Functions
  • Auto-detection of multiple configurations
  • Built-in multiprotocol remote node client
  • Direct cable connection
  • File transfer and file/directory synchronization
  • Deferred printing
  • Power management
  • Infrared connection

16
Mobile-aware Applications Oracle Mobile Agents
(Oracle-in-Motion)
  • 501 performance increase
  • Client/agent/server architecture
  • Message manager (client) tracking pending
    requests on various servers through LAN links or
    PPP-based dial-up links
  • Message gateway(server) message holding station
    between message manager and intelligent agent on
    server to minimize overhead
  • Agent event manager (intelligent agent on
    server) represents mobile client during entire
    processing on server to save bandwidth and
    transmission time

17
Mobile Middleware
  • Function consolidate multiple client application
    request into a single transmission
  • Pros
  • Flexibility
  • Performance

18
Improve Remote Software Performance
  • V.34 modems
  • ISDN services
  • 16550 UARTs and matching serial port drivers
  • Data compression software/hardware
  • Communication software
  • Compatibility

19
Mobile MIB
  • Balance between bandwidth information
  • Information
  • Current user location
  • Type and speed of connection device
  • Type of remote client or remote control software
  • Battery power
  • Memory

20
Wireless
  • Transmission technology
  • Spread spectrum transmission
  • Infrared transmission
  • Standards
  • IEEE 802.11
  • Mobil IP (client, home agent)

21
Spread Spectrum Transmission
  • Frequency-hopping spread spectrum (FHSS)
  • Hops within the frequency range
  • Less interference
  • Good for mobile computing
  • Direct-sequence spread spectrum (DSSS)
  • 10 bits to data message for id
  • Complexity, cost, overhead to processing id
  • superior throughput

22
Wireless WAN Service
  • Circuit-switched analog cellular
  • CDPD (Cellular digital packet data)
  • Private packet radio
  • Enchanced paging and two-way messaging
  • ESMR (enhanced specialized mobile radio)
  • Microcellular spread spectrum
  • PCS (personal communications services)

23
Selection Criteria of WAN Services
  • Content
  • Geographic scope
  • Amount of data
  • Urgency
  • Compatibility with LAN

24
CDPD
  • Transaction processing and database queries
  • Pros
  • Fast call setup
  • Inexpensive for short messages
  • Cons
  • Limited availability
  • Expensive for large file transfers

25
Circuit-switched Cellular
  • Large file transfers and faxes
  • Pros
  • Widely available
  • Reasonable price for longer transaction
  • Cons
  • Longer call setup time
  • Expensive for short message

26
Private Packet Radio
  • Short bursty messages and e-mail
  • Pros
  • Wide area
  • Connect to e-mail system
  • Cons
  • Proprietary networks
  • Expensive for large file transfer

27
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28
Enhanced Paging or Two-way Messaging
  • Guaranteed delivery
  • Return receipt
  • McCaw Cellular

29
Enhanced Specialized Mobile Radio
  • One or two way
  • Voice, paging, or message

30
Microcell Spread spectrum
  • Internet
  • E-mail

31
Analog Cellular
  • Modems support cellular transmission at both ends
  • Cellular enhanced modem at mobile telephone
    switching office (MTSO)
  • Advanced mobile phone service
  • 800 MHz

32
Digital CellularPersonal Communications Services
  • Personal phone number PPN
  • Standards
  • Time division multiple access (TDMA)
  • Code division multiple access (CDMA)
  • No modem
  • Social impact and changes

33
Assignment
  • Review chapters 8-10
  • Read chapter 11
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