Chapter 10 Remote Access and Wireless Networking

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Chapter 10Remote Access and Wireless Networking

• Business Issues
• Logical Physical Topology
• Technology Hardware Software, Wireless
• Personnel Communication Services

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Business Issues

• Needs
• Costs
• Functions

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Business Needs

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

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Hidden Costs

• Communication carriers service costs
• Wiring bandwidth
• Management problems

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Functions

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

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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

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Security Consideration

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

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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)

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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

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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

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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

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Software Types

• Remote node software
• Remote control software
• Mobile-aware OS
• Mobile-aware application
• Mobile middleware

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Remote Node Software

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

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Remote Control Software

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

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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

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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

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Mobile Middleware

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

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Improve Remote Software Performance

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

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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

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Wireless

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

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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

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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)

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Selection Criteria of WAN Services

• Content
• Geographic scope
• Amount of data
• Urgency
• Compatibility with LAN

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CDPD

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

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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

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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

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Enhanced Paging or Two-way Messaging

• Guaranteed delivery
• Return receipt
• McCaw Cellular

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Enhanced Specialized Mobile Radio

• One or two way
• Voice, paging, or message

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Microcell Spread spectrum

• Internet
• E-mail

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Analog Cellular

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

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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

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Assignment

• Review chapters 8-10
• Read chapter 11