Title: Chapter 10 Remote Access and Wireless Networking
1Chapter 10Remote Access and Wireless Networking
- Business Issues
- Logical Physical Topology
- Technology Hardware Software, Wireless
- Personnel Communication Services
2Business Issues
3Business Needs
- Telecommuting or Small Office Home Office (SOHO)
- Mobile computing for field representatives
- Remote technical support for customers
4Hidden Costs
- Communication carriers service costs
- Wiring bandwidth
- Management problems
5Functions
- Exchange e-mail
- Upload download files
- Remote access application programs
- Share LAN-attached resources
6Logical 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
7Security Consideration
- Password and its management
- Intrusion response
- Partitioning of data
- Encryption
- Dial-back systems
- Authentication protocol
8Token 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)
9Token Authentication - Management
- Encrypt data, ID, password between client and
server - Auditable for failed attempts
- Limited remote access (time day)
- Interoperate authentication server
communication server
10Physical 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
11Hardware
- 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
12Software Types
- Remote node software
- Remote control software
- Mobile-aware OS
- Mobile-aware application
- Mobile middleware
13Remote Node Software
- Consideration
- Protocols, modem, client support
- Management
- Security
- Types Windows NT RAS NetWare Connect
- PPP clients work with different server NOS
14Remote Control Software
- Guest (remote) host (local)
- Consideration
- Compatibility (protocol, LAN)
- Applications (file transfer etc.)
- Security (virus etc.)
- Avoid lock of host PC
15Mobile-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
16Mobile-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
17Mobile Middleware
- Function consolidate multiple client application
request into a single transmission - Pros
- Flexibility
- Performance
18Improve Remote Software Performance
- V.34 modems
- ISDN services
- 16550 UARTs and matching serial port drivers
- Data compression software/hardware
- Communication software
- Compatibility
19Mobile 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
20Wireless
- Transmission technology
- Spread spectrum transmission
- Infrared transmission
- Standards
- IEEE 802.11
- Mobil IP (client, home agent)
21Spread 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
22Wireless 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)
23Selection Criteria of WAN Services
- Content
- Geographic scope
- Amount of data
- Urgency
- Compatibility with LAN
24CDPD
- Transaction processing and database queries
- Pros
- Fast call setup
- Inexpensive for short messages
- Cons
- Limited availability
- Expensive for large file transfers
25Circuit-switched Cellular
- Large file transfers and faxes
- Pros
- Widely available
- Reasonable price for longer transaction
- Cons
- Longer call setup time
- Expensive for short message
26Private 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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28Enhanced Paging or Two-way Messaging
- Guaranteed delivery
- Return receipt
- McCaw Cellular
29Enhanced Specialized Mobile Radio
- One or two way
- Voice, paging, or message
30Microcell Spread spectrum
31Analog Cellular
- Modems support cellular transmission at both ends
- Cellular enhanced modem at mobile telephone
switching office (MTSO) - Advanced mobile phone service
- 800 MHz
32Digital CellularPersonal Communications Services
- Personal phone number PPN
- Standards
- Time division multiple access (TDMA)
- Code division multiple access (CDMA)
- No modem
- Social impact and changes
33Assignment
- Review chapters 8-10
- Read chapter 11