Chapter 7- Networks: mobile Business Flashcards
Network
A communications system created by linking two or more devices and establishing a standard methodology in which they can communicate
Network Categories
Local area network
Wide area network
Metropolitan area network
Local area network (LAN)
Connects a group of computers in close proximity, such as in an office building, school, or home
Wide area network (WAN)
Spans a large geographic area such as a state, province, or country
Metropolitan area network (MAN)
A large computer network usually spanning a city
Internet Service Providers
National service providers
Network access points
Regional service providers
National service providers (NSPs)
Private companies that own and maintain the worldwide backbone that supports the internet
Network access points (NAPs)
Traffic exchange points in the routing hierarchy of the internet that connects NSPs
Regional service providers (RSPs)
Offer internet service by connecting to NSPs, but they also can connect directly to each other
Bandwidth
The maximum amount of data that can pass from one point to another in a unit of time
- bit (bps vs BPS)
- bit rate
Broadband
A high speed internet connection that is always connected
- dial up
- cable
- digital subscriber line (DSL)
- T1, T3 circuits
Networks are differentiated by:
Architecture
Topology
Protocols
Media
Architecture
Peer to peer, client/server
Topology
Bus, star, ring, hybrid, wireless
Protocols
Ethernet, Transmission Control Protocol/internet protocol (TCP/IP)
Media
Coaxial, twisted-pair, fiber-optic
Client
A computer that is designed to request information from a server
Server
A computer that is dedicated to providing information in response to external requests
Client/server networks
Model for applications in which the bulk of the back end processing takes place on a server, while the front end processing is handled by the clients
Protocol
A standard that specifies the format of data as well as the rules to be followed during transmission
Interoperability
The capability of two or more computer systems to share data and resources, even though they are made by different manufacturers
Transmission Control Protocol/internet Protocol (TCP/IP)
Provides the technical foundation for the public internet as well as for large numbers of private networks
Domain name system (DNS)
Converts IP addresses into domains
TCP/IP applications
File transfer protocol (FTP)
Simple mail transfer protocol (SMTP)
Hypertext transfer protocol (HTTP)
Simple network management protocol (SNMP)
Network convergence
The efficient coexistence of telephone, video, and data communication within a single network, offering convenience and flexibility not possible with separate infrastructures
Unified communication (UC)
The integration of communication channels into a single service
Peer to peer (P2P)
A computer network that relies on the computing power and bandwidth of the participants in the network rather than a centralized server
- all computers in the network have access to the public files located on all other workstations
Voice over IP (VoIP)
Uses IP technology to transmit telephone calls
Internet protocol TV (IPTV)
Distributed digital video content using IP across the Internet and private IP networks
Benefits of a networked world
Sharing resources (intranet, extranet, virtual private network) Providing opportunities (order parts electronically reducing need for large inventories and enhancing efficiency) Reducing travel (networks provide the means for videoconferencing)
Challenges of a connected world
Security
Social, ethical, political issues
SSL certificate
An electronic document that confirms the identity of a website or server and verifies that a public key belongs to a trustworthy individual or company
Secure hypertext transfer protocol (SHTTP or HTTPS)
A combination of HTTP and SSL to provide encryption and secure identification of an internet server
Digital divide
A worldwide gap giving advantage to those with access to technology
Personal area networks (PAN)
Provides communication over a shirt distance that is intended for use with devices that are owned and operated by a single user
Bluetooth
Wireless PAN technology that transmits signals over short distances between cell phones, computers, and other devices
Wireless Lan (WLAN)
A local area network that uses radio signals to transmit and receive data over distances of a few hundred feet
Wireless Fidelity (wi-fi)
A means by which portable devices can connect wirelessly to a local area network, using access points that send and receive data via radio waves
Wireless Man (WMAN)
A metropolitan area network that uses radio signals to transmit and receive data
Worldwide interoperability for microwave access (WiMAX)
A communications technology aimed at providing high speed wireless data over metropolitan area networks
Wireless WAN (WWAN)
A wide area network that uses radio signals to transmit and receive data
Smartphone
Offer more advanced computing ability and connectivity than basic cell phones
Radio frequency identification (RFID)
Uses electronic tags and labels to identify objects wirelessly over short distances
Global Positioning System (GPS)
A satellite based navigation system providing extremely accurate position, time, and speed information
Geographic information system (GIS)
Consists of hardware, software, and data that provide location information for display on a multidimensional map
Location based services (LBS)
Applications that use location information to provide a service
Wireless network categories
Personal area networks
Wireless LANs
Wireless MAN
wireless WAN
Business applications of wireless networks
Radio frequency identification
GPS
geographic information system
Location based services
Benefits of business mobility
Enhances mobility Provides immediate data access Increases location and monitoring capability Improves work flow Provides mobile business opportunities Provides alternative to wiring
Challenges of business mobility
Protecting against theft
Protecting wireless connections
Preventing viruses on a mobile device
Addressing privacy concerns with RFID and LBS
Telecommunication systems
Enable the transmission of data over public or private networks
