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Sunday, July 24, 2011

Quiz #7

1. Discuss the components required for successful communications.
Successful communications requires a sending device that initiates a transmission instruction, a communications device that connects the sending device to a communications channel, a communications channel on which the data travels, a communications device that connects the communications channel to a receiving device, and a receiving device that accepts the transmission of data, instructions, or information.

2. Identify various sending and receiving devices.
A sending device initiates the transmission of data, instructions, and information while a receiving device accepts the items transmitted.
All types of computers and mobile devices serve as sending and receiving devices in a communications system. This includes mainframe computers, servers, desktop computers, notebook computers, Tablet PCs, smart phones, portable media players, and GPS receivers.

3. Describe uses of computer communications.
Communications technologies include the Internet, Web, e-mail, instant messaging, chat rooms, newsgroups, blogs, wikis, RSS, VoIP, FTP, Web folders, video conferencing, and fax machine or computer fax/modem.


4. List advantages of using a network.
  • Speed
  • Cost
  • Security
  • Centralized Software Management
  • Resource Sharing
  • E-mail
  • Work group computing 
5. Differentiate among client/server, peer-to-peer, and P2P networks.
A client server setup has servers, which are dedicated machines that perform specific functions in the network. A server can be used to manage a network's email (mail server), database (database server), files (file server), printers (print server), or access an anti-virus (security server). This division of labor between components make a client server setup more efficient than a peer-to-peer network.
- A peer-to-peer network setup Simple network that connects fewer than 10 computers. Each computer, or peer, has equal capabilities. 
P2P is an Internet peer-to-peer network Enables users to connect to each other’s hard disks and exchange files directly.

6. Describe the various network communications standards.
- Ethernet technology allows computers to contend for access to network  
-Token Ring technology controls access to network by requiring devices to pass a special signal called token.
-TCP/IP (Transmission Control Protocol/Internet Protocol) technology transmits data by breaking it up into small pieces, or packets
-802.11 (WiFi) is family of standards for wireless LANs
-Bluetooth Short-range radio waves transmit data between Bluetooth devices
-UWB specification allows data to be transferred wirelessly via short-range radio waves
-IrDA specification allows data to be transferred wirelessly via infrared light waves
-WiMax/802.16 standard that specifies how wireless devices communicate over the air in a wide area
-RFID    uses radio signals to communicate with a tag placed in an object 
-WAP allow wireless mobile devices to access Internet


7. Explain the purpose of communications software.
-Programs that help users establish connection to Internet, other network, or another computer 
-Programs that help users manage transmission of data, instructions, and information

-Programs that provide an interface for users to communicate with one another


  
8. Describe various types of lines for communications over the telephone network.
- PSTN Worldwide telephone system that handles voice-oriented telephone calls
-Dial Up Line Temporary connection using telephone line for communications 
-Dedicated Line Always-on connection between two communications devices


9. Describe commonly used communications devices.
- Dial Up Modems A dial-up modem converts digital signals to analog signals and vice versa

-ISDN/DSL Modems Usually external devices in which one end connects to a telephone line and the other    end connects to a port on the system unit 

-Cable Modem Sends and receives data over cable television network.Broadband modem.        
-Wireless Modem Allows access to the Web wirelessly from a notebook computer, a PDA, a smart phone, or other mobile device.

-Network Card Ø

Adapter card, PC Card, ExpressCard module, USB network adapter, or flash card that enables computer or device to access network .
,
-Wireless Access  Point 

Central communications device that allows computers and devices to transfer data wirelessly among themselves or wirelessly to a wired network .
-Router Connects computers and transmits data to correct destination on network.
 
-Hub or Switch Device that provides central point for cables in network.
 





             




  




  



 








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