Quiz 7 Communications and Networks
1. Discuss the components required for successful communications.
Sender - initiates instructions to transmit data, information.
Communication Device - connects communication device to communication channel.
Communication Channel - media on which data, information, or instruction travel.
Communication Device - connects the communication channel to receiving device.
Receiving Device - accepts the transmission of data,instruction or information.
2. Identify various sending and receiving devices.
•Wire pairs are commonly used in local telephone communication and for short distance digital data communication.
•They are usually made up of copper and the pair of wires is twisted together
•Data transmission speed is normally 9600 bits per second in a distance of 100 meter.
9. Describe commonly used communications devices.
Broadcast Radio
- 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. Users can send and receive wireless messages to and from smart phones, cell phones, handheld game consoles, and other personal mobile devices using text messaging, wireless instant messaging, picture messaging and video messaging. A wireless Internet access point lets people connect wirelessly to the Internet through a wireless Internet access point. A hot spot is a wireless network that provides Internet connections to mobile computers and devices. . A global positioning system (GPS) analyzes signals sent by satellites to determine an earth-based receiver’s geographic location. Many software products provide a means to collaborate, or work online with other users connected to a server. A document management system provides for storage and management of a company’s documents, such as word processing documents, presentations, and spreadsheets. Groupware is software that helps people work on projects or share information over a network. Voice mail allows someone to leave a voice message for one or more people. Web services describe standardized software that enables programmers to create applications that communicate with other remote computers.
4. List advantages of using a network.
- Speed
- Cost
- Security
- Centralized Software Management
- Resource Sharing
- Work group computing
- 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). In a client server setup, each component has a designated function in the network. Servers handle most of the network load, while workstations handle day-to-day tasks of users. 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.
- Network standards defines:
- Way devices access the medium
- Speed on different types of networks
- Types of network technology (cable / wireless)
- Protocols
- Rules on how devices communicate with each other
- Data format used
- Coding Scheme
- Error Handling
- Sequencing techniques etc.
- Hardware / Software Vendors try to meet these guidelines
- Standardizing Organization
7. Explain the purpose of communications software.
- is used to provide remote access to systems and is also used to exchange messages in text, audio and video format for the purpose of communication. This software sends and receives data over telephone lines through modems. The communication software allows computers in different geographical regions to communicate with each other through terminal emulators, file transfer programs, chat and instant messaging programs.
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 communication devices.
- Five types of digital dedicated lines are ISDN line, DSL, FTTP, T-carrier line and ATM.
-
Dial-up modem
- A dial-up modem converts digital signals to analog signals and vice versa
- Usually in the form of an adapter card
- Send and receive digital data from DSL(Digital Subscriber Line) / ISDN
- Sends and receives data over cable television (CATV) network
- Much faster than dial-up modem or ISDN
- Sometimes called a broadband modem
- Allows access to the Web wirelessly from a notebook computer, a smart phone, or other mobile device.
- Device that provides central point for cables in network.
- Router
Connects computers and transmits data to correct destination on network.
10. Discuss different ways to set up a home network.
Setting up a home network
Before you start: To decide what type of network to set up or to find out what hardware and cables you need, see What you need to set up a home network. That topic has information about the different types of networks (also known as network technologies), as well as hardware requirements for each type.
Once you know what type of network you want and have the necessary hardware, there are four possible steps to take (two of these are not always required):
1. Install any necessary hardware.
2. Set up an Internet connection (optional).
3. Connect the computers.
4. Run the Set Up a Wireless Router or Access Point wizard (wireless only).
Each of these steps is described in detail later in this article.
Start by setting up one computer. Once you set up the network and you are sure that the first computer is working correctly, you can add additional computers or devices.
Install the hardware
Install network adapters in any computers that need them. (Follow the installation instructions in the information that came with each adapter.)
Set up or verify an Internet connection (optional)
You don't need an Internet connection to set up a network, although most people want to use their network to share an Internet connection. To set up an Internet connection, you need a cable or DSL modem and an account with an Internet service provider (ISP). Then open the Connect to the Internet wizard and follow the instructions.
Connect the computers
Turn on all computers or devices, such as printers, that you want to be part of your network. If your network is wired Ethernet or HPNA, it should be set up and ready to use. You should test your network (see below) to make sure that all computers and devices are connected correctly.
Run the Set Up a Wireless Router or Access Point wizard
If your network is wireless, run the Set up a Wireless Router or Access Point wizard on the computer attached to the router.
· Open Set Up a Wireless Router or Access Point by clicking the Start button, clicking Control Panel, clicking Network and Internet, and then clicking Network and Sharing Center. In the left pane, click Set up a connection or network, and then click Set up a wireless router or access point.
The wizard will walk you through the process of adding other computers and devices to the network. For more information, see Add a device or computer to a network.
Test your network
It's a good idea to test your network to make sure that all of the computers and devices are connected and working properly. To test your network, do the following on each network computer: Click the Start button, and then click Network.
Changing TCP/IP settings
If you need to adjust TCP/IP settings for your network, see Change TCP/IP settings.
Connecting your mobile PC from work to your home network
To connect the mobile PC that you use at work to the Internet or to your work network from your home network, you must have a network connection set up at home. For information about using your mobile PC on your home network, see Switching between your home and workplace networks.
11. Identify various physical and wireless transmission media.
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| Cellular Phone |
 |
| Coaxial cable |
 |
| Fiber-optic Cable |
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| Twisted-pair cable |
Cellular radio
Microwave
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| Communication Satellite |
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