Chapter 6 Notes

Chapter 6 Notes

1. Principles of Networking

   • Mail delivery system
     • Telephone system
       • Public transportation system
         • Corporate computer network
           • The Internet

2. Many different types of devices can connect to a network:

   • Desktop computers
     • Laptop computers
       • Tablet computers

3. A network can share many different types of resources and data:

   • Services, such as printing or scanning Storage space on removable devices, such as hard drives or optical drives Applications, such as databases Information, stored on other computers Documents Calendars, synchronizing between a computer and a smartphone

4. Network devices link together using a variety of connections:

   • Copper cabling
     • Uses electrical signals to transmit data between devices
     • Fiber-optic cabling
       • Uses glass or plastic fiber to carry information as light pulses
       • Wireless connection
         • Uses radio signals, infrared technology, or satellite transmissions

5. Bandwidth is measured in bits per second and is usually denoted by any of the following units of measure

   • b/s - bits per second
     • Mb/s - megabits per second
     • Gb/s - gigabits per second
   • kb/s - kilobits per second

6. Simplex Simplex, also called unidirectional, is a single, one-way transmission. An example of simplex transmission is the signal that is sent from a TV station to your home TV.

7. Half-Duplex- When data flows in one direction at a time it is known as half-duplex, as shown in the figure. With half-duplex, the channel of communications allows alternating transmission in two directions, but not in both directions simultaneously. Two-way radios, such as police or emergency communications mobile radios, work with half-duplex transmissions

8. Full-Duplex When data flows in both directions at the same time it is known as full-duplex, as shown in the figure.

9. You can assign the following IP address configuration information to a host:

   • IP address - identifies the computer on the network
     • Subnet mask - is used to identify the network on which the computer is connected
   • Default gateway - identifies the device that the computer uses to access the Internet or another network
     • Optional values - such as the preferred Domain Name System (DNS) server address and the alternate DNS server address
   • Read - The user can view the file and subfolder names, navigate to subfolders, view data in files, and run program files. Change - In addition to Read permissions, the user can add files and subfolders.

10. Fixed WiMAX - A point-to-point or point-to-multipoint service with speeds up to 72 Mb/s and a range of 30 miles (50 km).

    • Mobile WiMAX - A mobile service, like Wi-Fi, but with higher speeds and a longer transmission range

11. Analog telephone, also called plain old telephone service (POTS), transmits over standard voice telephone lines. This type of service uses an analog modem to place a telephone call to another modem at a remote site, such as an Internet service provider. The modem uses the telephone line to transmit and receive data.