Thursday, 27 December 2007

wcs07 Wireless Communication Chapter01

1. Ultra Wide Band technology is used primarily for connecting devices inside the home at very high speeds.

2. Bluetooth devices communicate using small radio tranceiver calls radio modules that are built onto microprocessor chips.

3. WAP provides a standard way to transmit,format, and display internet data on cell phones.

4. IEEE 802.11g devices can be as far as 300 feet apart and can send and receive data at rates up to 54 million bits per second (Mbps).

5. Each bluetooth device use a link manager, which is special software that helps identity other bluetooth devices.

6. Bluetooth can send data through physical barriers, like walls. True.

7. A Bluetooth device can transmitt data at up to 1Mbps over a distance of 33 feet (10 meters). True.

8. A wireless network interface card performs basically the same functions and looks identical to a tradition network interface card (NIC). True but except that it does not have a cable that connects it to a network jack in the wall.

9. An earth station transmiss to a satellite at one frequency, and the satellite regenerates and transmits the signal back to earth at another frequency.True

10. Eliminating installation costs is a disadvantage of a WLAN. True

11. The automatic connection between various Bluetooth devices creates a network called a(n) link manager.

12. The new third generation (3G) cellular technology will allow data to be transmitted at a maximum speed of up to 2 Mbps.

13. The wireless NIC sends its signals through invisible radio waves to a(n) PC.

14. Ultra Wide Band (UWB)uses wireless transmissions for data communications as much as 35 miles apart.

15. "WAP" stands for Wireless Application Protocol.

16. Q: Explain the role of an access point in a WLAN.
A: The access point (AP) relays data signals between all of the devices inthe network, including file servers, printers, and even other access points and the wireless devices connected to them.

17. Q: Explain how a WAP cell phone works to send and receive Internet data.
A: Example in the Joseph's case.
Joseph uses his cell phone to connect to a Web server. The cell phone connects to the nearest cell tower, which connects to the local telephone company, which in turn calls his local Internet Provider and completes the connection to the Web server. The contents of the Web page are then sent back to Josepg's phone.

18. Q: Explain how a WLAN can be used in a classroom.
A: Please recognize the case: using a WLAN supplies connectivity between the notebooks.

19. Q: Describe how wireless networks can reduce installation time.
A: The time required to install network cabling is generally significant. Installers must pull wires through the ceiling and then drop cables down walls to network cutlets. This can take days or even weeks to complete. During that time, employees must somehow continue their work in the midst of the construction zone, which is often difficult to do.Using a wireless LAN eliminates such disruption.

20. Q: Explain how implementing a wireless networks can be helpful in case of disaster recovery.
A: In the event of a disaster, managers can quickly relocate the office, without needing to find a new facility with network wiring.Instead, the network servers are installed in the building along with the access points, and the laptop computers are distributed to the resettled employees.

Reference : Wireless# Guide to Wireless Communications Second Edition By: Jorge Olenewa and Mark Ciampa

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