Chapter 20 Practice Test Answers
1. B. Digital Subscriber Line (DSL) is a broadband technology that makes use of unused frequencies on normal telephone lines to transmit data at varying speeds, depending on the type of DSL being used.
2. A. Internet Connection Sharing (ICS) is software that allows several networked computers to share a single connection to the Internet.
3. A. Residential DSL uses a type of DSL called asymmetric DSL (ADSL), which uses its own phone line to send and receive data.
4. D. ADSL has a maximum distance of 18,000 feet.
5. D. VDSL has a data transfer speed of 26 Mbps.
6. C. In general, latency means delay. Latency defines the amount of time it takes for a data packet to get from one point to another.
7. C. In the Device Manager, locate the section for network adapters. Click it to expand it and display the individual network adapters. Locate the installed network adapter. If the icon for the adapter is a yellow circle with an exclamation point, this indicates a problem with the adapter. If the icon has a red X on it, that indicates the adapter is disabled.
8. B. First, the incoming television cable is cut and connected to one side of a splitter. Usually, it is connected to a port marked “In.”
9. A. Cable modem speeds for downstream traffic typically top out at about 1.5 Mbps, with actual performance in the range of 1 to 1.5 Mbps.
10. B. One advantage that cable has over DSL is that cable is not subject to the distance limitations of DSL. The distance limit for cable is virtually unlimited.
11. D. The cable light indicates whether the modem has a good connection to the service provider.
12. C. The test light indicates when a self-test is being performed. If the light remains lit, the cable modem has failed the self-test. If a modem fails the test, try recycling the power to reset the modem. If that does not fix the problem, trying replacing the modem.
13. A. Broadcast centers, also known as Earth centers, are used to transmit high-powered, high-frequency signals to the satellite.
14. B. Satellite communication systems send and receive signals between Earth-based stations and geosynchronous space satellites.
15. A, B, and D. Disadvantages of satellite technology include latency (delay in data transmission), noise due to a weakening signal over a long distance, and limited bandwidth.
16. B. Home satellite systems typically provide download speeds in the range of 150 to 500 Kbps, and upload speeds of 128 Kbps.
17. C. Always perform a communications test. Probably the easiest test to perform is to PING the hardware.
18. A. Verify that the service set identifier (SSID) is correct. Each wireless network has its own SSID. If it is incorrect, computer will ignore the AP and search for an AP with the specified SSID.
19. B. If a tone exists, a problem exists with the internal wiring. If you cannot hear a tone, the problem exists with the external wiring. In that case you will need to contact the telephone company.
20. C. AT&F will restore the default factory settings of your modem.