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Chapter 8

Chapter 8 Study Guide

Network Fundamentals Chapter 8

Multiple Choice
Identify the choice that best completes the statement or answers the question.

____ 1. In wireless communication, to exchange information, two antennas must be tuned to the same ____.
a. frequency c. attenuation speed
b. variance d. port


____ 2. A directional antenna issues wireless signals along a(n) ____ direction.
a. open c. wide
b. narrow d. single


____ 3. In ____, a wireless signal splits into secondary waves when it encounters an obstruction.
a. reflection c. diffraction
b. scattering d. bounce back


____ 4. ____ is a most significant problem for wireless communications because the atmosphere is saturated with electromagnetic waves.
a. Attenuation c. Diffraction
b. Fading d. Interference


____ 5. In ____ wireless systems, the result is a point-to-point link.
a. mobile c. fixed
b. variable d. open


____ 6. In ____ scanning, the station transmits a special frame, known as a probe, on all available channels within its frequency range.
a. active c. fixed
b. passive d. open


____ 7. A unique characteristic of the 802.11 data frame is its ____ field.
a. Frame Control c. Data
b. Sequence Control d. Duration


____ 8. The average geographic range for an 802.11a antenna is ____ meters.
a. 20 c. 330
b. 100 d. 600


____ 9. ____ is the least popular WLAN standard.
a. 802.11a c. 802.11g
b. 802.11b d. 802.11n


____ 10. An 802.11g antenna has a geographic range of ____ meters.
a. 20 c. 300
b. 100 d. 330


____ 11. ____ may use either the 2.4-GHz or 5-GHz frequency range.
a. 802.11a c. 802.11g
b. 802.11b d. 802.11n


____ 12. ____ is an 802.11n feature that allows two adjacent 20-MHz channels to be combined to make a 40-MHz channel.
a. Channel bonding c. Frame aggregation
b. Channel aggregation d. Frame bonding


____ 13. ____ is an 802.11n network feature allowing the combination of multiple frames into one larger frame.
a. Channel bonding c. Frame aggregation
b. Channel aggregation d. Frame bonding


____ 14. Using Bluetooth version 2.0, communicating nodes can be as far as ____ meters apart.
a. 30 c. 300
b. 100 d. 330


____ 15. ____ is a command-line function for viewing and setting wireless interface parameters and it is common to nearly all versions of Linux and UNIX.
a. ipconfig c. config
b. iwconfig d. ivconfig


____ 16. If intermittent and difficult-to-diagnose wireless communication errors occur, ____ might be the culprit.
a. incorrect encryption c. interference
b. SSID mismatch d. incorrect antenna placement


____ 17. LEO satellites orbit the Earth with an altitude as low as ____ miles.
a. 100 c. 6,000
b. 1240 d. 22,300


____ 18. ____ satellites are the type used by the most popular satellite Internet access service providers.
a. Transponder c. Low Earth orbiting
b. Medium Earth orbiting d. Geosynchronous orbiting


____ 19. Satellite Internet access providers typically use frequencies in the C- or ____ bands.
a. L- c. Ku-
b. S- d. Ka-


____ 20. Dial return satellite Internet access is a(n) ____ technology.
a. symmetrical c. proprietary
b. asymmetrical d. open source


____ 21. Satellite return Internet access is a(n) ____ technology.
a. symmetrical c. proprietary
b. asymmetrical d. open source


Matching

Match each item with a statement below:
a. mobile wireless f. 802.11b
b. fixed wireless g. 802.11a
c. access point h. 802.11g
d. uplink i. 802.11n
e. downlink


____ 22. Uses DSSS (direct-sequence spread spectrum) signaling.

____ 23. The locations of the transmitter and receiver do not move.

____ 24. Uses channels in the 5-GHz band and provides a maximum theoretical throughput of 54 Mbps.

____ 25. Accepts wireless signals from multiple nodes and retransmits them to the rest of the network.

____ 26. Transmission from a satellite transponder to an earth-based dish-shaped antenna.

____ 27. Uses the 2.4-GHz frequency band and provides a maximum theoretical throughput of 54 Mbps.

____ 28. The receiver can be located anywhere within the transmitter’s range.

____ 29. The creation of a communications channel for a transmission from an Earth-based transmitter to an orbiting satellite.

____ 30. Boasts a maximum throughput of 600 Mbps.
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