1. A channel has more bandwidth than is necessary given data transmission speeds
ID: 3758743 • Letter: 1
Question
1. A channel has more bandwidth than is necessary given data transmission speeds requirements in ________ transmission.
A. normal radio
B. reliable commercial
C. spread spectrum
D. licensed
2. In CSMA/CD+ACK, when a wireless NIC wishes to transmit, it listens for traffic. If there is traffic, it waits. When the traffic stops, it may transmit immediately.
A. always true
B. sometimes true
C. always false
3. In the 5 GHz band, how many channels can you have with 802.11ac with 80 GHz channels?
A. 1
B. 6
C. 12
D. 24
4. If two products both comply with 802.11 ac, they should have close to the same performance.
A. True
B. False
5. A wireless host sends a packet to a server on the company's wired Ethernet LAN via an access point. How many frames will be involved in this one-way transmission?
A. 1
B. 2
C. 4
D. There will be one frame for each switch along the way.
6. ________ is a technique for preventing two wireless stations from transmitting at the same time and therefore interfering with each other.
A. Creating extended service sets
B. Roaming
C. The distribution system
D. Media access control
7. An extended service set (ESS) is a group of BSSs that ________.
A. are connected to the same distribution system
B. have the same SSID
C. both A and B
D. neither A nor B
8. Spread spectrum transmission is used in WLANs for ________.
A. higher transmission speed
B. more reliable transmission
C. greater security
D. more efficient transmission
9. Wireless access points typically link wireless clients to ________.
A. wireless servers
B. servers on the wired network
C. both A and B
10. Which of the following only operates in the 5 GHz band?
A. 802.11b
B. 802.11ac
C. 802.11g
D. 802.11n
11. What happens if two nearby access points use the same channel? Classification: Application
A. They will interfere with each other.
B. They will be bonded for joint operation automatically.
C. They will be bonded for joint operation automatically if they are on the same ESS.
D. They will be bonded for joint operation automatically if they have the same SSID.
12. 2.4 GHz and 5 GHz are ________.
A. frequency spectrums
B. broadbands
C. channels
D. service bands
13. The 5 GHz band usually supports about ________ non-overlapping 20 MHz channel(s).
A. 1
B. 3
C. 7
D. 12
14. Beamforming can allow an access point to ________.
A. direct power to individual clients
B. send signals to two different clients at the same time
C. both A and B
D. neither A nor B
15. 802.11 standards are being developed to work in the ________ unlicensed band.
A. 2.4 GHz
B. 5 GHz
C. both A and B
D. neither A nor B
16. Companies are moving to the 5 GHz band because there is ________ than in the 2.5 GHz band.
A. more bandwidth
B. less absorptive attenuation
C. both A and B
D. neither A nor B
17. What propagation problem is especially bad in moist air?
A. absorptive attenuation
B. electromagnetic interference
C. multipath interference
D. inverse square law attenuation
18. Wireless network standards operate at ________.
A. the data link layer
B. the Internet layer
C. both A and B
D. neither A nor B
19. If an 802.11n client tries to use an 802.11ac access point, ________.
A. they will not be able to communicate
B. they will communicate using 802.11n
C. they will communicate using 802.11ac
D. either B or C
20. To handle multiple conversations in radio transmission, you normally use multiple ________.
A. channels
B. frequencies
C. service bands
D. wires
21. If more users move to an access point, this decreases ________.
A. individual throughput
B. aggregate throughput
C. both A and B
D. neither A nor B
22. There is an access point that serves eight wireless hosts. On how many channels will these devices transmit and receive during the course of an hour or two?
A. 1
B. 2
C. 8
D. 9
23. The standard for roaming among access points is ________.
A. 802.11r
B. 802.11s
C. 802.11W
D. the wireless handoff protocol
24. Which of the following uses OFDM?
A. 802.11ac
B. 802.11n
C. both A and B
D. neither A nor B
25. An access point can transmit to more than one wireless client at a time with ________.
A. bonding
B. MIMO
C. Multiuser MIMO
D. CSMC/CA+ACK
A. normal radio
B. reliable commercial
C. spread spectrum
D. licensed
Explanation / Answer
1) C
2) B
3) B
4) A
5) B
6) D
7) C
8) B
9) B
10) C
11) A
12) C
13) D
14) C
15) C
16) C
17) A
18) A
19) B
20) A
21) A
22) A
23) A
24) B
25) A
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