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Final chapter 7

Data Comm

QuestionAnswer
1. 802.11n uses _____ as its frequency band(s). a. 2.4Ghz b. 5 Ghz c. 7.4 Ghz d. 2.4 and 5 Ghz D. 2.4 and 5 Ghz
2. Bluetooth divides the 2.4 Ghz band into how many channels? a. 21 b. 79 c. 97 d. 127 B. 79
3. Bluetooth technology frequently changes which channel it operates on. What is this process called? a. Direct Sequence Spread Spectrum b. Distributed Coordination Function c. Frequency Hopping Spread Spectrum d. Point Coordination Function C. Frequency Hopping Spread Spectrum
4. How many channels does 802.11g provide in North America? a. 3 b. 7 c. 11 d. 13 C. 11
5. Which type of antenna transmits relatively equally in all directions? a. Microwave b. omnidirectional c. directional d. spread spectrum B. omnidirectional
6. What does the CA in CSMA/CD stand for? a. collision avoidance b. collision acceptance c. career advice d. collision anticipation A. collision avoidance
7. Two nodes are within range of an access point, but not within range of eachother. What is problem can occur? a. hidden node problem b. collision destruction problem c. routing loop problem d. monster truck rally problem A. hidden node problem
8. what is the maximum data rate of 802.11a? a. 54Kbps b. 6Mbps c. 11Mbps d. 54Mbps A. 54Kbps
9. 802.11n is backwards compatible with which wireless standards? B. b and g
10. 802.11g operates in which frequency spectrum? a. 2.4Ghz b. 5Ghz c. 7.4Ghz d. 2.4Ghz and 5Ghz A. 2.4gHZ
11. What is the maximum data rate of 802.15 (version 1.1)? a. 1Mbps b. 6Mbps c. 11Mbps d. 54Mbps A. 1Mbps
12. What is the recommended overlap for wireless networks to ensure smooth and transparent roaming? a. 60% b. 30% c. 15% d. 5% C. 15%
13. This is another name for marking curbs, sidewalks, and walls with symbols to identify unsecured wireless access points. a. War driving b. war dialing c. war chalking d. war erasable-markering C. war chalking
14. A basic form of security implemented on many inexpensive Access Points filters clients based on ________ addresses. a. port b. MAC c. IP d. SSID B. MAC
15. How often are WPA keys changed during wireless transmission? a. as often as the administrator configures it to change b. half as often as the DHCP lease is renewed c. twice as often as the DHCP lease is renewed d. every single packet D. Every single packet
16. What is the commercial name for the 802.11 standard? a. Bluetooth b. IR c. Wi-Fi d. WiMAX C. Wi-Fi
17. What is the commercial name for the 802.15 standard? a. Bluetooth b. IR c. Wi-Fi d. WiMAX A. Bluetooth
18. What is the commercial name for the 802.16 standard? a. Bluetooth b. IR c. Wi-Fi d. WiMAX D. WiMAX
19. Which 802.16 standard covers fixed position antennas? a. 802.16b b. 802.16d c. 802.16e d. 802.16g B. 802.16d
20. WPA2 is another name for what standard? a. 802.1q b. 802.11i c. 802.19 d. 802.15q B. 802.11i
21. Wireless LANs... a. must always connect to a wired lan b. must use only a single IEEE standard c. must follow every rule in the OSI model d. must use some form of CSMA D. Must use some form of CSMA
22. Which of the following offers the highest theoretical maximum data transmission speed? a. 802.11n b. 802.15 c. 802.16e d. 802.3 D. 802.3
23. What is the maximum data rate of 802.11b a. 1Mbps b. 11Mbps c. 54Mbps d. 250Mbps B. 11Mbps
24. Seamless transmission between Access Points as a user moves around is also called what? a. meandering b. wandering c. roaming d. hopping C. Roaming
25. Which CSMA/CA media access control protocol uses Request To Send and Clear To Send packets? a. PCF b. DCF c. PDF d. WWF A. PCF
26. Which of the following does NOT use the 2.4Ghz frequency spectrum? a. 802.11a b. 802.11b c. baby monitors d. cordless phones A. 802.11a
27. Which of the following CANNOT communicate directly with an 802.11b host? a. 802.11a AP b. 802.11g AP c. 802.11n AP d. another 802.11b host A. 802.11a AP
28. A bluetooth network is also called what? a. micronet b. microLAN c. piconet d. picoLAN C. Piconet
29. How many devices can occupy the same Bluetooth LAN? a. 4 b. 8 c. 79 d. 127 B. 8
30. Under ideal conditions, 802.16d can transmit 70Mbps at a distance of up to... a. 100 feet b. 100 meters c. 328 feet d. 30 miles D. 30 miles
31. Wireless LANs tend to be slower that wired LANs because... a. ...there is more overhead on a WLAN b. ...there are more lost packets on a WLAN c. ...wireless protocols require more error checking d. All of the above D. All of the above
32. What does SSID stand for? a. set service identifier b. service set identifier c. secure service identifier d. service security identifier B. Service set identifier
33. which of the following is NOT required to connect to a WLAN? a. an access point b. a router c. a wireless NIC d. wireless protocols B. A router
34. In point coordination function, a host must wait to receive this type of message before communicating on the network a. SSID b. DCF c. CTS d. RFC C. CTS
35. What is the physical topology of the 802.11 technologies? a. ring b. bus c. star d. mesh C. Star
36. What is the logical topology of the 802.11 technologies? a. ring b. bus c. star d. mesh B. Bus
37. If you connect an 802.11b host to an 802.11g AP, what will be the result? a. will connect and run at 54Mbps b. will connect and run at 11Mbps c. will connect and force all devices to run at 11Mbps d. will connect but will be unable to use WPA2 C. It will connect and force all devices to run at 11Mbps
38. 802.11b has a maximum range of approximately: a. 25 feet b. 300 meters c. 100 feet d. 500 feet D. 500 feet
39. Which protocol resolves the Hidden Node problem? a. CSMA/CA b. PCF c. DMS d. 802.11n B. PCF
40. What is the maximum range of Bluetooth devices? a. 33 feet b. 33 meters c. 300 feet d. 300 meters A. 33 feet
41. Which of the following is not a real Wi-Fi standard? a. 802.16d b. 802.11g c. 802.11a d. 802.11b A. 802.16d
42. what does WEP stand for? a. wireless equivalent privacy b. wired equivalent privacy c. wireless EAP protocol d. wireless excellence protocol B. Wired Equivalent Privacy
43. One major difference between WEP and WPA is... a. WPA is much easier to break b. WEP uses SSID and WPA does not c. MAC filtering only works with WPA d. WPA keys are longer than WEP keys D. WPA keys are longer than WEP keys
44. Installing a wireless network in an area where you already may have a wired infrastructure is called what? a. a converged network b. a roaming network c. an overlay network d. a combo network C. An overlay network
45. A site survey will help you determine... a. ...where causes of interference may be b. ...feasibility of desired coverage c. ...an estimated number of required APs d. All of the above D. All of the above
46. 802.16d is intended for what? a. connecting cell phones to IP networks b. getting the best range c. connecting stationary access points d. extending the range of 802.15 C. connecting stationary access points
47. How many times per second does Bluetooth change channels? a. 79 b. 127 c. 535 d. 1600 D. 1600
48. bandwidth refers to a. the range of frequencies available b. the speed of transmission c. the data rate d. the overhead A. the range of frequencies available
49. Bluetooth has what type of logical topology? a. ring b. bus c. star d. mesh C. Star
50. a directional antenna provides a. greater range, but in a single direction b. greater range in all directions c. greater attenuation, but in a single direction d. greater bandwidth in all directions A. greater range, but in a single direction
Created by: mikejcaputo