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28 Cards in this Set
- Front
- Back
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9. What is the name for the special signal that contains information that a wireless node requires in order to associate itself with an access point? a. broadcast frame b. hello packet c. beacon frame d. announcement message |
c. beacon frame |
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10. Which 802.11 frame type is related to medium access and data delivery, and includes ACK and RTS/CTS frames? a. management frames b. control frames c. data frames d. extended frames |
b. control frames |
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15. How does the 802.11 data frame indicate how a large packet should be fragmented? a. it uses the preamble header b. the frame check sequence dictates packet size c. the sequence control field indicates how packets will be subdivided d. the duration field determines how long the station can transmit a packet, which then determines how it is divided. |
c. the sequence control field indicates how packets will be subdivided |
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17. How many data streams are used din 802.11ac Wave 2 devices? a. 2 data streams b. 3 data streams c. 4 data streams d. 8 data streams |
c. 4 data streams |
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25. What signal propagation phenomena causes a wireless signal to split into secondary waves when it encounters an obstruction? a. reflection b. bounce c. diffraction d. scattering |
c. diffraction |
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36. Which command below can be used on Linux to modify the SSID of the access point you choose to associate with? a. ifconfig b. iwconfig c. wlanconfig d. ipconfig |
b. iwconfig |
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47. In IEEE terminology, a group of stations that share an access point are said to be part of what option below? a. extended service set b. basic service set c. modified service set d. generic service set |
b. basic service set |
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58. How many address fields exist in an 802.11 frame? a. 2 b. 3 c. 4 d. 6 |
c. 4 |
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62. What is the maximum theoretical throughput of 802.11n? a. 54 Mbps b. 65 Mbps c. 600 Mbps d. 1.3 Gbps |
c. 600 Mbps |
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64. Which of the following is not a valid wireless network topology? a. bus b. infrastructure c. mesh d. ad hoc |
a. bus |
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71. Which 802.11 standard was the first to utilize the 5 GHz band? a. 802.11b b. 802.11a c. 802.11g d. 802.11n |
b. 802.11a |
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95. Ideally, stations must remain within what range of an access point in order to maintain optimal transmission speeds? a. 100 ft b. 200 ft c. 300 ft d. 600 ft |
c. 300 ft |
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167. A type of antenna that issues wireless signals along a signal direction, or path. Also called a directional antenna. f. omnidirectional antenna g. unidirectional antenna |
g. unidirectional antenna |
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168. A type of antenna that issues and receives wireless signals with equal strength and clarity in all directions. This type of antenna is used when many different receivers must be able to pick up the signal, or when the receiver's location is highly mobile. f. omnidirectional antenna g. unidirectional antenna |
f. omnidirectional antenna |
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169. The use of chalk to draw symbols on a sidewalk or wall within range of an access point. The symbols, patterned after marks that hobos devised to indicate hospitable places for food or rest, indicate the access point's SSID and whether it's secured. |
h. war chalking |
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170. An attack in which a Bluetooth connection is used to download data from a device without the owner's permission. |
b. bluesnarfing |
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183. Elaborate on the three different types of wireless network topologies. |
ad hoc- smaller wireless networks, in which a small number of nodes closely positioned need to exchange data, can be arranged in an ad hoc fashion. infrastructure- nearly all wireless networks use an infrastructure WLAN topology, which depends on an intervening connectivity device called a wireless access point mesh- it's common for a WLAN to include several access points. When these APs work as peer devices on the same network, they form a mesh WLAN, also called a wireless mesh network (WMN) |
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102. What is the max theoretical throughput of the 802.11ac wireless technology when using Wave 1 devices? a. 600 Mbps b. 1.3 Gbps c. 3.47 Gbps d. 6.93 Gbps |
b. 1.3 Gbps |
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103. At what layer of the OSI model do the 802.11 standards vary? a. physical layer b. network layer c. data link layer d. transport layer |
a. physical layer |
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106. Select below the band that is not one of the four frequency bands used in the 5 GHz range for wireless LANs: a. 5.1 GHz b. 5.3 GHz c. 5.4 GHz d. 5.9 GHz |
d. 5.9 GHz |
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108. In a 802.11 data frame, what is the size of the frame check sequence field? a. 2 bytes b. 4 bytes c. 6 bytes d. 8 bytes |
c. 6 bytes |
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117. Which 802.11 technology is the first Wi-Fi standard to approach gigabit Ethernet capabilities, and operates on the 5 GHz band? a. 802.11a b. 802.11b c. 802.11n d. 802.11ac |
d. 802.11ac |
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118. What 802.11 frame type is involved in association and reassociation, including probe and beacon frames. a. management frames b. control frames c. data frames d. extended frames |
a. management frames |
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120. What RFC outlines recommendations for private IP addresses? a. RFC 1900 b. RFC 1918 c. RFC 638 d. RFC 2332 |
b. RFC 1918 |
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190. Describe the hidden node problem, and explain how it can be mitigated. |
The hidden node problem occurs where a node is not visible to other nodes on the other side of a coverage area. One way to ensure that packets are not inhibited by other transmissions is to reserve the medium for one station's use. |
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191. Describe the 802.11a standard, and detail some of its history and advantages / disadvantages versus other 802.11 standards. |
The higher throughput of 802.11a, as compared with 802.11b, is attributable to its use of higher frequencies, its unique method of modulating data, and more available bandwidth. 802.11a signals are less likely to suffer interference from microwave ovens, cordless phones, motors, and other (incompatible) wireless LAN signals. |
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201. Provide information on fading, and describe the different effects that fading can have on wireless transmissions |
Wireless signals run into obstacles that will experience fading, or a variation in signal strength as a result of some of the electromagnetic energy being scattered, reflected, or diffracted after being issued by the transmitter. Multipath signaling is a significant cause of fading |
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204. Explain the difference between unidirectional antenna and omnidirectional antenna. |
A unidirectional antenna, (aka directional), issues wireless signals along a single direction. Omnidirectional antenna issues and receives wireless signals with equal strength and clarity in all directions. |
