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ICT104 > Ch. 12 > Flashcards

Ch. 12 Flashcards

1
Q
  1. You need to install wireless Internet access in an open warehouse environment. After installing the equipment, the technician notices varying signal strengths throughout the warehouse. How do you make sure there is full coverage?
    A. Turn on broadcast key rotation.
    B. Change the encryption method used on all the APs.
    C. Change the antenna placement.
    D. Use channel bonding.
    E. Use channel shaping.
A
  1. C. It is imperative that a good site survey is completed before installing your wireless network. Trying various types of antennas and their placements is the key to covering the whole wireless area.
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2
Q 
2. What is the frequency range of the IEEE 802.11a standard?
A. 2.4Gbps
B. 5Gbps
C. 2.4GHz
D. 5GHz
A
  1. D. The IEEE 802.11a standard runs in the 5GHz RF range.
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3
Q 
3. What is the frequency range of the IEEE 802.11g standard?
A. 2.4Gbps
B. 5Gbps
C. 2.4GHz
D. 5GHz
A
  1. C. The IEEE 802.11b and IEEE 802.11g both run in the 2.4GHz RF range.
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4
Q 
4. Which devices can interfere with the operation of a wireless network because they operate on similar frequencies? (Choose two.)
A. Copier
B. Microwave oven
C. Toaster
D. Cordless phone
E. IP phone
F. AM radio
A
  1. B, D. If you are running 802.11b/g frequency, which most networks are, then you can receive interference from microwave ovens and cordless phones.
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5
Q 
5. Which wireless standard allows you to channel-bond to increase bandwidth and uses both the 2.4Ghz and 5Ghz frequencies?
A. 802.11b
B. 802.11g
C. 802.11a
D. 802.11n
A
  1. D. 802.11n uses channel bonding of both the 2.4Ghz range and the 5Ghz range to get increased bandwidth of over 100Mbps.
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6
Q 
6. How many non-overlapping channels are available with 802.11b?
A. 3
B. 12
C. 23
D. 40
A
  1. A. The IEEE 802.11b and g standards provide three non-overlapping channels.
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7
Q 
7. How many non-overlapping channels are available with 802.11a?
A. 3
B. 12
C. 23
D. 40
A
  1. B. The IEEE 802.11a standard provides up to 12 non-overlapping channels, or up to 23 if you add the 802.11h standard.
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8
Q 
8. What is the maximum data rate for the 802.11a standard?
A. 6Mbps
B. 11Mbps
C. 22Mbps
D. 54Mbps
A
  1. D. The IEEE 802.11a standard provides a maximum data rate of up to 54Mbps.
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9
Q 
9. You need to install wireless on multiple floors of a large building and maintenance area. What is your first concern before installing the APs?
A. Authentication
B. Encryption
C. Channel overlap
D. AP configuration
A
  1. C. If you have a large area to cover with wireless, you need to be concerned with channel overlap.
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10
Q 
10. What is the maximum data rate for the 802.11b standard?
A. 6Mbps
B. 11Mbps
C. 22Mbps
D. 54Mbps
A
  1. B. The IEEE 802.11b standard provides a maximum data rate of up to 11Mbps.
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11
Q
  1. You connect a new host to your company’s wireless network. The host is set to receive a DHCP address and the WEP key is entered correctly. However, the host cannot connect to the network. What can the problem be?
    A. DNS is not configured on the host.
    B. MAC filtering is enabled on the AP.
    C. The network has run out of wireless connections.
    D. The host is enabled to run 802.11b and 802.11g
A
  1. B. If everything is correctly configured on the host, then MAC filtering would stop the host from connecting to the AP. If you try to connect and can’t, check the AP’s settings.
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12
Q 
12. Which is the highest encryption that WPA2 can use?
A. AES-CCMP
B. PPK via IV
C. PSK
D. TKIP/MIC
A
  1. A. The IEEE 802.11i standard replaced Wired Equivalent Privacy (WEP) with a specific mode of the Advanced Encryption Standard (AES) known as the Counter Mode Cipher Block Chaining-Message Authentication Code (CBC-MAC) protocol. This allows AES-CCMP (AES-Counter Mode CBC-MAC Protocol) to provide both data confidentiality (encryption) and data integrity.
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13
Q
  1. Which additional configuration step is necessary in order to connect to an access point that has SSID broadcasting disabled?
    A. Set the SSID value in the client software to public.
    B. Configure open authentication on the AP and the client.
    C. Set the SSID value on the client to the SSID configured on the AP.
    D. Configure MAC address filtering to permit the client to connect to the AP.
A
  1. C. If you disable SSID broadcasting, which you should, then you must configure the SSID name on the clients that need to connect to the AP.
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14
Q 
14. Which spread-spectrum technology does the 802.11b standard define for operation?
A. IR
B. DSSS
C. FHSS
D. DSSS and FHSS
E. IR, FHSS, and DSSS
A
  1. B. The IEEE 802.11b standard uses Direct Sequence Spread Spectrum (DSSS). If you are running 802.11g, it uses Orthogonal Frequency Division Multiplexing (OFDM).
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15
Q
  1. Which wireless LAN design ensures that a mobile wireless client will not lose connectivity when moving from one access point to another?
    A. Using adapters and access points manufactured by the same company
    B. Overlapping the wireless cell coverage by at least 10 percent
    C. Configuring all access points to use the same channel
    D. Utilizing MAC address filtering to allow the client MAC address to authenticate with the surrounding APs
A
  1. B. If you are running an extended service set (meaning more than one AP with the same SSID name), you need to overlap the cell coverage by 10 percent or more so clients will not drop out while roaming.
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16
Q
  1. You have installed a point-to-point connection using wireless bridges and Omni-directional antennas between two buildings. The throughput is low. What can you do to improve the link?
    A. Replace the bridges with APs.
    B. Replace the Omni-directional antennas with Yagis.
    C. ConFigure 802-11a on the links.
    D. Install amps to boost the signal.
A
  1. B. You need to use directional antennas, like a Yagi, in order to get the best signal between antennas.
17
Q
  1. What does extended service set (ESS) ID mean?
    A. That you have more than one access point, and they are in the same SSID connected by a distribution system
    B. That you have more than one access point, and they are in separate SSIDs connected by a distribution system
    C. That you have multiple access points, but they are placed physically in different buildings
    D. That you have multiple access points, but one is a repeater access point
A
  1. A. Extended service set ID means that you have more than one access point, they all are set to the same SSID, and they are all connected together in the same VLAN or distribution system so users can roam.
18
Q
  1. What is one reason that WPA encryption is preferred over WEP?
    A. A WPA key is longer and requires more special characters than the WEP key.
    B. The access point and the client are manually configured with different WPA key values.
    C. WPA key values remain the same until the client configuration is changed.
    D. The values of WPA keys can change dynamically while the system is used.
A
  1. D. WPA is cool because it is easy to configure and works great. Type in a passphrase (assuming you’re using Pre-Shared Key), and you’re done. Plus, you have great security because the keys change dynamically.
19
Q 
19. How wide are the channels used in 802.11n in order to gain the large bandwidth that the specification provides?
A. 22MHz
B. 20Mhz
C. 40Mhz
D. 100Mhz
A
  1. C. 802.11n uses two 20MHz-wide channels to create a 40Mhz-wide channel, which provides over 100Mbps wireless.
20
Q
  1. 802.11n uses MIMO. How does this optimize throughput to gain the high speed advantage that 802.11n provides?
    A. By specifying an acknowledgment of each and every frame, 802.11n provides better overhead.
    B. Several frames are sent by several antennae over several paths and are then recombined by another set of antennae.
    C. One frame at a time is sent, but faster than in 802.11g because multiple antennas are used (multiple-in, multiple-out).
    D. MIMO packs smaller packets into a single unit, which improves throughput.
A
  1. B. 802.11n MIMO sends multiple frames by several antennae over several paths. The frames are then recombined by another set of antennae to optimize throughput and multipath resistance. This is called spatial multiplexing.

ICT104 (15 decks)

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