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ITT Tech Tucson NT 1210 Chapter 6 1)An enterprise campus LAN uses wired UTP Ethernet and wireless 802

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ITT Tech Tucson

NT 1210

Chapter 6

1)An enterprise campus LAN uses wired UTP Ethernet and wireless 802.11 LANs at the edge of the LAN. Looking at a particular floor in a particular building, all the devices connect to either a single Ethernet switch or single wireless access point, both of which sit in a wiring closet in the middle of the space. Which of the following is true about the distance limitations in this LAN?

a. All user devices, wired and wireless, can be up to 100 meters away, but no farther. b. All Ethernet user devices can be up to 100 meters away (but no farther), while WLAN devices can typically be farther away than 100 meters. c. All Ethernet user devices can be up to 100 meters away (but no farther), while WLAN devices must typically be closer than 100 meters. d. The Ethernet distances must be decreased to match the maximum distance supported by the wireless LAN.

 

 

2.            IEEE 802.11 standards define a maximum speed for an individual transmission, with some variables that affect 802.11n speeds. Assuming that 802.11n uses the narrower 20-MHz channel and a single stream, which of the following answers matches a particular standard to its maximum bit rate? a. 802.11g: 54 Mbps b. 802.11b: 54 Mbps c. 802.11a: 72 Mbps d. 802.11n: 150 Mbps

 

 

3.            An enterprise campus LAN uses wired UTP Ethernet and wireless 802.11 LANs at the edge of the LAN. A network engineer uses a WLAN testing tool to view the frames moving through the WLAN, and he notes the speeds of the various frames in a single WLAN that uses a single access point. Which of the following answers list a condition that could have affected the speeds that the engineer observed when testing the WLAN? (Choose two answers.) a. None. The speed must be the same for every frame transmission with the same WLAN and same AP. b. The current radio noise. c. Whether the AP uses CSMA/CA. d. The distance between the client device and the AP.

 

 

4.            An enterprise campus WLAN uses a single 802.11n AP, with 20 clients that all use 802.11n. The AP uses only a single stream, but it does use a double- wide channel, with a maximum data rate for a single transmission of 150 Mbps. The same floor has an Ethernet LAN, with 20 PCs connected using 10BASE-T, UTP cabling. The Ethernet switch and AP both connect to the rest of the network using a Gigabit Ethernet interface. Which of the following statements are true when comparing the wired and wireless LANs on this floor? (Choose two answers.)   a. The wired LAN has a larger capacity. b. The wireless LAN has a larger capacity. c. The wired and wireless LAN capacity cannot be compared. d. A single transmission from the AP to a WLAN user device goes faster than the transmission from the Ethernet switch to a wired user device.

 

 

5.            A network engineer is designing a campus LAN, both wired and wireless. When planning the wireless LAN, the engineer looks at a scale drawing of the space for each floor and draws the coverage area associated with each AP. Which of the following answers describes the most accurate method the engineer can use to determine the coverage area? a. Do a wireless site survey. b. Read the IEEE standard for the specific 802.11 standard the

engineer plans to use for each AP, and find the coverage area maximum distances. c. Read the coverage area guaranteed distances from the AP vendor’s documentation. d. None of the answers is correct.

 

 

6.            Many groups have a positive impact on the development of wireless LAN standards. Which of the following plays the biggest role in testing and certifying products to prove that they work with other products that have already been certified? a. ITU   b. IEEE   c. Wi-Fi Alliance   d. The vendor that made the new product

 

 

7.            Which of the following answers define a wireless LAN physical layer standard that was originally ratified by the IEEE before the year 2000? (Choose two answers.) a. 802.11a b. 802.11b c. 802.11c d. 802.11g

 

 

8.            Which of the following locations is the least likely place to find a wireless LAN? a. In a coffee shop to provide Internet access as a WLAN hotspot b. As a link between two Ethernet switches on two different floors of the same building c. In someone’s home d. At the edge of a campus LAN (where the user devices sit)

 

 

9.            Which of the following wireless LAN topologies use at least one wireless access point? (Choose two answers.) a. BSS b. ESS c. IBSS d. SSID

 

 

10.          Which of the following is true of an ESS WLAN topology but not a BSS WLAN topology?

a. Clients sends frames to/from the access point and not directly to/from each other. b. The wireless LAN uses only IEEE 802.11g and more recent standards. c. The wireless LAN has at least two access points.   d. The wireless LAN has a minimum coverage area of 300 feet.

 

 

11.          An IT worker buys an AP at the local office supply store and installs it. He then gets out a tape measure and measures the distance from the AP to the cubicles used by Amy (20 feet), Bob (50 feet), and Chuck (150 feet). Each user uses his or her tablet computer from a cubicle. The WLAN uses the 802.11g standard, with a 54-Mbps maximum speed. Which answer is most likely to be true about how these user’s tablets work? a. Chuck’s tablet will either work at 54 Mbps or not work at all. b. Chuck’s and Bob’s tablets never use 54 Mbps to send frames because they sit more than 65 feet from the AP (802.11g’s maximum distance for maximum speed). c. Chuck’s tablet is more likely to work at a slower speed than Alice’s tablet. d. All three tablets will have no trouble sending at 54 Mbps because they sit within the 802.11 maximum distance of 100 meters (330 feet).

 

 

 

12.          An IT worker installs a wireless AP, but then realizes through testing that the coverage area does not cover the entire floor of the building. The building is in the shape of a long, skinny rectangle. Which of the following could be used to help change the shape of the coverage area so that it reaches all parts of that floor? (Choose two answers.) a. Increase gain. b. Replace the antenna with an omnidirectional antenna. c. Replace the antenna with a directional antenna. d. Lower the value of the SSID.

 

 

13.          In the IEEE 802.11g standard, how many nonoverlapping frequency channels exist? a. 1 b. 2 c. 3 d. 4

 

 

14.          Which of the following types of energy are not part of the electromagnetic spectrum? (Choose two answers.) a. Thermal b. Gamma radiation c. Visible light d. High-pitched sounds

 

 

15.          Which of the following are true about the frequency bands used by WLANs, but not true about the frequency channels used by wireless LANs? (Choose two answers.) a. Defines a set of consecutive frequencies b. Regulated by the FCC in the United States c. Defined by IEEE standards d. Applies to devices that have nothing to do with wireless LANs

 

 

16.          Which of the following fields in an 802.11 frame have the same format and meaning as a field in an 802.3 frame? (Choose three answers.) a. Destination MAC Address b. Sender MAC Address c. Preamble d. Frame Check Sequence

 

 

17.          A user brings his tablet computer into the office where a wireless LAN exists. When the user turns on the tablet, the tablet detects two wireless LANs. Which of the following 802.11 frames or processes plays a key role in the tablet discovering the presence of these wireless LANs? a. Autonegotiation (process) b. Beacon (frame)   c. Discover (frame)   d. Associate (frame)

 

 

18.          A user brings his tablet computer into the office where a wireless LAN exists. The client discovers three nearby APs that make up the Certskills wireless LAN. The client connects to the Certskills WLAN successfully and starts surfing the web. Assuming that the APs are named AP1, AP2, and AP3, which of the following is true about how the client uses this WLAN? a. The client sends data only through the AP from which it received the first beacon.   b. The client sends data only through the AP with which it exchanged Associate frames. c. The client sends a frame, and all three APs receive the frame and negotiate as to which one forwards the frame. d. The client load-balances frames by sending one frame to AP1, the next to AP2, then AP3, repeating the process.

 

 

19.          A wireless client has started using a WLAN, sending all its frames through an AP named AP1. The client sends an 802.11 data frame to the AP. The frame’s destination MAC address is in the same wireless LAN. Which of the following will the AP do when processing this data frame received from the wireless client? (Choose two answers.) a. The AP will discard the frame, expecting that the destination client will have overheard the frame anyway. b. The AP will translate the 802.11 header into an 802.3 header. c. The AP will look for the frame’s destination MAC address in its MAC address table. d. The AP can queue the frame temporarily, waiting for the AP’s turn to send data over the WLAN.

 

 

20.          A wireless client has started using a WLAN, sending all its frames through an AP named AP1. The client sends an 802.11 data frame to the AP. The frame’s destination MAC address is on the Ethernet LAN that sits on the other side of the AP. Which of the following will the AP do when processing this data frame received from the wireless client? (Choose two answers.)   a. The AP will forward the frame to a router, because routers work well at connecting different types of LANs and WANs. b. The AP will translate the 802.11 header into an 802.3 header. c. The AP will look for the frame’s destination MAC address in its MAC address table. d. The AP can queue the frame temporarily, waiting for the AP’s turn to send data over the WLAN.