OMIS 660 FINAL EXAM ALL POSSIBLE QUESTIONS AND ANSWERS 2024 ALREADY GRADED A+

OMIS 660 FINAL EXAM ALL POSSIBLE QUESTIONS AND ANSWERS 2024 ALREADY GRADED A+ Wireless network standards operate at ______? Ans- The data link layer Wireless network standards are ________ standards. Ans- OSI Wi-Fi Standards come from the ________ Working Group. Ans- 802.11 We use the terms Wi-Fi and ________ interchangeably in this book. Ans- 802.11 Wireless access points typically link wireless clients to ________. Ans- Servers on the wired network. Compared to wired transmission, propagation problems in radio transmission are __________. Ans- Worse Wireless radio transmission speed is usually measured in terms of __________. Ans- Frequency Frequency is measured in terms of ________. Ans- Hertz Radio transmission is measured in terms of _________. Ans- Frequency (Check) The other wireless device is far away in a known direction. It would be better to use __________. Ans- Dish Antenna A cellular telephone uses a(n) ________. Ans- Omni-directional Antenna At 10 meters, a signal has a strength of 100 mW. About how strong will it be at 40 meters? Ans- Review Page 216 What propagation problem is especially bad in moist air? Ans- Absorptive Attenuation What propagation problem becomes worse as there is a large dense object between the sender and receiver? Ans- Shadow Zones What propagation problem becomes worse as frequency increases? Ans- Neither inverse square law attenuation, NOR electromagnetic interference Correct is Absorptive Attenuation and Dead (Shadow) Zone The frequency spectrum extends ________. Ans- To Infinity The most serious problem with wireless transmission in WLANs is _________. Ans- Multipath Interference 2.4 GHz and 5 GHz are _______. Ans- Service Bands (CHECK) To handle multiple conversations in radio transmission, you normally use multiple ________. Ans- Channels Signals in a transmission usually __________. Ans- Spread over a range of frequencies A channel extends from 55 MHz to 60 MHz. Its bandwidth is __________. Ans- None of the answers listed .... Correct is 5 MHz. To transmit very rapidly in RADIO, you need ___________. Ans- Wide Bandwidth Channels with wide bandwidths are called _________ channels. Ans- Broadband 802.11 standards are being developed to work in the _________ unlicensed band. Ans- Both 2.4 GHz and 5 GHz (CHECK) To transmit data very rapidly, you would want a _________ channel. Ans- Broadband The 2.4 GHz band supports ________ possible non-overlapping 20 MHz channel(s). Ans- 3 Companies are moving to the 5 GHz band because there is _________ than in the 2.5 GHz band. Ans- More bandwidth The 5 GHz band usually supports about _______ non-overlapping 20 MHz channel(s). Ans- 12 Spread spectrum transmission is used in WLANs because ___________. Ans- It is required by regulators. Keep in mind stronger security is NOT a benefit Spread spectrum transmission is used in WLANs for __________. Ans- More reliable transmission WLANs normally use ___________. Ans- Unlicensed Bands In unlicensed bands, ___________. Ans- You can use radios wherever you please A channel has more bandwidth than is necessary given data transmission speeds requirements in ____________ transmission. Ans- Spread Spectrum Which of the following uses OFDM? Ans- All 802.11 Both 802.11ac and 802.11n Access points take _________ from wireless devices and send them on to devices on the wire LAN. They also do the converse. Ans- Packets, NOT FRAMES 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? Ans- 2 Frames A single access point and the set of hosts it serves is called a(n) _________. Ans- BSS (Basic Service Set) _____________ have SSIDs. Ans- Wireless Access Points (CHECK) To use an access point, you need to know its ___________. Ans- SSID (CHECK) To connect to an access point, you must know its _______________. Ans- SSID (CHECK) An extended service set (ESS) is a group of BSSs that __________. Ans- Are connected to the same distribution system AND have the same SSID. In an extended service set, each access point _____________. Ans- Must have the same SSIDs Access points in the same ESS communicate via ____________. Ans- With the distribution system The standard for roaming among access points is ___________. Ans- 802.11r What happens if two nearby access points use the same channel? Ans- They will interfere with each other. 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? Ans- 1 ________ is a technique for preventing two wireless stations from transmitting at the same time and therefore interfering with each other. Ans- Media Access Control Media Access Control governs transmission by ___________. Ans- Access Points AND Wireless Hosts Always True, Sometimes True or Always False. In CSMA/CD_ACK, when a wireless NIC wishes to transmit, it listens for traffic. If there is traffic, it waits. When traffic stops, it may transmit immediately? Ans- Always False (CHECK - Page 231) CSMA/CD_ACK is ________. Ans- Reliable In __________, when a wireless host wishes to send, it first sends a message to the wireless access point asking for permission to send. When the access point sends back a ...............