10.1

Question 1

a Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA)

Answer 1

controls media access and avoids (rather than detect) collisions

Question 2

Mesh topology

Answer 2

• This topology is rarely used because of the significant cost and work involved in having network components directly connected to every other component.
• If a break occurs in a segment of cable, traffic can still be rerouted using the other cables.
• It is common for partial topologies to be deployed. This balances cost and the need for redundancy.

Question 3

Ad hoc Topology

Answer 3

• Uses a physical mesh topology with a logical bus topology
• Is cheap and easy to set up.
• Cannot handle a large number of hosts.
• Requires special modifications to reach wired networks.

Question 4

Infrastructure Topology

Answer 4

• The network uses a physical star topology with a logical bus topology
• You can easily add hosts without increasing administrative efforts.
• The access point (AP) can be connected to a wired network easily, allowing clients to access both wired and wireless hosts.
• The placement and configuration of APs require planning to implement effectively

Question 5

Transmission mediums

Answer 5

• speeds are affected by distance, obstructions (such as walls), and interference
• you can either achieve the maximum distance or the maximum speed, but not both

Question 6

Wireless Network

Answer 6

• all devices on the network operate at the legacy speed

Question 7

Bluetooth

Answer 7

an open wireless technology standard for transmitting fixed and mobile electronic device data over short distances

Question 8

IR

Answer 8

the use of wireless technology in devices or systems that convey data through infrared radiation

Question 9

RFID (radio frequency identification)

Answer 9

is a form of wireless communication that incorporates the use of electromagnetic or electrostatic coupling in the radio frequency portion of the electromagnetic spectrum to uniquely identify an object, animal or person

Question 10

802.11a

Answer 10

Released after 802.11b, 802.11a has greater theoretical throughput and a greater coverage area.

Question 11

802.11b

Answer 11

Implemented as a standard in 1999. This standard provides 22 separate channels in the 2.4 GHz band. It can operate at speeds up to 11Mbps at a range of up to 50 meters.

Question 12

802.11g

Answer 12

Also used the 2.4 GHz band, is a reasonable upgrade path from 802.11b The main advantages are the throughput (54 Mbps) that it supported 802.11b transmissions.

Question 13

802.11n

Answer 13

provided 600 Mbps throughput over greater distances. This higher speed allowed voice and video communications to be supported.
-is backward compatible with 802.11g, 802.11b, and 802.11a.

Question 14

802.11ac

Answer 14

• provides well over 6 Gbps on the 5 GHz band,
• access points can handle multiple data streams on the same frequency
• often dual-band, meaning they can operate on the 2.4 GHz or 5GHz bands eliminating any compatibility issues with legacy equipment.

Question 15

2.4GHz

Answer 15

• unallocated, unlicensed band free for any purpose
• . Wi-Fi routers, some cordless telephones, and Bluetooth all operate on this frequency, creating the opportunity for interference between devices
• cell phones and AM radio signals do not operate on this range.

Question 16

5.0GHz

Answer 16

-unregulated band which is seeing a lot of use in the wireless networking environment

-

Question 17

Speed and distance requirements - 802.11a

Answer 17

Frequency- 5 GHz
Rated Throughput- 54 Mbps
Range- 100 m

Question 18

Speed and distance requirements - 802.11b

Answer 18

Frequency- 2.4 GHz
Rated Throughput- 11 Mbps
Range-50 m

Question 19

Speed and distance requirements -802.11g

Answer 19

Frequency- 2.4 GHz
Rated Throughput- 54 Mbps
Range- 100 m

Question 20

Speed and distance requirements- 802.11n

Answer 20

Frequency- 2.4 or 5 GHz
Rated Throughput- 600 Mbps
Range: Indoor – 70 m Outdoor- 250m

Question 21

Speed and distance requirements- 802.11ac

Answer 21

Frequency- 5 GHz

Rated Throughput- 1.3 Gbps - 6.93 Gbps

Range: Indoor – 70 m Outdoor – 250m

Question 22

Bluetooth

Answer 22

Frequency- 2.4 GHz
Rated Throughput- 3 Mbps
Range- 10 m @ 2.5 mW

Question 23

Channel bandwidth

Answer 23

Channels have a bandwidth of 22MHz. As a result, channels 1, 6, and 11 are commonly used to avoid overlap. These non-overlapping channels are 5MHz apart from the next closest non-overlapping channel.

Question 24

Channel bonding

Answer 24

combines two non-overlapping 20 MHz channels into a single 40 MHz channel, resulting in slightly more than double the bandwidth.

Question 25

Multiple Input- Multiple Output (MIMO)

Answer 25

increases bandwidth by using multiple antennas for both the transmitter and receiver. A system is described by the number of sending and receiving antennas. The 802.11n specifications allow up to four sending and four receiving antennas. The benefit of adding additional antennas declines as the number increases; going above 3x3 provides a negligible performance increase

Question 26

Multi-user MIMO

Answer 26

is an enhancement to MIMO that allows multiple users to use the same channel.

Question 27

(troubleshooting) Channel overlap

Answer 27

Choose a channel on the AP that is not used by other wireless devices