6.3 - Wireless Ethernet

Question 1

______________ (commonly called Wi-Fi) is the commercial name for a set of standards developed by the IEEE 802.11 standards group

Answer 1

Wireless Ethernet

Question 2

The 802.11 family of technologies is much like the Ethernet family — they reuse many of the Ethernet ________ components and are designed to connect easily into Ethernet LANs

Answer 2

802.3

Question 3

Logical and physical topologies of WiFi are the same as those of hub-based Ethernet: a __________ and a __________

Answer 3

physical star…logical bus

Question 4

Media access control in WiFi is ______________________________

Answer 4

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

Question 5

Before a computer can transmit in a WLAN, it must first establish an ______________ with a specific AP, so that AP will accept its transmission

Answer 5

association

Question 6

All types of WiFi are ____________________

Answer 6

backwards compatible

Question 7

Six types of WiFi:

Answer 7

1. 802.11a
2. 802.11b
3. 802.11g
4. 802.11n
5. 802.11ac
6. 802.11ad

Question 8

Under perfect conditions, it provides 8 channels of 54 Mbps, each with a maximum range of 50 meters or 150 feet

Answer 8

802.11a

Question 9

Under perfect conditions, it provides 3 channels of 11Mbps, each with a maximum range of 150 meters or 450 feet

Answer 9

802.11b

Question 10

Under perfect conditions, it provides 3 channels of 54 Mbps, each with a maximum range of 150 meters or 450 feet

Answer 10

802.11g

Question 11

Under perfect conditions, it provides 3 channels of 450 Mbps, each with a maximum range of 100 meters or 300 feet

Answer 11

802.11n

Question 12

The channels used for 802.11n are __, __, and ___ — designed such that channels do not overlap and cause interference with each other

Answer 12

1…6…11

Question 13

For 802.11n, it is also possible to configure a __________ so it combines all the channels into one “dual-band” channel that provides 600 Mbps

Answer 13

dual-band AP

Question 14

IEEE _________ is another obsolete version, but many organizations continue to use it because it is cheap

Answer 14

802.11n

Question 15

This version runs on two different frequency spectrums: 2.4 and 5 GHz

Answer 15

802.11ac

Question 16

One important innovation in 802.11ac is the the ____________________ (RTS/CTS) media access control is sent on a separate frequency range, so that it doesn’t interfere with data transmission

Answer 16

Request to Sent/Clear to Send

Question 17

Default modulation technique for 802.11ac is __________, increased from 64-QAM in 802.11n

Answer 17

256-QAM

Question 18

Sometimes called WiGig and is a specialized version of wireless Ethernet that has a maximum range of 10 meters (30 feet)

Answer 18

802.11ad

Question 19

Current products of 802.11ad have data rates of __________

Answer 19

7 Gbps

Question 20

WLANs you discover, with the intent of helping you break into them. This type of wireless reconnaissance is often called __________

Answer 20

wardriving

Question 21

With _______, the AP requires the user to have a key to communicate with it — all data sent to and from the AP are encrypted

Answer 21

Wired Equivalent Privacy (WEP)

Question 22

WEP security has a number of weaknesses; it is like using a __________

Answer 22

padlock

Question 23

With _________, every frame is encrypted using a key

Answer 23

WiFi Protected Access (WPA)

Question 24

The difference is that the WPA key is __________ than the WEP key and thus, harder to break

Answer 24

longer

Question 25

The newest, most secure type of WLAN security --- user logs in to a login server to obtain the master key

Answer 25

802.11i (WPA2)

Question 26

802.11i uses the ____________________ (AES) as its encryption method

Answer 26

Advanced Encryption Standard

Question 27

With ____________________, the AP permits the owner to provide a list of MAC addresses

Answer 27

MAC address filtering