Wireless LAN

Question 1

How many standards of Wireless LANS are there?

Answer 1

5

Question 2

What are the 5 standards of wireless LAN?

Answer 2

• 802.11a
• 802.11b
• 802.11g
• 802.11n
• 802.11ac

Question 3

What are the 3 ways wireless LAN can be configured?

Answer 3

– “Ad-hoc”
– Infrastructure/Access point
– Bridge mode

Question 4

What is Ad-hoc mode

Answer 4

Direct (peer-to-peer) communication between

devices. A gateway is required from at least one device to connect to external network

Question 5

What are the limitations with Ad-hoc mode?

Answer 5

-Ad-hoc mode is not very useful in a corporate environment
-It is nearly impossible to establish and manage an ad-hoc network with large numbers of
devices

Question 6

What is infrastructure/access point mode?

Answer 6

Joins a wireless network to a wired on via an wireless access point (think home network)

Question 7

What does a wireless access point provide?

Answer 7

– Centralised connection(s)
– Scalability
– Centralised security
– Improved coverage

Question 8

What does infrastructure/access mode allow?

Answer 8

Centralised management of the wireless network

Question 9

What must a device do in order to communicate on a wireless network?

Answer 9

Must “associate” with an access point

“Association” is the process of establishing
whether or not a particular device is allowed to
communicate on the wireless network

Question 10

What security precautions can a wireless access point be configured with?

Answer 10

– MAC Address verification
– SSID checking
– Encryption

Question 11

What is SSID checking?

Answer 11

SSID stands for Service Set Identifier and is
basically a network name. A device will only be allowed to join the wireless network if the SSID on the device matches the SSID on the access point and password if there is one.

Question 12

What does WEP stand for? and what are its issues?

Answer 12

Wired Equivalent Privacy. It has been found to contain a number of security flaws.

Question 13

What does WPA stand for?

Answer 13

Wireless protected access, there is now also WPA2

Question 14

What is bridge mode?

Answer 14

Bridge mode can be used to connect two separate parts of a network without the need for physical cabling

Question 15

What are the benefits of using a wireless network?

Answer 15

• Very quick and easy to setup
• Flexibility
• Lower cost of ownership
• Scalability

Question 16

What are the 3 main concerns with wireless security?

Answer 16

• There is no need to physically enter a location to attack a network
• Default configurations are often left unchanged
• Rogue access points

Question 17

What are the 2 strengths of WEP

Answer 17

64 or 128 bit

Question 18

What frequency does 802.11a operate at?

Answer 18

5GHZ

Question 19

What frequency do 802.11b and 802.11g operate at?

Answer 19

2.4GHZ

Question 20

What frequency do 802.11n and 802.11ac operate at?

Answer 20

5GHZ and 2.4GHZ

Question 21

What is a wireless security standard?

Answer 21

802.11i