2b - WLANs

Question 1

A wireless computer network that links two or more devices using a wireless distribution method within a limited area;
Gives users the ability to remain connected to the network while they move around within a local coverage area.

Answer 1

WLAN

Question 2

CSMA/CA

Answer 2

A network contention protocol that listens to a network in order to avoid collisions.

Question 3

Difference between CSMA/CA and CSMA/CD

Answer 3

CSMA/CA avoids collisions and CSMA/CD deals with collision detection.

Question 4

Standard for CSMA/CA

Answer 4

IEEE 802.11

Question 5

802.11b

Answer 5

Has a maximum raw data of 11Mbit/s; Operates in the 2.4GHz range.
Direct extension of the 1997 standard and appeared on the market early 2000’s.

Question 6

802.11a

Answer 6

Operates in the 5GHz range; 54MBit/s
Less interference, but also less overall effective range than 2.4GHz band.

Question 7

802.11g

Answer 7

Operates in the 2.4GHz frequency band and uses the same transmission scheme as 802.11b;
Max 54Mbit/s

Question 8

802.11n

Answer 8

Adds MIMO antennas;
Operates in both 2.4 and 5 GHZ bands, with 54 - 600 Mbit/s

Question 9

802.11ac

Answer 9

The hyped up version of 802.11n; Includes MU-MIMO and link speeds that go all the way up to Gbps.

Question 10

IEEE 802.15.1

Answer 10

Bluetooth;
A wireless networking protocol for short-range networks.
Uses 2.4-2.85 GHz range.

Question 11

Advantages of wireless networks

Answer 11

Cost and mobility

Question 12

Disadvantages of wireless networks

Answer 12

Speed, Reliability, Security, and Reduced management control