Wi-Fi

Question 1
Which media access control protocol is used by IEEE 802.11 wireless LAN?
A
CDMA
B
CSMA/CA
C
ALOHA
D
None of the above
       Computer-Networks       Wi-Fi       ISRO-2017 May
Question 1 Explanation: 
This layer provides the same function as the MAC layer in the wired LAN environment. IEEE 802.11, instead of using Ethernet's CSMA/CD, specifies a scheme called CSMA/CA.
CA stands for Collision Avoidance. (In the wireless environment, since a station may not be able to hear all other stations, CD, Collision Detection is not feasible)
Question 2
What is WPA?
A
wired protected access
B
wi-fi protected access
C
wired process access
D
wi-fi process access
       Computer-Networks       Wi-Fi       ISRO-2017 May
Question 2 Explanation: 
→ WPA stands for Wi-Fi protected access. It is a security standard for computing devices equipped with wireless internet connection.
→ WPA provides data encryption and user authentication to the computing devices connected to a wi-fi network.
→ WPA also includes a Message Integrity Check, which is designed to prevent an attacker from altering and resending data packets. This replaces the cyclic redundancy check (CRC) that was used by the WEP standard.
Question 3
For the transmission of the signal, Bluetooth wireless technology uses
A
time division multiplexing
B
frequency division multiplexing
C
time division duplex
D
frequency division duplex
       Computer-Networks       Wi-Fi       UGC NET CS 2012 June-Paper2
Question 3 Explanation: 
→ Bluetooth wireless technology uses time division duplex.
→ Bluetooth uses less power and costs less to implement than Wi-Fi. Its lower power also makes it far less prone to suffering from or causing interference with other wireless devices in the same 2.4GHz radio band.
→ Bluetooth devices also shift radio frequencies often while paired, which prevents easy invasion.
There are 3 questions to complete.
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