Wireless Lan — Test 1

Correct Answer: A. A. Device that allows wireless devices to connect to a wired network
Explanation: Access point in a wireless network is any device that will allow the wireless devices to a wired network. A router is the best example of an Access Point.

Correct Answer: A. A. Access point is not required
Explanation: An ad-hoc wireless network is a decentralized kind of a wireless network. An access point is usually a central device and it would go against the rules of the ad-hoc network to use one. Hence it is not required.

Correct Answer: B. B. Csma/ca
Explanation: CSMA/CA stands for Carrier-sense multiple access/collision avoidance. It is a multiple access protocol used by IEEE 802.11 standard for wireless LAN. It’s based on the principle of collision avoidance by using different algorithms to avoid collisions between channels.

Correct Answer: A. A. Multiple access point are inter-connected with each other
Explanation: A Wireless Distribution System allows the connection of multiple access points together. It is used to expand a wireless network to a larger network.

Correct Answer: C. C. Both infrastructure mode and ad-hoc mode
Explanation: A wireless network interface controller works on the physical layer and the data link layer of the OSI model. Infrastructure mode WNIC needs access point but in ad-hoc mode access point is not required.

Correct Answer: A. A. Connected basic service sets
Explanation: The extended service set is a part of the IEEE 802.11 WLAN architecture and is used to expand the range of the basic service set by allowing connection of multiple basic service sets.

Correct Answer: B. B. Orthogonal frequency division multiplexing
Explanation: In orthogonal frequency division multiplexing, digital data is encoded on multiple carrier frequencies. It is also used in digital television and audio broadcasting in addition to Wireless LANs.

Correct Answer: A. A. Collision detection
Explanation: Collision detection is not possible in wireless LAN with no extensions. Collision detection techniques for multiple access like CSMA/CD are used to detect collisions in Wireless LANs.

Correct Answer: B. B. Security algorithm for wireless networks
Explanation: WEP is a security algorithm for wireless network which intended to provide data confidentiality comparable to that of traditional wired networks. It was introduced in 1997.

Correct Answer: A. A. Wi-fi protected access
Explanation: WPA or WiFi Protected Access is a security protocol used to provide users and firms with strong data security and protection for their wireless networks (WiFi) to give them confidence that only authorized users can access their network.